[mod] migrate from Redis to Valkey (#4795)

This patch migrates from `redis==5.2.1` [1] to `valkey==6.1.0` [2].

The migration to valkey is necessary because the company behind Redis has decided
to abandon the open source license. After experiencing a drop in user numbers,
they now want to run it under a dual license again. But this move demonstrates
once again how unreliable the company is and how it treats open source
developers.

To review first, read the docs::

    $ make docs.live

Follow the instructions to remove redis:

- http://0.0.0.0:8000/admin/settings/settings_redis.html

Config and install a local valkey DB:

- http://0.0.0.0:8000/admin/settings/settings_valkey.html

[1] https://pypi.org/project/redis/
[2] https://pypi.org/project/valkey/

Co-authored-by: HLFH <gaspard@dhautefeuille.eu>
Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>

43 files changed, 467 insertions, 723 deletions

diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 9e5871918..e278a7a84 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,4 +1,4 @@
 FROM mcr.microsoft.com/devcontainers/base:debian
 
 RUN apt-get update && \
-    apt-get -y install python3 python3-venv redis firefox-esr graphviz imagemagick librsvg2-bin fonts-dejavu shellcheck
+    apt-get -y install python3 python3-venv valkey firefox-esr graphviz imagemagick librsvg2-bin fonts-dejavu shellcheck
diff --git a/Makefile b/Makefile
index 3071609ed..bd8c4442c 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,7 @@ test.shell:
 		utils/lib_go.sh \
 		utils/lib_nvm.sh \
 		utils/lib_redis.sh \
+		utils/lib_valkey.sh \
 		utils/searxng.sh \
 		utils/lxc.sh \
 		utils/lxc-searxng.env
diff --git a/docs/admin/arch_public.dot b/docs/admin/arch_public.dot
index 49b03d157..c131186d0 100644
--- a/docs/admin/arch_public.dot
+++ b/docs/admin/arch_public.dot
@@ -7,7 +7,8 @@ digraph G {
   rp      [label="reverse proxy"];
   static  [label="static files", shape=folder, href="url to configure static files", fillcolor=lightgray];
   uwsgi   [label="uwsgi", shape=parallelogram href="https://docs.searxng.org/utils/searxng.sh.html"]
-  redis     [label="redis DB", shape=cylinder];
+  valkey  [label="valkey DB", shape=cylinder];
+
   searxng1  [label="SearXNG #1", fontcolor=blue3];
   searxng2  [label="SearXNG #2", fontcolor=blue3];
   searxng3  [label="SearXNG #3", fontcolor=blue3];
@@ -21,10 +22,10 @@ digraph G {
       { rank=same; static rp };
       rp -> static  [label="optional: reverse proxy serves static files", fillcolor=slategray, fontcolor=slategray];
       rp -> uwsgi [label="http:// (tcp) or unix:// (socket)"];
-      uwsgi -> searxng1 -> redis;
-      uwsgi -> searxng2 -> redis;
-      uwsgi -> searxng3 -> redis;
-      uwsgi -> searxng4 -> redis;
+      uwsgi -> searxng1 -> valkey;
+      uwsgi -> searxng2 -> valkey;
+      uwsgi -> searxng3 -> valkey;
+      uwsgi -> searxng4 -> valkey;
   }
 
 }
diff --git a/docs/admin/installation-uwsgi.rst b/docs/admin/installation-uwsgi.rst
index 78da22f45..a2152409e 100644
--- a/docs/admin/installation-uwsgi.rst
+++ b/docs/admin/installation-uwsgi.rst
@@ -235,19 +235,19 @@ major release is from Dec. 2013, since the there had been only bugfix releases
   **In Tyrant mode, there is no way to get additional groups, and the uWSGI
   process misses additional permissions that may be needed.**
 
-For example on Fedora (RHEL): If you try to install a redis DB with socket
+For example on Fedora (RHEL): If you try to install a valkey DB with socket
 communication and you want to connect to it from the SearXNG uWSGI, you will see a
 *Permission denied* in the log of your instance::
 
-  ERROR:searx.redisdb: [searxng (993)] can't connect redis DB ...
-  ERROR:searx.redisdb:   Error 13 connecting to unix socket: /usr/local/searxng-redis/run/redis.sock. Permission denied.
+  ERROR:searx.valkeydb: [searxng (993)] can't connect valkey DB ...
+  ERROR:searx.valkeydb:   Error 13 connecting to unix socket: /usr/local/searxng-valkey/run/valkey.sock. Permission denied.
   ERROR:searx.plugins.limiter: init limiter DB failed!!!
 
 Even if your *searxng* user of the uWSGI process is added to additional groups
-to give access to the socket from the redis DB::
+to give access to the socket from the valkey DB::
 
   $ groups searxng
-  searxng : searxng searxng-redis
+  searxng : searxng searxng-valkey
 
 To see the effective groups of the uwsgi process, you have to look at the status
 of the process, by example::
@@ -257,7 +257,7 @@ of the process, by example::
   searxng      186      93  0 12:44 ?        00:00:01 /usr/sbin/uwsgi --ini searxng.ini
 
 Here you can see that the additional "Groups" of PID 186 are unset (missing gid
-of ``searxng-redis``)::
+of ``searxng-valkey``)::
 
   $ cat /proc/186/task/186/status
   ...
diff --git a/docs/admin/searx.limiter.rst b/docs/admin/searx.limiter.rst
index c23635571..6fac23868 100644
--- a/docs/admin/searx.limiter.rst
+++ b/docs/admin/searx.limiter.rst
@@ -6,7 +6,7 @@ Limiter
 
 .. sidebar:: info
 
-   The limiter requires a :ref:`Redis <settings redis>` database.
+   The limiter requires a :ref:`Valkey <settings valkey>` database.
 
 .. contents::
    :depth: 2
diff --git a/docs/admin/settings/index.rst b/docs/admin/settings/index.rst
index eb0e07a53..b9d0408ea 100644
--- a/docs/admin/settings/index.rst
+++ b/docs/admin/settings/index.rst
@@ -20,8 +20,7 @@ Settings
    settings_server
    settings_ui
    settings_redis
+   settings_valkey
    settings_outgoing
    settings_categories_as_tabs
    settings_plugins
-
-
diff --git a/docs/admin/settings/settings_redis.rst b/docs/admin/settings/settings_redis.rst
index 9fb067553..e1221ac32 100644
--- a/docs/admin/settings/settings_redis.rst
+++ b/docs/admin/settings/settings_redis.rst
@@ -4,46 +4,34 @@
 ``redis:``
 ==========
 
-.. _Redis.from_url(url): https://redis-py.readthedocs.io/en/stable/connections.html#redis.client.Redis.from_url
+.. _Valkey: https://valkey.io
 
-A redis DB can be connected by an URL, in :py:obj:`searx.redisdb` you
-will find a description to test your redis connection in SearXNG.  When using
-sockets, don't forget to check the access rights on the socket::
+.. attention::
 
-  ls -la /usr/local/searxng-redis/run/redis.sock
-  srwxrwx--- 1 searxng-redis searxng-redis ... /usr/local/searxng-redis/run/redis.sock
+   SearXNG is switching from the Redis DB to Valkey_. The configuration
+   description of Valkey_ in SearXNG can be found here: :ref:`settings
+   <settings valkey>`.
 
-In this example read/write access is given to the *searxng-redis* group.  To get
-access rights to redis instance (the socket), your SearXNG (or even your
-developer) account needs to be added to the *searxng-redis* group.
-
-``url`` : ``$SEARXNG_REDIS_URL``
-  URL to connect redis database, see `Redis.from_url(url)`_ & :ref:`redis db`::
-
-    redis://[[username]:[password]]@localhost:6379/0
-    rediss://[[username]:[password]]@localhost:6379/0
-    unix://[[username]:[password]]@/path/to/socket.sock?db=0
+If you have built and installed a local Redis DB for SearXNG, it is recommended
+to uninstall it now and replace it with the installation of a Valkey_ DB.
 
 .. _Redis Developer Notes:
 
 Redis Developer Notes
 =====================
 
-To set up a local redis instance, first set the socket path of the Redis DB
-in your YAML setting:
+To uninstall SearXNG's local Redis DB you can use:
 
-.. code:: yaml
+.. code:: sh
 
-   redis:
-     url: unix:///usr/local/searxng-redis/run/redis.sock?db=0
+   # stop your SearXNG instance
+   $ ./utils/searxng.sh remove.redis
 
-Then use the following commands to install the redis instance (:ref:`manage
-redis.help`):
+Remove the Redis DB in your YAML setting:
 
-.. code:: sh
+.. code:: yaml
 
-   $ ./manage redis.build
-   $ sudo -H ./manage redis.install
-   $ sudo -H ./manage redis.addgrp "${USER}"
-   # don't forget to logout & login to get member of group
+   redis:
+     url: unix:///usr/local/searxng-redis/run/redis.sock?db=0
 
+To install Valkey_ read: :ref:`Valkey Developer Notes`
diff --git a/docs/admin/settings/settings_server.rst b/docs/admin/settings/settings_server.rst
index 84908d43f..59c0d7791 100644
--- a/docs/admin/settings/settings_server.rst
+++ b/docs/admin/settings/settings_server.rst
@@ -36,7 +36,7 @@
 
 ``limiter`` :  ``$SEARXNG_LIMITER``
   Rate limit the number of request on the instance, block some bots.  The
-  :ref:`limiter` requires a :ref:`settings redis` database.
+  :ref:`limiter` requires a :ref:`settings valkey` database.
 
 .. _public_instance:
 
diff --git a/docs/admin/settings/settings_valkey.rst b/docs/admin/settings/settings_valkey.rst
new file mode 100644
index 000000000..396d5c8ad
--- /dev/null
+++ b/docs/admin/settings/settings_valkey.rst
@@ -0,0 +1,53 @@
+.. _settings valkey:
+
+===========
+``valkey:``
+===========
+
+.. _Valkey:
+    https://valkey.io
+.. _Valkey-Installation:
+    https://valkey.io/topics/installation/
+.. _There are several ways to specify a database number:
+    https://valkey-py.readthedocs.io/en/stable/connections.html#valkey.Valkey.from_url
+
+A Valkey_ DB can be connected by an URL, in section :ref:`valkey db` you will
+find a description to test your valkey connection in SearXNG.
+
+``url`` : ``$SEARXNG_VALKEY_URL``
+  URL to connect valkey database. `There are several ways to specify a database
+  number`_::
+
+    valkey://[[username]:[password]]@localhost:6379/0
+    valkeys://[[username]:[password]]@localhost:6379/0
+    unix://[[username]:[password]]@/path/to/socket.sock?db=0
+
+  When using sockets, don't forget to check the access rights on the socket::
+
+    ls -la /usr/local/searxng-valkey/run/valkey.sock
+    srwxrwx--- 1 searxng-valkey searxng-valkey ... /usr/local/searxng-valkey/run/valkey.sock
+
+  In this example read/write access is given to the *searxng-valkey* group.  To
+  get access rights to valkey instance (the socket), your SearXNG (or even your
+  developer) account needs to be added to the *searxng-valkey* group.
+
+
+.. _Valkey Developer Notes:
+
+Valkey Developer Notes
+======================
+
+To set up a local Valkey_ DB, set the URL connector in your YAML setting:
+
+.. code:: yaml
+
+   valkey:
+     url: valkey://localhost:6379/0
+
+To install a local Valkey_ DB from package manager read `Valkey-Installation`_
+or use:
+
+.. code:: sh
+
+   $ ./utils/searxng.sh install valkey
+   # restart your SearXNG instance
diff --git a/docs/admin/update-searxng.rst b/docs/admin/update-searxng.rst
index 16715f00d..d4a197603 100644
--- a/docs/admin/update-searxng.rst
+++ b/docs/admin/update-searxng.rst
@@ -56,7 +56,7 @@ SearXNG is growing rapidly, the services and opportunities are change every now
 and then, to name just a few:
 
 - Bot protection has been switched from filtron to SearXNG's :ref:`limiter
-  <limiter>`, this requires a :ref:`Redis <settings redis>` database.
+  <limiter>`, this requires a :ref:`Valkey <settings valkey>` database.
 
 - To save bandwidth :ref:`cache busting <static_use_hash>` has been implemented.
   To get in use, the ``static-expires`` needs to be set in the :ref:`uwsgi
@@ -89,5 +89,5 @@ to see if there are some left overs.  In this example there exists a *old*
    --------------
    ERROR: settings.yml in /etc/searx/ is deprecated, move file to folder /etc/searxng/
    ...
-   INFO    searx.redisdb                 : connecting to Redis db=0 path='/usr/local/searxng-redis/run/redis.sock'
-   INFO    searx.redisdb                 : connected to Redis
+   INFO    searx.valkeydb                 : connecting to Valkey db=0 path='/usr/local/searxng-valkey/run/valkey.sock'
+   INFO    searx.valkeydb                 : connected to Valkey
diff --git a/docs/conf.py b/docs/conf.py
index 468c160cb..a7221e48b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -149,7 +149,7 @@ intersphinx_mapping = {
     "jinja": ("https://jinja.palletsprojects.com/en/stable/", None),
     "linuxdoc" : ("https://return42.github.io/linuxdoc/", None),
     "sphinx" : ("https://www.sphinx-doc.org/en/master/", None),
-    "redis": ('https://redis.readthedocs.io/en/stable/', None),
+    "valkey": ('https://valkey-py.readthedocs.io/en/stable/', None),
 }
 
 issues_github_path = "searxng/searxng"
diff --git a/docs/dev/engines/offline/nosql-engines.rst b/docs/dev/engines/offline/nosql-engines.rst
index 76f5cfb61..551600c4e 100644
--- a/docs/dev/engines/offline/nosql-engines.rst
+++ b/docs/dev/engines/offline/nosql-engines.rst
@@ -7,7 +7,7 @@ NoSQL databases
 .. sidebar:: further read
 
    - `NoSQL databases <https://en.wikipedia.org/wiki/NoSQL>`_
-   - `redis.io <https://redis.io/>`_
+   - `valkey.io <https://valkey.io/>`_
    - `MongoDB <https://www.mongodb.com>`_
 
 .. contents::
@@ -22,7 +22,7 @@ NoSQL databases
 
 The following `NoSQL databases`_ are supported:
 
-- :ref:`engine redis_server`
+- :ref:`engine valkey_server`
 - :ref:`engine mongodb`
 
 All of the engines above are just commented out in the :origin:`settings.yml
@@ -45,7 +45,7 @@ section :ref:`private engines`.
 Extra Dependencies
 ==================
 
-For using :ref:`engine redis_server` or :ref:`engine mongodb` you need to
+For using :ref:`engine valkey_server` or :ref:`engine mongodb` you need to
 install additional packages in Python's Virtual Environment of your SearXNG
 instance.  To switch into the environment (:ref:`searxng-src`) you can use
 :ref:`searxng.sh`::
@@ -61,20 +61,20 @@ Configure the engines
 their structure.
 
 
-.. _engine redis_server:
+.. _engine valkey_server:
 
-Redis Server
-------------
+Valkey Server
+-------------
 
-.. _redis: https://github.com/andymccurdy/redis-py#installation
+.. _valkey: https://github.com/andymccurdy/valkey-py#installation
 
 .. sidebar:: info
 
-   - ``pip install`` redis_
-   - redis.io_
-   - :origin:`redis_server.py <searx/engines/redis_server.py>`
+   - ``pip install`` valkey_
+   - valkey.io_
+   - :origin:`valkey_server.py <searx/engines/valkey_server.py>`
 
-.. automodule:: searx.engines.redis_server
+.. automodule:: searx.engines.valkey_server
   :members:
 
 
@@ -94,4 +94,3 @@ MongoDB
 
 .. automodule:: searx.engines.mongodb
   :members:
-
diff --git a/docs/dev/lxcdev.rst b/docs/dev/lxcdev.rst
index 9edd9f672..22c16ff0d 100644
--- a/docs/dev/lxcdev.rst
+++ b/docs/dev/lxcdev.rst
@@ -140,7 +140,7 @@ proxy :ref:`installation nginx` into the archlinux container run:
 .. sidebar:: Fully functional SearXNG suite
 
    From here on you have a fully functional SearXNG suite (including a
-   :ref:`redis db`).
+   :ref:`valkey db`).
 
 In such a SearXNG suite admins can maintain and access the debug log of the
 services quite easy.
diff --git a/docs/dev/makefile.rst b/docs/dev/makefile.rst
index a66ce2f22..4781b2ce6 100644
--- a/docs/dev/makefile.rst
+++ b/docs/dev/makefile.rst
@@ -362,17 +362,6 @@ can be used to convenient run common build tasks of the static files.
 .. program-output:: bash -c "cd ..; ./manage static.help"
 
 
-.. _manage redis.help:
-
-``./manage redis.help``
-=======================
-
-The ``./manage redis.*`` command line can be used to convenient run common Redis
-tasks (:ref:`Redis developer notes`).
-
-.. program-output:: bash -c "cd ..; ./manage redis.help"
-
-
 .. _manage go.help:
 
 ``./manage go.help``
diff --git a/docs/src/searx.redisdb.rst b/docs/src/searx.redisdb.rst
deleted file mode 100644
index 625378c91..000000000
--- a/docs/src/searx.redisdb.rst
+++ /dev/null
@@ -1,8 +0,0 @@
-.. _redis db:
-
-========
-Redis DB
-========
-
-.. automodule:: searx.redisdb
-  :members:
diff --git a/docs/src/searx.redislib.rst b/docs/src/searx.redislib.rst
deleted file mode 100644
index b4604574c..000000000
--- a/docs/src/searx.redislib.rst
+++ /dev/null
@@ -1,8 +0,0 @@
-.. _searx.redis:
-
-=============
-Redis Library
-=============
-
-.. automodule:: searx.redislib
-  :members:
diff --git a/docs/src/searx.valkeydb.rst b/docs/src/searx.valkeydb.rst
new file mode 100644
index 000000000..165b88111
--- /dev/null
+++ b/docs/src/searx.valkeydb.rst
@@ -0,0 +1,8 @@
+.. _valkey db:
+
+==========
+Valkey DB
+==========
+
+.. automodule:: searx.valkeydb
+  :members:
diff --git a/docs/src/searx.valkeylib.rst b/docs/src/searx.valkeylib.rst
new file mode 100644
index 000000000..a0f935d2a
--- /dev/null
+++ b/docs/src/searx.valkeylib.rst
@@ -0,0 +1,8 @@
+.. _searx.valkey:
+
+==============
+Valkey Library
+==============
+
+.. automodule:: searx.valkeylib
+  :members:
diff --git a/manage b/manage
index ee2a29281..22f3ae821 100755
--- a/manage
+++ b/manage
@@ -35,8 +35,8 @@ source "$(dirname "${BASH_SOURCE[0]}")/utils/lib_sxng_test.sh"
 # shellcheck source=utils/lib_go.sh
 source "$(dirname "${BASH_SOURCE[0]}")/utils/lib_go.sh"
 
-# shellcheck source=utils/lib_redis.sh
-source "$(dirname "${BASH_SOURCE[0]}")/utils/lib_redis.sh"
+# shellcheck source=utils/lib_valkey.sh
+source "$(dirname "${BASH_SOURCE[0]}")/utils/lib_valkey.sh"
 
 # shellcheck source=utils/lib_sxng_vite.sh
 source "$(dirname "${BASH_SOURCE[0]}")/utils/lib_sxng_vite.sh"
@@ -52,12 +52,6 @@ GECKODRIVER_VERSION="v0.35.0"
 BLACK_OPTIONS=("--target-version" "py311" "--line-length" "120" "--skip-string-normalization")
 BLACK_TARGETS=("--exclude" "(searx/static|searx/languages.py)" "--include" 'searxng.msg|\.pyi?$' "searx" "searxng_extra" "tests")
 
-_dev_redis_sock="/usr/local/searxng-redis/run/redis.sock"
-# set SEARXNG_REDIS_URL if it is not defined and "{_dev_redis_sock}" exists.
-if [ -S "${_dev_redis_sock}" ] && [ -z "${SEARXNG_REDIS_URL}" ]; then
-    export SEARXNG_REDIS_URL="unix://${_dev_redis_sock}?db=0"
-fi
-
 YAMLLINT_FILES=()
 while IFS= read -r line; do
     if [ "$line" != "tests/unit/settings/syntaxerror_settings.yml" ]; then
@@ -83,10 +77,8 @@ docs.:
 gecko.driver:
   download & install geckodriver if not already installed (required for
   robot_tests)
-redis:
-  build     : build redis binaries at $(redis._get_dist)
-  install   : create user (${REDIS_USER}) and install systemd service (${REDIS_SERVICE_NAME})
-  help      : show more redis commands
+valkey:
+  install   : create user (${VALKEY_USER}) and install systemd service (${VALKEY_SERVICE_NAME})
 py.:
   build     : Build python packages at ./${PYDIST}
   clean     : delete virtualenv and intermediate py files
@@ -109,7 +101,7 @@ EOF
     vite.help
     cat <<EOF
 environment ...
-  SEARXNG_REDIS_URL : ${SEARXNG_REDIS_URL}
+  SEARXNG_VALKEY_URL : ${SEARXNG_VALKEY_URL}
 EOF
 }
 
diff --git a/requirements.txt b/requirements.txt
index f6601748b..732958a0c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ httpx-socks[asyncio]==0.10.0
 Brotli==1.1.0
 uvloop==0.21.0
 setproctitle==1.3.6
-redis==5.2.1
+valkey==6.1.0
 markdown-it-py==3.0.0
 fasttext-predict==0.9.2.4
 tomli==2.2.1; python_version < '3.11'
diff --git a/searx/botdetection/__init__.py b/searx/botdetection/__init__.py
index 51f437cf0..4079d97a9 100644
--- a/searx/botdetection/__init__.py
+++ b/searx/botdetection/__init__.py
@@ -12,11 +12,11 @@ from ._helpers import too_many_requests
 
 __all__ = ['dump_request', 'get_network', 'get_real_ip', 'too_many_requests']
 
-redis_client = None
+valkey_client = None
 cfg = None
 
 
-def init(_cfg, _redis_client):
-    global redis_client, cfg  # pylint: disable=global-statement
-    redis_client = _redis_client
+def init(_cfg, _valkey_client):
+    global valkey_client, cfg  # pylint: disable=global-statement
+    valkey_client = _valkey_client
     cfg = _cfg
diff --git a/searx/botdetection/ip_limit.py b/searx/botdetection/ip_limit.py
index 161a9826e..93af8b7c5 100644
--- a/searx/botdetection/ip_limit.py
+++ b/searx/botdetection/ip_limit.py
@@ -6,8 +6,8 @@ Method ``ip_limit``
 
 The ``ip_limit`` method counts request from an IP in *sliding windows*.  If
 there are to many requests in a sliding window, the request is evaluated as a
-bot request.  This method requires a redis DB and needs a HTTP X-Forwarded-For_
-header.  To take privacy only the hash value of an IP is stored in the redis DB
+bot request.  This method requires a valkey DB and needs a HTTP X-Forwarded-For_
+header.  To take privacy only the hash value of an IP is stored in the valkey DB
 and at least for a maximum of 10 minutes.
 
 The :py:obj:`.link_token` method can be used to investigate whether a request is
@@ -46,8 +46,8 @@ import flask
 import werkzeug
 
 from searx.extended_types import SXNG_Request
-from searx import redisdb
-from searx.redislib import incr_sliding_window, drop_counter
+from searx import valkeydb
+from searx.valkeylib import incr_sliding_window, drop_counter
 
 from . import link_token
 from . import config
@@ -97,14 +97,14 @@ def filter_request(
 ) -> werkzeug.Response | None:
 
     # pylint: disable=too-many-return-statements
-    redis_client = redisdb.client()
+    valkey_client = valkeydb.client()
 
     if network.is_link_local and not cfg['botdetection.ip_limit.filter_link_local']:
         logger.debug("network %s is link-local -> not monitored by ip_limit method", network.compressed)
         return None
 
     if request.args.get('format', 'html') != 'html':
-        c = incr_sliding_window(redis_client, 'ip_limit.API_WINDOW:' + network.compressed, API_WINDOW)
+        c = incr_sliding_window(valkey_client, 'ip_limit.API_WINDOW:' + network.compressed, API_WINDOW)
         if c > API_MAX:
             return too_many_requests(network, "too many request in API_WINDOW")
 
@@ -114,12 +114,12 @@ def filter_request(
 
         if not suspicious:
             # this IP is no longer suspicious: release ip again / delete the counter of this IP
-            drop_counter(redis_client, 'ip_limit.SUSPICIOUS_IP_WINDOW' + network.compressed)
+            drop_counter(valkey_client, 'ip_limit.SUSPICIOUS_IP_WINDOW' + network.compressed)
             return None
 
         # this IP is suspicious: count requests from this IP
         c = incr_sliding_window(
-            redis_client, 'ip_limit.SUSPICIOUS_IP_WINDOW' + network.compressed, SUSPICIOUS_IP_WINDOW
+            valkey_client, 'ip_limit.SUSPICIOUS_IP_WINDOW' + network.compressed, SUSPICIOUS_IP_WINDOW
         )
         if c > SUSPICIOUS_IP_MAX:
             logger.error("BLOCK: too many request from %s in SUSPICIOUS_IP_WINDOW (redirect to /)", network)
@@ -127,22 +127,22 @@ def filter_request(
             response.headers["Cache-Control"] = "no-store, max-age=0"
             return response
 
-        c = incr_sliding_window(redis_client, 'ip_limit.BURST_WINDOW' + network.compressed, BURST_WINDOW)
+        c = incr_sliding_window(valkey_client, 'ip_limit.BURST_WINDOW' + network.compressed, BURST_WINDOW)
         if c > BURST_MAX_SUSPICIOUS:
             return too_many_requests(network, "too many request in BURST_WINDOW (BURST_MAX_SUSPICIOUS)")
 
-        c = incr_sliding_window(redis_client, 'ip_limit.LONG_WINDOW' + network.compressed, LONG_WINDOW)
+        c = incr_sliding_window(valkey_client, 'ip_limit.LONG_WINDOW' + network.compressed, LONG_WINDOW)
         if c > LONG_MAX_SUSPICIOUS:
             return too_many_requests(network, "too many request in LONG_WINDOW (LONG_MAX_SUSPICIOUS)")
 
         return None
 
     # vanilla limiter without extensions counts BURST_MAX and LONG_MAX
-    c = incr_sliding_window(redis_client, 'ip_limit.BURST_WINDOW' + network.compressed, BURST_WINDOW)
+    c = incr_sliding_window(valkey_client, 'ip_limit.BURST_WINDOW' + network.compressed, BURST_WINDOW)
     if c > BURST_MAX:
         return too_many_requests(network, "too many request in BURST_WINDOW (BURST_MAX)")
 
-    c = incr_sliding_window(redis_client, 'ip_limit.LONG_WINDOW' + network.compressed, LONG_WINDOW)
+    c = incr_sliding_window(valkey_client, 'ip_limit.LONG_WINDOW' + network.compressed, LONG_WINDOW)
     if c > LONG_MAX:
         return too_many_requests(network, "too many request in LONG_WINDOW (LONG_MAX)")
 
diff --git a/searx/botdetection/link_token.py b/searx/botdetection/link_token.py
index c255790cb..600796380 100644
--- a/searx/botdetection/link_token.py
+++ b/searx/botdetection/link_token.py
@@ -10,7 +10,7 @@ a ping by request a static URL.
 
 .. note::
 
-   This method requires a redis DB and needs a HTTP X-Forwarded-For_ header.
+   This method requires a valkey DB and needs a HTTP X-Forwarded-For_ header.
 
 To get in use of this method a flask URL route needs to be added:
 
@@ -45,8 +45,8 @@ import string
 import random
 
 from searx import logger
-from searx import redisdb
-from searx.redislib import secret_hash
+from searx import valkeydb
+from searx.valkeylib import secret_hash
 from searx.extended_types import SXNG_Request
 
 from ._helpers import (
@@ -76,17 +76,17 @@ def is_suspicious(network: IPv4Network | IPv6Network, request: SXNG_Request, ren
     :py:obj:`PING_LIVE_TIME`.
 
     """
-    redis_client = redisdb.client()
-    if not redis_client:
+    valkey_client = valkeydb.client()
+    if not valkey_client:
         return False
 
     ping_key = get_ping_key(network, request)
-    if not redis_client.get(ping_key):
+    if not valkey_client.get(ping_key):
         logger.info("missing ping (IP: %s) / request: %s", network.compressed, ping_key)
         return True
 
     if renew:
-        redis_client.set(ping_key, 1, ex=PING_LIVE_TIME)
+        valkey_client.set(ping_key, 1, ex=PING_LIVE_TIME)
 
     logger.debug("found ping for (client) network %s -> %s", network.compressed, ping_key)
     return False
@@ -98,9 +98,9 @@ def ping(request: SXNG_Request, token: str):
     The expire time of this ping-key is :py:obj:`PING_LIVE_TIME`.
 
     """
-    from . import redis_client, cfg  # pylint: disable=import-outside-toplevel, cyclic-import
+    from . import valkey_client, cfg  # pylint: disable=import-outside-toplevel, cyclic-import
 
-    if not redis_client:
+    if not valkey_client:
         return
     if not token_is_valid(token):
         return
@@ -110,7 +110,7 @@ def ping(request: SXNG_Request, token: str):
 
     ping_key = get_ping_key(network, request)
     logger.debug("store ping_key for (client) network %s (IP %s) -> %s", network.compressed, real_ip, ping_key)
-    redis_client.set(ping_key, 1, ex=PING_LIVE_TIME)
+    valkey_client.set(ping_key, 1, ex=PING_LIVE_TIME)
 
 
 def get_ping_key(network: IPv4Network | IPv6Network, request: SXNG_Request) -> str:
@@ -134,21 +134,21 @@ def token_is_valid(token) -> bool:
 
 def get_token() -> str:
     """Returns current token.  If there is no currently active token a new token
-    is generated randomly and stored in the redis DB.
+    is generated randomly and stored in the valkey DB.
 
     - :py:obj:`TOKEN_LIVE_TIME`
     - :py:obj:`TOKEN_KEY`
 
     """
-    redis_client = redisdb.client()
-    if not redis_client:
-        # This function is also called when limiter is inactive / no redis DB
+    valkey_client = valkeydb.client()
+    if not valkey_client:
+        # This function is also called when limiter is inactive / no valkey DB
         # (see render function in webapp.py)
         return '12345678'
-    token = redis_client.get(TOKEN_KEY)
+    token = valkey_client.get(TOKEN_KEY)
     if token:
         token = token.decode('UTF-8')
     else:
         token = ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(16))
-        redis_client.set(TOKEN_KEY, token, ex=TOKEN_LIVE_TIME)
+        valkey_client.set(TOKEN_KEY, token, ex=TOKEN_LIVE_TIME)
     return token
diff --git a/searx/engines/redis_server.py b/searx/engines/valkey_server.py
index eebb5809b..b2d3dd26f 100644
--- a/searx/engines/redis_server.py
+++ b/searx/engines/valkey_server.py
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""Redis is an open source (BSD licensed), in-memory data structure (key value
-based) store.  Before configuring the ``redis_server`` engine, you must install
-the dependency redis_.
+"""Valkey is an open source (BSD licensed), in-memory data structure (key value
+based) store.  Before configuring the ``valkey_server`` engine, you must install
+the dependency valkey_.
 
 Configuration
 =============
@@ -17,11 +17,11 @@ Below is an example configuration:
 
 .. code:: yaml
 
-  # Required dependency: redis
+  # Required dependency: valkey
 
-  - name: myredis
+  - name: myvalkey
     shortcut : rds
-    engine: redis_server
+    engine: valkey_server
     exact_match_only: false
     host: '127.0.0.1'
     port: 6379
@@ -34,13 +34,13 @@ Implementations
 
 """
 
-import redis  # pylint: disable=import-error
+import valkey  # pylint: disable=import-error
 
 from searx.result_types import EngineResults
 
 engine_type = 'offline'
 
-# redis connection variables
+# valkey connection variables
 host = '127.0.0.1'
 port = 6379
 password = ''
@@ -50,12 +50,12 @@ db = 0
 paging = False
 exact_match_only = True
 
-_redis_client = None
+_valkey_client = None
 
 
 def init(_engine_settings):
-    global _redis_client  # pylint: disable=global-statement
-    _redis_client = redis.StrictRedis(
+    global _valkey_client  # pylint: disable=global-statement
+    _valkey_client = valkey.StrictValkey(
         host=host,
         port=port,
         db=db,
@@ -72,28 +72,28 @@ def search(query, _params) -> EngineResults:
             res.add(res.types.KeyValue(kvmap=kvmap))
         return res
 
-    kvmap: dict[str, str] = _redis_client.hgetall(query)
+    kvmap: dict[str, str] = _valkey_client.hgetall(query)
     if kvmap:
         res.add(res.types.KeyValue(kvmap=kvmap))
     elif " " in query:
         qset, rest = query.split(" ", 1)
-        for row in _redis_client.hscan_iter(qset, match='*{}*'.format(rest)):
+        for row in _valkey_client.hscan_iter(qset, match='*{}*'.format(rest)):
             res.add(res.types.KeyValue(kvmap={row[0]: row[1]}))
     return res
 
 
 def search_keys(query) -> list[dict]:
     ret = []
-    for key in _redis_client.scan_iter(match='*{}*'.format(query)):
-        key_type = _redis_client.type(key)
+    for key in _valkey_client.scan_iter(match='*{}*'.format(query)):
+        key_type = _valkey_client.type(key)
         res = None
 
         if key_type == 'hash':
-            res = _redis_client.hgetall(key)
+            res = _valkey_client.hgetall(key)
         elif key_type == 'list':
-            res = dict(enumerate(_redis_client.lrange(key, 0, -1)))
+            res = dict(enumerate(_valkey_client.lrange(key, 0, -1)))
 
         if res:
-            res['redis_key'] = key
+            res['valkey_key'] = key
             ret.append(res)
     return ret
diff --git a/searx/limiter.py b/searx/limiter.py
index 92b38c68f..99bc338d1 100644
--- a/searx/limiter.py
+++ b/searx/limiter.py
@@ -17,7 +17,7 @@ from the :ref:`botdetection`:
   the time.
 
 - Detection & dynamically :ref:`botdetection rate limit` of bots based on the
-  behavior of the requests.  For dynamically changeable IP lists a Redis
+  behavior of the requests.  For dynamically changeable IP lists a Valkey
   database is needed.
 
 The prerequisite for IP based methods is the correct determination of the IP of
@@ -50,13 +50,13 @@ To enable the limiter activate:
      ...
      limiter: true  # rate limit the number of request on the instance, block some bots
 
-and set the redis-url connection. Check the value, it depends on your redis DB
-(see :ref:`settings redis`), by example:
+and set the valkey-url connection. Check the value, it depends on your valkey DB
+(see :ref:`settings valkey`), by example:
 
 .. code:: yaml
 
-   redis:
-     url: unix:///usr/local/searxng-redis/run/redis.sock?db=0
+   valkey:
+     url: valkey://localhost:6379/0
 
 
 Configure Limiter
@@ -102,7 +102,7 @@ import werkzeug
 
 from searx import (
     logger,
-    redisdb,
+    valkeydb,
 )
 from searx import botdetection
 from searx.extended_types import SXNG_Request, sxng_request
@@ -217,7 +217,7 @@ def pre_request():
 
 
 def is_installed():
-    """Returns ``True`` if limiter is active and a redis DB is available."""
+    """Returns ``True`` if limiter is active and a valkey DB is available."""
     return _INSTALLED
 
 
@@ -229,15 +229,15 @@ def initialize(app: flask.Flask, settings):
     # (e.g. the self_info plugin uses the botdetection to get client IP)
 
     cfg = get_cfg()
-    redis_client = redisdb.client()
-    botdetection.init(cfg, redis_client)
+    valkey_client = valkeydb.client()
+    botdetection.init(cfg, valkey_client)
 
     if not (settings['server']['limiter'] or settings['server']['public_instance']):
         return
 
-    if not redis_client:
+    if not valkey_client:
         logger.error(
-            "The limiter requires Redis, please consult the documentation: "
+            "The limiter requires Valkey, please consult the documentation: "
             "https://docs.searxng.org/admin/searx.limiter.html"
         )
         if settings['server']['public_instance']:
diff --git a/searx/redisdb.py b/searx/redisdb.py
deleted file mode 100644
index bed0c347b..000000000
--- a/searx/redisdb.py
+++ /dev/null
@@ -1,69 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""Implementation of the redis client (redis-py_).
-
-.. _redis-py: https://github.com/redis/redis-py
-
-This implementation uses the :ref:`settings redis` setup from ``settings.yml``.
-A redis DB connect can be tested by::
-
-  >>> from searx import redisdb
-  >>> redisdb.initialize()
-  True
-  >>> db = redisdb.client()
-  >>> db.set("foo", "bar")
-  True
-  >>> db.get("foo")
-  b'bar'
-  >>>
-
-"""
-
-import os
-import pwd
-import logging
-import redis
-from searx import get_setting
-
-
-OLD_REDIS_URL_DEFAULT_URL = 'unix:///usr/local/searxng-redis/run/redis.sock?db=0'
-"""This was the default Redis URL in settings.yml."""
-
-_CLIENT = None
-logger = logging.getLogger(__name__)
-
-
-def client() -> redis.Redis:
-    return _CLIENT
-
-
-def initialize():
-    global _CLIENT  # pylint: disable=global-statement
-    redis_url = get_setting('redis.url')
-    if not redis_url:
-        return False
-    try:
-        # create a client, but no connection is done
-        _CLIENT = redis.Redis.from_url(redis_url)
-
-        # log the parameters as seen by the redis lib, without the password
-        kwargs = _CLIENT.get_connection_kwargs().copy()
-        kwargs.pop('password', None)
-        kwargs = ' '.join([f'{k}={v!r}' for k, v in kwargs.items()])
-        logger.info("connecting to Redis %s", kwargs)
-
-        # check the connection
-        _CLIENT.ping()
-
-        # no error: the redis connection is working
-        logger.info("connected to Redis")
-        return True
-    except redis.exceptions.RedisError as e:
-        _CLIENT = None
-        _pw = pwd.getpwuid(os.getuid())
-        logger.exception("[%s (%s)] can't connect redis DB ...", _pw.pw_name, _pw.pw_uid)
-        if redis_url == OLD_REDIS_URL_DEFAULT_URL and isinstance(e, redis.exceptions.ConnectionError):
-            logger.info(
-                "You can safely ignore the above Redis error if you don't use Redis. "
-                "You can remove this error by setting redis.url to false in your settings.yml."
-            )
-    return False
diff --git a/searx/search/checker/background.py b/searx/search/checker/background.py
index 7333e6ad0..1890c77d5 100644
--- a/searx/search/checker/background.py
+++ b/searx/search/checker/background.py
@@ -8,18 +8,18 @@ import os
 import signal
 from typing import Any, Dict, List, Literal, Optional, Tuple, TypedDict, Union
 
-import redis.exceptions
+import valkey.exceptions
 
 from searx import logger, settings, sxng_debug
-from searx.redisdb import client as get_redis_client
+from searx.valkeydb import client as get_valkey_client
 from searx.exceptions import SearxSettingsException
 from searx.search.processors import PROCESSORS
 from searx.search.checker import Checker
 from searx.search.checker.scheduler import scheduler_function
 
 
-REDIS_RESULT_KEY = 'SearXNG_checker_result'
-REDIS_LOCK_KEY = 'SearXNG_checker_lock'
+VALKEY_RESULT_KEY = 'SearXNG_checker_result'
+VALKEY_LOCK_KEY = 'SearXNG_checker_lock'
 
 
 CheckerResult = Union['CheckerOk', 'CheckerErr', 'CheckerOther']
@@ -77,23 +77,23 @@ def _get_interval(every: Any, error_msg: str) -> Tuple[int, int]:
 
 
 def get_result() -> CheckerResult:
-    client = get_redis_client()
+    client = get_valkey_client()
     if client is None:
-        # without Redis, the checker is disabled
+        # without Valkey, the checker is disabled
         return {'status': 'disabled'}
-    serialized_result: Optional[bytes] = client.get(REDIS_RESULT_KEY)
+    serialized_result: Optional[bytes] = client.get(VALKEY_RESULT_KEY)
     if serialized_result is None:
-        # the Redis key does not exist
+        # the Valkey key does not exist
         return {'status': 'unknown'}
     return json.loads(serialized_result)
 
 
 def _set_result(result: CheckerResult):
-    client = get_redis_client()
+    client = get_valkey_client()
     if client is None:
-        # without Redis, the function does nothing
+        # without Valkey, the function does nothing
         return
-    client.set(REDIS_RESULT_KEY, json.dumps(result))
+    client.set(VALKEY_RESULT_KEY, json.dumps(result))
 
 
 def _timestamp():
@@ -102,9 +102,9 @@ def _timestamp():
 
 def run():
     try:
-        # use a Redis lock to make sure there is no checker running at the same time
+        # use a Valkey lock to make sure there is no checker running at the same time
         # (this should not happen, this is a safety measure)
-        with get_redis_client().lock(REDIS_LOCK_KEY, blocking_timeout=60, timeout=3600):
+        with get_valkey_client().lock(VALKEY_LOCK_KEY, blocking_timeout=60, timeout=3600):
             logger.info('Starting checker')
             result: CheckerOk = {'status': 'ok', 'engines': {}, 'timestamp': _timestamp()}
             for name, processor in PROCESSORS.items():
@@ -118,7 +118,7 @@ def run():
 
             _set_result(result)
             logger.info('Check done')
-    except redis.exceptions.LockError:
+    except valkey.exceptions.LockError:
         _set_result({'status': 'error', 'timestamp': _timestamp()})
         logger.exception('Error while running the checker')
     except Exception:  # pylint: disable=broad-except
@@ -149,9 +149,9 @@ def initialize():
         logger.info('Checker scheduler is disabled')
         return
 
-    # make sure there is a Redis connection
-    if get_redis_client() is None:
-        logger.error('The checker requires Redis')
+    # make sure there is a Valkey connection
+    if get_valkey_client() is None:
+        logger.error('The checker requires Valkey')
         return
 
     # start the background scheduler
diff --git a/searx/search/checker/scheduler.lua b/searx/search/checker/scheduler.lua
index 0de9b404d..ec318ddd6 100644
--- a/searx/search/checker/scheduler.lua
+++ b/searx/search/checker/scheduler.lua
@@ -2,9 +2,9 @@
 --
 -- This script is not a string in scheduler.py, so editors can provide syntax highlighting.
 
--- The Redis KEY is defined here and not in Python on purpose:
+-- The Valkey KEY is defined here and not in Python on purpose:
 -- only this LUA script can read and update this key to avoid lock and concurrency issues.
-local redis_key = 'SearXNG_checker_next_call_ts'
+local valkey_key = 'SearXNG_checker_next_call_ts'
 
 local now = redis.call('TIME')[1]
 local start_after_from = ARGV[1]
@@ -12,14 +12,14 @@ local start_after_to = ARGV[2]
 local every_from = ARGV[3]
 local every_to = ARGV[4]
 
-local next_call_ts = redis.call('GET', redis_key)
+local next_call_ts = redis.call('GET', valkey_key)
 
 if (next_call_ts == false or next_call_ts == nil) then
-    -- the scheduler has never run on this Redis instance, so:
+    -- the scheduler has never run on this Valkey instance, so:
     -- 1/ the scheduler does not run now
     -- 2/ the next call is a random time between start_after_from and start_after_to
     local initial_delay = math.random(start_after_from, start_after_to)
-    redis.call('SET', redis_key, now + initial_delay)
+    redis.call('SET', valkey_key, now + initial_delay)
     return { false, initial_delay }
 end
 
@@ -31,6 +31,6 @@ if call_now then
     -- the checker runs now, define the timestamp of the next call:
     -- this is a random delay between every_from and every_to
     local periodic_delay = math.random(every_from, every_to)
-    next_call_ts = redis.call('INCRBY', redis_key, periodic_delay)
+    next_call_ts = redis.call('INCRBY', valkey_key, periodic_delay)
 end
 return { call_now, next_call_ts - now }
diff --git a/searx/search/checker/scheduler.py b/searx/search/checker/scheduler.py
index c0d3f799a..b093a9ab7 100644
--- a/searx/search/checker/scheduler.py
+++ b/searx/search/checker/scheduler.py
@@ -1,11 +1,11 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # pylint: disable=missing-module-docstring
-"""Lame scheduler which use Redis as a source of truth:
-* the Redis key SearXNG_checker_next_call_ts contains the next time the embedded checker should run.
-* to avoid lock, a unique Redis script reads and updates the Redis key SearXNG_checker_next_call_ts.
-* this Redis script returns a list of two elements:
+"""Lame scheduler which use Valkey as a source of truth:
+* the Valkey key SearXNG_checker_next_call_ts contains the next time the embedded checker should run.
+* to avoid lock, a unique Valkey script reads and updates the Valkey key SearXNG_checker_next_call_ts.
+* this Valkey script returns a list of two elements:
    * the first one is a boolean. If True, the embedded checker must run now in this worker.
-   * the second element is the delay in second to wait before the next call to the Redis script.
+   * the second element is the delay in second to wait before the next call to the Valkey script.
 
 This scheduler is not generic on purpose: if more feature are required, a dedicate scheduler must be used
 (= a better scheduler should not use the web workers)
@@ -16,8 +16,8 @@ import time
 from pathlib import Path
 from typing import Callable
 
-from searx.redisdb import client as get_redis_client
-from searx.redislib import lua_script_storage
+from searx.valkeydb import client as get_valkey_client
+from searx.valkeylib import lua_script_storage
 
 
 logger = logging.getLogger('searx.search.checker')
@@ -29,7 +29,7 @@ def scheduler_function(start_after_from: int, start_after_to: int, every_from: i
     """Run the checker periodically. The function never returns.
 
     Parameters:
-    * start_after_from and start_after_to: when to call "callback" for the first on the Redis instance
+    * start_after_from and start_after_to: when to call "callback" for the first on the Valkey instance
     * every_from and every_to: after the first call, how often to call "callback"
 
     There is no issue:
@@ -38,11 +38,11 @@ def scheduler_function(start_after_from: int, start_after_to: int, every_from: i
     """
     scheduler_now_script = SCHEDULER_LUA.open().read()
     while True:
-        # ask the Redis script what to do
+        # ask the Valkey script what to do
         # the script says
         # * if the checker must run now.
         # * how to long to way before calling the script again (it can be call earlier, but not later).
-        script = lua_script_storage(get_redis_client(), scheduler_now_script)
+        script = lua_script_storage(get_valkey_client(), scheduler_now_script)
         call_now, wait_time = script(args=[start_after_from, start_after_to, every_from, every_to])
 
         # does the worker run the checker now?
diff --git a/searx/settings.yml b/searx/settings.yml
index cb7504efe..fb85f0ff4 100644
--- a/searx/settings.yml
+++ b/searx/settings.yml
@@ -110,9 +110,10 @@ server:
     X-Robots-Tag: noindex, nofollow
     Referrer-Policy: no-referrer
 
-redis:
-  # URL to connect redis database. Is overwritten by ${SEARXNG_REDIS_URL}.
-  # https://docs.searxng.org/admin/settings/settings_redis.html#settings-redis
+valkey:
+  # URL to connect valkey database. Is overwritten by ${SEARXNG_VALKEY_URL}.
+  # https://docs.searxng.org/admin/settings/settings_valkey.html#settings-valkey
+  # url: valkey://localhost:6379/0
   url: false
 
 ui:
@@ -1809,10 +1810,10 @@ engines:
     shortcut: rt
     disabled: true
 
-  # Required dependency: redis
-  # - name: myredis
+  # Required dependency: valkey
+  # - name: myvalkey
   #   shortcut : rds
-  #   engine: redis_server
+  #   engine: valkey_server
   #   exact_match_only: false
   #   host: '127.0.0.1'
   #   port: 6379
diff --git a/searx/settings_defaults.py b/searx/settings_defaults.py
index 4cee7e345..7e785e4d2 100644
--- a/searx/settings_defaults.py
+++ b/searx/settings_defaults.py
@@ -185,9 +185,13 @@ SCHEMA = {
         'method': SettingsValue(('POST', 'GET'), 'POST', 'SEARXNG_METHOD'),
         'default_http_headers': SettingsValue(dict, {}),
     },
+    # redis is deprecated ..
     'redis': {
         'url': SettingsValue((None, False, str), False, 'SEARXNG_REDIS_URL'),
     },
+    'valkey': {
+        'url': SettingsValue((None, False, str), False, 'SEARXNG_VALKEY_URL'),
+    },
     'ui': {
         'static_path': SettingsDirectoryValue(str, os.path.join(searx_dir, 'static')),
         'static_use_hash': SettingsValue(bool, False, 'SEARXNG_STATIC_USE_HASH'),
diff --git a/searx/valkeydb.py b/searx/valkeydb.py
new file mode 100644
index 000000000..2817c6d0a
--- /dev/null
+++ b/searx/valkeydb.py
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""Implementation of the valkey client (valkey-py_).
+
+.. _valkey-py: https://github.com/valkey-io/valkey-py
+
+This implementation uses the :ref:`settings valkey` setup from ``settings.yml``.
+A valkey DB connect can be tested by::
+
+  >>> from searx import valkeydb
+  >>> valkeydb.initialize()
+  True
+  >>> db = valkeydb.client()
+  >>> db.set("foo", "bar")
+  True
+  >>> db.get("foo")
+  b'bar'
+  >>>
+
+"""
+
+import os
+import pwd
+import logging
+import warnings
+
+import valkey
+from searx import get_setting
+
+
+_CLIENT = None
+logger = logging.getLogger(__name__)
+
+
+def client() -> valkey.Valkey:
+    return _CLIENT
+
+
+def initialize():
+    global _CLIENT  # pylint: disable=global-statement
+    if get_setting('redis.url'):
+        warnings.warn("setting redis.url is deprecated, use valkey.url", DeprecationWarning)
+    valkey_url = get_setting('valkey.url') or get_setting('redis.url')
+    if not valkey_url:
+        return False
+    try:
+        # create a client, but no connection is done
+        _CLIENT = valkey.Valkey.from_url(valkey_url)
+
+        # log the parameters as seen by the valkey lib, without the password
+        kwargs = _CLIENT.get_connection_kwargs().copy()
+        kwargs.pop('password', None)
+        kwargs = ' '.join([f'{k}={v!r}' for k, v in kwargs.items()])
+        logger.info("connecting to Valkey %s", kwargs)
+
+        # check the connection
+        _CLIENT.ping()
+
+        # no error: the valkey connection is working
+        logger.info("connected to Valkey")
+        return True
+    except valkey.exceptions.ValkeyError:
+        _CLIENT = None
+        _pw = pwd.getpwuid(os.getuid())
+        logger.exception("[%s (%s)] can't connect valkey DB ...", _pw.pw_name, _pw.pw_uid)
+    return False
diff --git a/searx/redislib.py b/searx/valkeylib.py
index 5fa8f2dae..733988eb1 100644
--- a/searx/redislib.py
+++ b/searx/valkeylib.py
@@ -1,10 +1,10 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""A collection of convenient functions and redis/lua scripts.
+"""A collection of convenient functions and valkey/lua scripts.
 
-This code was partial inspired by the `Bullet-Proofing Lua Scripts in RedisPy`_
+This code was partial inspired by the `Bullet-Proofing Lua Scripts in ValkeyPy`_
 article.
 
-.. _Bullet-Proofing Lua Scripts in RedisPy:
+.. _Bullet-Proofing Lua Scripts in ValkeyPy:
    https://redis.com/blog/bullet-proofing-lua-scripts-in-redispy/
 
 """
@@ -19,8 +19,8 @@ LUA_SCRIPT_STORAGE = {}
 
 
 def lua_script_storage(client, script):
-    """Returns a redis :py:obj:`Script
-    <redis.commands.core.CoreCommands.register_script>` instance.
+    """Returns a valkey :py:obj:`Script
+    <valkey.commands.core.CoreCommands.register_script>` instance.
 
     Due to performance reason the ``Script`` object is instantiated only once
     for a client (``client.register_script(..)``) and is cached in
@@ -28,7 +28,7 @@ def lua_script_storage(client, script):
 
     """
 
-    # redis connection can be closed, lets use the id() of the redis connector
+    # valkey connection can be closed, lets use the id() of the valkey connector
     # as key in the script-storage:
     client_id = id(client)
 
@@ -64,8 +64,8 @@ def purge_by_prefix(client, prefix: str = "SearXNG_"):
     :param prefix: prefix of the key to delete (default: ``SearXNG_``)
     :type name: str
 
-    .. _EXPIRE: https://redis.io/commands/expire/
-    .. _DEL: https://redis.io/commands/del/
+    .. _EXPIRE: https://valkey.io/commands/expire/
+    .. _DEL: https://valkey.io/commands/del/
 
     """
     script = lua_script_storage(client, PURGE_BY_PREFIX)
@@ -76,7 +76,7 @@ def secret_hash(name: str):
     """Creates a hash of the ``name``.
 
     Combines argument ``name`` with the ``secret_key`` from :ref:`settings
-    server`.  This function can be used to get a more anonymized name of a Redis
+    server`.  This function can be used to get a more anonymized name of a Valkey
     KEY.
 
     :param name: the name to create a secret hash for
@@ -112,12 +112,12 @@ return c
 def incr_counter(client, name: str, limit: int = 0, expire: int = 0):
     """Increment a counter and return the new value.
 
-    If counter with redis key ``SearXNG_counter_<name>`` does not exists it is
+    If counter with valkey key ``SearXNG_counter_<name>`` does not exists it is
     created with initial value 1 returned.  The replacement ``<name>`` is a
     *secret hash* of the value from argument ``name`` (see
     :py:func:`secret_hash`).
 
-    The implementation of the redis counter is the lua script from string
+    The implementation of the valkey counter is the lua script from string
     :py:obj:`INCR_COUNTER`.
 
     :param name: name of the counter
@@ -133,8 +133,8 @@ def incr_counter(client, name: str, limit: int = 0, expire: int = 0):
     :return: value of the incremented counter
     :type return: int
 
-    .. _EXPIRE: https://redis.io/commands/expire/
-    .. _INCR: https://redis.io/commands/incr/
+    .. _EXPIRE: https://valkey.io/commands/expire/
+    .. _INCR: https://valkey.io/commands/incr/
 
     A simple demo of a counter with expire time and limit::
 
@@ -157,7 +157,7 @@ def incr_counter(client, name: str, limit: int = 0, expire: int = 0):
 
 
 def drop_counter(client, name):
-    """Drop counter with redis key ``SearXNG_counter_<name>``
+    """Drop counter with valkey key ``SearXNG_counter_<name>``
 
     The replacement ``<name>`` is a *secret hash* of the value from argument
     ``name`` (see :py:func:`incr_counter` and :py:func:`incr_sliding_window`).
@@ -182,7 +182,7 @@ return result
 def incr_sliding_window(client, name: str, duration: int):
     """Increment a sliding-window counter and return the new value.
 
-    If counter with redis key ``SearXNG_counter_<name>`` does not exists it is
+    If counter with valkey key ``SearXNG_counter_<name>`` does not exists it is
     created with initial value 1 returned.  The replacement ``<name>`` is a
     *secret hash* of the value from argument ``name`` (see
     :py:func:`secret_hash`).
@@ -196,27 +196,27 @@ def incr_sliding_window(client, name: str, duration: int):
     :return: value of the incremented counter
     :type return: int
 
-    The implementation of the redis counter is the lua script from string
-    :py:obj:`INCR_SLIDING_WINDOW`.  The lua script uses `sorted sets in Redis`_
-    to implement a sliding window for the redis key ``SearXNG_counter_<name>``
+    The implementation of the valkey counter is the lua script from string
+    :py:obj:`INCR_SLIDING_WINDOW`.  The lua script uses `sorted sets in Valkey`_
+    to implement a sliding window for the valkey key ``SearXNG_counter_<name>``
     (ZADD_).  The current TIME_ is used to score the items in the sorted set and
     the time window is moved by removing items with a score lower current time
     minus *duration* time (ZREMRANGEBYSCORE_).
 
     The EXPIRE_ time (the duration of the sliding window) is refreshed on each
     call (increment) and if there is no call in this duration, the sorted
-    set expires from the redis DB.
+    set expires from the valkey DB.
 
     The return value is the amount of items in the sorted set (ZCOUNT_), what
     means the number of calls in the sliding window.
 
-    .. _Sorted sets in Redis:
-       https://redis.com/ebook/part-1-getting-started/chapter-1-getting-to-know-redis/1-2-what-redis-data-structures-look-like/1-2-5-sorted-sets-in-redis/
-    .. _TIME: https://redis.io/commands/time/
-    .. _ZADD: https://redis.io/commands/zadd/
-    .. _EXPIRE: https://redis.io/commands/expire/
-    .. _ZREMRANGEBYSCORE: https://redis.io/commands/zremrangebyscore/
-    .. _ZCOUNT: https://redis.io/commands/zcount/
+    .. _Sorted sets in Valkey:
+       https://valkey.com/ebook/part-1-getting-started/chapter-1-getting-to-know-valkey/1-2-what-valkey-data-structures-look-like/1-2-5-sorted-sets-in-valkey/
+    .. _TIME: https://valkey.io/commands/time/
+    .. _ZADD: https://valkey.io/commands/zadd/
+    .. _EXPIRE: https://valkey.io/commands/expire/
+    .. _ZREMRANGEBYSCORE: https://valkey.io/commands/zremrangebyscore/
+    .. _ZCOUNT: https://valkey.io/commands/zcount/
 
     A simple demo of the sliding window::
 
diff --git a/searx/webapp.py b/searx/webapp.py
index 868d95e3e..15f79f151 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -118,7 +118,7 @@ from searx.locales import (
 from searx.autocomplete import search_autocomplete, backends as autocomplete_backends
 from searx import favicons
 
-from searx.redisdb import initialize as redis_initialize
+from searx.valkeydb import initialize as valkey_initialize
 from searx.sxng_locales import sxng_locales
 import searx.search
 from searx.network import stream as http_stream, set_context_network_name
@@ -1397,7 +1397,7 @@ def init():
         return
 
     locales_initialize()
-    redis_initialize()
+    valkey_initialize()
     searx.plugins.initialize(app)
 
     metrics: bool = get_setting("general.enable_metrics")  # type: ignore
diff --git a/utils/lib.sh b/utils/lib.sh
index 1ef273535..7886520c6 100755
--- a/utils/lib.sh
+++ b/utils/lib.sh
@@ -7,6 +7,8 @@
 DIST_ID=$(source /etc/os-release; echo "$ID");
 # shellcheck disable=SC2034
 DIST_VERS=$(source /etc/os-release; echo "$VERSION_ID");
+# shellcheck disable=SC2034
+DIST_VERSION_CODENAME=$(source /etc/os-release; echo "$VERSION_CODENAME");
 
 ADMIN_NAME="${ADMIN_NAME:-$(git config user.name)}"
 ADMIN_NAME="${ADMIN_NAME:-$USER}"
diff --git a/utils/lib_redis.sh b/utils/lib_redis.sh
index ba1435a86..3b481dc75 100755
--- a/utils/lib_redis.sh
+++ b/utils/lib_redis.sh
@@ -1,190 +1,26 @@
 #!/usr/bin/env bash
 # -*- coding: utf-8; mode: sh indent-tabs-mode: nil -*-
 # SPDX-License-Identifier: AGPL-3.0-or-later
-#
-# Tools to build and install redis [1] binaries & packages.
-#
-# [1] https://redis.io/download#installation
-#
-# 1. redis.devpkg (sudo)
-# 2. redis.build
-# 3. redis.install (sudo)
-#
-# systemd commands::
-#
-#    sudo -H systemctl status searxng-redis
-#    sudo -H journalctl -u searxng-redis
-#    sudo -H journalctl --vacuum-size=1M
-#
-# Test socket connection from client (local user)::
-#
-#    $ sudo -H ./manage redis.addgrp "${USER}"
-#    # logout & login to get member of group
-#    $ groups
-#    ... searxng-redis ...
-#    $ source /usr/local/searxng-redis/.redis_env
-#    $ which redis-cli
-#    /usr/local/searxng-redis/.local/bin/redis-cli
-#
-#    $ redis-cli -s /usr/local/searxng-redis/redis.sock
-#    redis /usr/local/searxng-redis/redis.sock> set foo bar
-#    OK
-#    redis /usr/local/searxng-redis/redis.sock> get foo
-#    "bar"
-#    [CTRL-D]
-
 
 # shellcheck disable=SC2091
 # shellcheck source=utils/lib.sh
 . /dev/null
 
-REDIS_GIT_URL="https://github.com/redis/redis.git"
-REDIS_GIT_TAG="${REDIS_GIT_TAG:-6.2.6}"
-
 REDIS_USER="searxng-redis"
 REDIS_GROUP="searxng-redis"
 
-REDIS_HOME="/usr/local/${REDIS_USER}"
-REDIS_HOME_BIN="${REDIS_HOME}/.local/bin"
-REDIS_ENV="${REDIS_HOME}/.redis_env"
-
 REDIS_SERVICE_NAME="searxng-redis"
 REDIS_SYSTEMD_UNIT="${SYSTEMD_UNITS}/${REDIS_SERVICE_NAME}.service"
 
-# binaries to compile & install
-REDIS_INSTALL_EXE=(redis-server redis-benchmark redis-cli)
-# link names of redis-server binary
-REDIS_LINK_EXE=(redis-sentinel redis-check-rdb redis-check-aof)
-
-REDIS_CONF="${REDIS_HOME}/redis.conf"
-REDIS_CONF_TEMPLATE=$(cat <<EOF
-# Note that in order to read the configuration file, Redis must be
-# started with the file path as first argument:
-#
-# ./redis-server /path/to/redis.conf
-
-# bind 127.0.0.1 -::1
-protected-mode yes
-
-# Accept connections on the specified port, default is 6379 (IANA #815344).
-# If port 0 is specified Redis will not listen on a TCP socket.
-port 0
-
-# Specify the path for the Unix socket that will be used to listen for
-# incoming connections.
-
-unixsocket ${REDIS_HOME}/run/redis.sock
-unixsocketperm 770
-
-# The working directory.
-dir ${REDIS_HOME}/run
-
-# If you run Redis from upstart or systemd, Redis can interact with your
-# supervision tree.
-supervised auto
-
-pidfile ${REDIS_HOME}/run/redis.pid
-
-# log to the system logger
-syslog-enabled yes
-EOF
-)
-
 redis.help(){
     cat <<EOF
 redis.:
-  devpkg    : install essential packages to compile redis
-  build     : build redis binaries at $(redis._get_dist)
-  install   : create user (${REDIS_USER}) and install systemd service (${REDIS_SERVICE_NAME})
   remove    : delete user (${REDIS_USER}) and remove service (${REDIS_SERVICE_NAME})
-  shell     : start bash interpreter from user ${REDIS_USER}
-  src       : clone redis source code to <path> and checkput ${REDIS_GIT_TAG}
-  useradd   : create user (${REDIS_USER}) at ${REDIS_HOME}
   userdel   : delete user (${REDIS_USER})
-  addgrp    : add <user> to group (${REDIS_USER})
   rmgrp     : remove <user> from group (${REDIS_USER})
 EOF
 }
 
-redis.devpkg() {
-
-    # Uses OS package manager to install the essential packages to build and
-    # compile sources
-
-    sudo_or_exit
-
-    case ${DIST_ID} in
-        ubuntu|debian)
-            pkg_install git build-essential gawk
-            ;;
-        arch)
-            pkg_install git base-devel
-            ;;
-        fedora)
-            pkg_install git @development-tools
-            ;;
-        centos)
-            pkg_install git
-            yum groupinstall "Development Tools" -y
-            ;;
-        *)
-            err_msg "$DIST_ID-$DIST_VERS: No rules to install development tools from OS."
-            return 42
-            ;;
-    esac
-}
-
-redis.build() {
-
-    # usage: redis.build
-
-    rst_title "get redis sources" section
-    redis.src "${CACHE}/redis"
-
-    if ! required_commands gcc nm make gawk ; then
-        info_msg "install development tools to get missing command(s) .."
-        if [[ -n ${SUDO_USER} ]]; then
-            sudo -H "$0" redis.devpkg
-        else
-            redis.devpkg
-        fi
-    fi
-
-    rst_title "compile redis sources" section
-
-    pushd "${CACHE}/redis" &>/dev/null
-
-    if ask_yn "Do you run 'make distclean' first'?" Yn; then
-        $(bash.cmd) -c "make distclean" 2>&1 | prefix_stdout
-    fi
-
-    $(bash.cmd) -c "make" 2>&1 | prefix_stdout
-    if ask_yn "Do you run 'make test'?" Ny; then
-        $(bash.cmd) -c "make test" | prefix_stdout
-    fi
-
-    popd &>/dev/null
-
-    tee_stderr 0.1 <<EOF | $(bash.cmd) 2>&1 | prefix_stdout
-mkdir -p "$(redis._get_dist)"
-cd "${CACHE}/redis/src"
-cp ${REDIS_INSTALL_EXE[@]} "$(redis._get_dist)"
-EOF
-    info_msg "redis binaries available at $(redis._get_dist)"
-}
-
-
-redis.install() {
-    sudo_or_exit
-    (
-        set -e
-        redis.useradd
-        redis._install_bin
-        redis._install_conf
-        redis._install_service
-    )
-    dump_return $?
-}
 
 redis.remove() {
     sudo_or_exit
@@ -200,57 +36,6 @@ redis.shell() {
     interactive_shell "${REDIS_USER}"
 }
 
-redis.src() {
-
-    # usage: redis.src "${CACHE}/redis"
-
-    local dest="${1:-${CACHE}/redis}"
-
-    if [ -d "${dest}" ] ; then
-        info_msg "already cloned: $dest"
-        tee_stderr 0.1 <<EOF | $(bash.cmd) 2>&1 | prefix_stdout
-cd "${dest}"
-git fetch --all
-git reset --hard tags/${REDIS_GIT_TAG}
-EOF
-    else
-        tee_stderr 0.1 <<EOF | $(bash.cmd) 2>&1 | prefix_stdout
-mkdir -p "$(dirname "$dest")"
-cd "$(dirname "$dest")"
-git clone "${REDIS_GIT_URL}" "${dest}"
-EOF
-        tee_stderr 0.1 <<EOF | $(bash.cmd) 2>&1 | prefix_stdout
-cd "${dest}"
-git checkout tags/${REDIS_GIT_TAG} -b "build-branch"
-EOF
-    fi
-}
-
-redis.useradd(){
-
-    # usage: redis.useradd
-
-    rst_title "add user ${REDIS_USER}" section
-    echo
-    sudo_or_exit
-
-    # create user account
-    tee_stderr 0.5 <<EOF | sudo -H bash | prefix_stdout
-useradd --shell /bin/bash --system \
- --home-dir "${REDIS_HOME}" \
- --comment 'user that runs a redis instance' "${REDIS_USER}"
-mkdir -p "${REDIS_HOME}"
-chown -R "${REDIS_USER}:${REDIS_GROUP}" "${REDIS_HOME}"
-groups "${REDIS_USER}"
-EOF
-
-    # create App-ENV and add source it in the .profile
-    tee_stderr 0.5 <<EOF | sudo -H -u "${REDIS_USER}" bash | prefix_stdout
-mkdir -p "${REDIS_HOME_BIN}"
-echo "export PATH=${REDIS_HOME_BIN}:\\\$PATH" > "${REDIS_ENV}"
-grep -qFs -- 'source "${REDIS_ENV}"' ~/.profile || echo 'source "${REDIS_ENV}"' >> ~/.profile
-EOF
-}
 
 redis.userdel() {
     sudo_or_exit
@@ -275,81 +60,6 @@ redis.rmgrp() {
 
 }
 
-
-# private redis. functions
-# ------------------------
-
-redis._install_bin() {
-    local src
-    src="$(redis._get_dist)"
-    (
-        set -e
-        for redis_exe in "${REDIS_INSTALL_EXE[@]}"; do
-            install -v -o "${REDIS_USER}" -g "${REDIS_GROUP}" \
-                 "${src}/${redis_exe}" "${REDIS_HOME_BIN}"
-        done
-
-        pushd "${REDIS_HOME_BIN}" &> /dev/null
-        for redis_exe in "${REDIS_LINK_EXE[@]}"; do
-            info_msg "link redis-server --> ${redis_exe}"
-            sudo -H -u "${REDIS_USER}" ln -sf redis-server "${redis_exe}"
-        done
-        popd &> /dev/null
-
-    )
-}
-
-redis._install_conf() {
-        sudo -H -u "${REDIS_USER}" bash <<EOF
-mkdir -p "${REDIS_HOME}/run"
-echo '${REDIS_CONF_TEMPLATE}' > "${REDIS_CONF}"
-EOF
-}
-
-redis._install_service() {
-    systemd_install_service "${REDIS_SERVICE_NAME}" "${REDIS_SYSTEMD_UNIT}"
-}
-
 redis._remove_service() {
     systemd_remove_service "${REDIS_SERVICE_NAME}" "${REDIS_SYSTEMD_UNIT}"
 }
-
-redis._get_dist() {
-    if [ -z "${REDIS_DIST}" ]; then
-        echo "${REPO_ROOT}/dist/redis/${REDIS_GIT_TAG}/$(redis._arch)"
-    else
-        echo "${REDIS_DIST}"
-    fi
-}
-
-redis._arch() {
-    local ARCH
-    case "$(command uname -m)" in
-        "x86_64") ARCH=amd64 ;;
-        "aarch64") ARCH=arm64 ;;
-        "armv6" | "armv7l") ARCH=armv6l ;;
-        "armv8") ARCH=arm64 ;;
-        .*386.*) ARCH=386 ;;
-        ppc64*) ARCH=ppc64le ;;
-    *)  die 42 "ARCH is unknown: $(command uname -m)" ;;
-    esac
-    echo "${ARCH}"
-}
-
-# TODO: move this to the right place ..
-
-bash.cmd(){
-
-    # print cmd to get a bash in a non-root mode, even if we are in a sudo
-    # context.
-
-    local user="${USER}"
-    local bash_cmd="bash"
-
-    if [ -n "${SUDO_USER}" ] && [ "root" != "${SUDO_USER}" ] ; then
-        user="${SUDO_USER}"
-        bash_cmd="sudo -H -u ${SUDO_USER} bash"
-    fi
-
-    printf "%s" "${bash_cmd}"
-}
diff --git a/utils/lib_valkey.sh b/utils/lib_valkey.sh
new file mode 100755
index 000000000..7e7beb948
--- /dev/null
+++ b/utils/lib_valkey.sh
@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+valkey.distro.setup() {
+    # shellcheck disable=SC2034
+
+    case $DIST_ID in
+        ubuntu|debian)
+            VALKEY_PACKAGES="valkey-server"
+            ;;
+        arch|fedora|centos)
+            VALKEY_PACKAGES="valkey"
+            ;;
+        *)
+            err_msg "$DIST_ID: valkey not yet implemented"
+            ;;
+    esac
+}
+
+valkey.backports() {
+
+    case $DIST_ID in
+        debian)
+            info_msg "APT:: install debian-stable-backports.source / ${DIST_ID}-${DIST_VERS} (${DIST_VERSION_CODENAME})"
+            install_template /etc/apt/sources.list.d/debian-stable-backports.sources
+            apt update
+            ;;
+        ubuntu)
+            info_msg "APT:: install ubuntu-stable-backports.source / ${DIST_ID}-${DIST_VERS} (${DIST_VERSION_CODENAME})"
+            install_template /etc/apt/sources.list.d/ubuntu-stable-backports.sources
+            apt update
+            ;;
+        *)
+            info_msg "APT:: valkey.backports no implementation / ${DIST_ID}-${DIST_VERS} (${DIST_VERSION_CODENAME})"
+            ;;
+    esac
+}
+
+valkey.install(){
+    info_msg "installing valkey ..."
+    valkey.distro.setup
+
+    case $DIST_ID in
+        debian|ubuntu)
+            apt-cache show "${VALKEY_PACKAGES}" &> /dev/null  || valkey.backports
+            pkg_install "${VALKEY_PACKAGES}"
+
+            # do some fix ...
+            # chown -R valkey:valkey /var/log/valkey/ /var/lib/valkey/ /etc/valkey/
+
+            # https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#PrivateUsers=
+            sed -i 's/PrivateUsers=true/# PrivateUsers=true/' /lib/systemd/system/valkey-server.service
+            sed -i 's/PrivateUsers=true/# PrivateUsers=true/' /lib/systemd/system/valkey-server@.service
+
+            systemd_activate_service valkey-server
+            ;;
+        arch|fedora|centos)
+            pkg_install "${VALKEY_PACKAGES}"
+            systemd_activate_service valkey
+            ;;
+        *)
+            # install backports if package is not in the current APT repos
+            pkg_install "${VALKEY_PACKAGES}"
+            ;;
+    esac
+
+    # case $DIST_ID-$DIST_VERS in
+    #     arch-*|fedora-*|centos-7)
+    #         systemctl enable nginx
+    #         systemctl start nginx
+    #         ;;
+    # esac
+}
diff --git a/utils/searxng.sh b/utils/searxng.sh
index 4ad2ef93f..663ca6d3d 100755
--- a/utils/searxng.sh
+++ b/utils/searxng.sh
@@ -9,6 +9,8 @@ SEARXNG_UWSGI_USE_SOCKET="${SEARXNG_UWSGI_USE_SOCKET:-true}"
 source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
 # shellcheck source=utils/lib_redis.sh
 source "$(dirname "${BASH_SOURCE[0]}")/lib_redis.sh"
+# shellcheck source=utils/lib_valkey.sh
+source "$(dirname "${BASH_SOURCE[0]}")/lib_valkey.sh"
 # shellcheck source=utils/brand.sh
 source "${REPO_ROOT}/utils/brand.sh"
 
@@ -119,8 +121,8 @@ usage() {
     # shellcheck disable=SC1117
     cat <<EOF
 usage:
-  $(basename "$0") install    [all|user|pyenv|settings|uwsgi|redis|nginx|apache|searxng-src|packages|buildhost]
-  $(basename "$0") remove     [all|user|pyenv|settings|uwsgi|redis|nginx|apache]
+  $(basename "$0") install    [all|user|pyenv|settings|uwsgi|valkey|nginx|apache|searxng-src|packages|buildhost]
+  $(basename "$0") remove     [all|user|pyenv|settings|uwsgi|valkey|nginx|apache]
   $(basename "$0") instance   [cmd|update|check|localtest|inspect]
 install|remove:
   all           : complete (de-) installation of the SearXNG service
@@ -128,10 +130,13 @@ install|remove:
   pyenv         : virtualenv (python) in ${SEARXNG_PYENV}
   settings      : settings from ${SEARXNG_SETTINGS_PATH}
   uwsgi         : SearXNG's uWSGI app ${SEARXNG_UWSGI_APP}
-  redis         : build & install or remove a local redis server ${REDIS_HOME}/run/redis.sock
   nginx         : HTTP site ${NGINX_APPS_AVAILABLE}/${NGINX_SEARXNG_SITE}
   apache        : HTTP site ${APACHE_SITES_AVAILABLE}/${APACHE_SEARXNG_SITE}
 install:
+  valkey        : install a local valkey server
+remove:
+  redis         : remove a local redis server ${REDIS_HOME}/run/redis.sock
+install:
   searxng-src   : clone ${GIT_URL} into ${SEARXNG_SRC}
   packages      : installs packages from OS package manager required by SearXNG
   buildhost     : installs packages from OS package manager required by a SearXNG buildhost
@@ -194,7 +199,7 @@ main() {
                 buildhost) searxng.install.buildhost;;
                 nginx) searxng.nginx.install;;
                 apache) searxng.apache.install;;
-                redis) searxng.install.redis;;
+                valkey) searxng.install.valkey;;
                 *) usage "$_usage"; exit 42;;
             esac
             ;;
@@ -208,6 +213,7 @@ main() {
                 uwsgi) searxng.remove.uwsgi;;
                 apache) searxng.apache.remove;;
                 remove) searxng.nginx.remove;;
+                valkey) searxng.remove.valkey;;
                 redis) searxng.remove.redis;;
                 *) usage "$_usage"; exit 42;;
             esac
@@ -259,7 +265,7 @@ main() {
 searxng.install.all() {
     rst_title "SearXNG installation" part
 
-    local redis_url
+    local valkey_url
 
     rst_title "SearXNG"
     searxng.install.packages
@@ -277,8 +283,8 @@ searxng.install.all() {
     searxng.install.uwsgi
     wait_key
 
-    rst_title "Redis DB"
-    searxng.install.redis.db
+    rst_title "Valkey DB"
+    searxng.install.valkey.db
 
     rst_title "HTTP Server"
     searxng.install.http.site
@@ -289,77 +295,35 @@ searxng.install.all() {
     fi
 }
 
-searxng.install.redis.db() {
-    local redis_url
+searxng.install.valkey.db() {
+    local valkey_url
 
-    redis_url=$(searxng.instance.get_setting redis.url)
-    rst_para "\
-In your instance, redis DB connector is configured at:
+    valkey_url=$(searxng.instance.get_setting valkey.url)
 
-    ${redis_url}
+    if [ "${valkey_url}" = "False" ]; then
+        rst_para "valkey DB connector is not configured in your instance"
+    else
+        rst_para "\
+In your instance, valkey DB connector is configured at:
+
+    ${valkey_url}
 "
-    if searxng.instance.exec python -c "from searx import redisdb; redisdb.initialize() or exit(42)"; then
-        info_msg "SearXNG instance is able to connect redis DB."
-        return
+        if searxng.instance.exec python -c "from searx import valkeydb; valkeydb.initialize() or exit(42)"; then
+            info_msg "SearXNG instance is able to connect valkey DB."
+            return
+        fi
     fi
-    if ! [[ ${redis_url} = unix://${REDIS_HOME}/run/redis.sock* ]]; then
-        err_msg "SearXNG instance can't connect redis DB / check redis & your settings"
+
+    if ! [[ ${valkey_url} = valkey://localhost:6379/* ]]; then
+        err_msg "SearXNG instance can't connect valkey DB / check valkey & your settings"
         return
     fi
-    rst_para ".. but this redis DB is not installed yet."
+    rst_para ".. but this valkey DB is not installed yet."
 
-    case $DIST_ID-$DIST_VERS in
-        fedora-*)
-            # Fedora runs uWSGI in emperor-tyrant mode: in Tyrant mode the
-            # Emperor will run the vassal using the UID/GID of the vassal
-            # configuration file [1] (user and group of the app .ini file).
-            #
-            # HINT: without option ``emperor-tyrant-initgroups=true`` in
-            # ``/etc/uwsgi.ini`` the process won't get the additional groups,
-            # but this option is not available in 2.0.x branch [2][3] / on
-            # fedora35 there is v2.0.20 installed --> no way to get additional
-            # groups on fedora's tyrant mode.
-            #
-            # ERROR:searx.redisdb: [searxng (993)] can't connect redis DB ...
-            # ERROR:searx.redisdb:   Error 13 connecting to unix socket: /usr/local/searxng-redis/run/redis.sock. Permission denied.
-            # ERROR:searx.plugins.limiter: init limiter DB failed!!!
-            #
-            # $ ps -aef | grep '/usr/sbin/uwsgi --ini searxng.ini'
-            # searxng       93      92  0 12:43 ?        00:00:00 /usr/sbin/uwsgi --ini searxng.ini
-            # searxng      186      93  0 12:44 ?        00:00:01 /usr/sbin/uwsgi --ini searxng.ini
-            #
-            # Additional groups:
-            #
-            # $ groups searxng
-            # searxng : searxng searxng-redis
-            #
-            # Here you can see that the additional "Groups" of PID 186 are unset
-            # (missing gid of searxng-redis)
-            #
-            # $ cat /proc/186/task/186/status
-            # ...
-            # Uid:      993     993     993     993
-            # Gid:      993     993     993     993
-            # FDSize:   128
-            # Groups:
-            # ...
-            #
-            # [1] https://uwsgi-docs.readthedocs.io/en/latest/Emperor.html#tyrant-mode-secure-multi-user-hosting
-            # [2] https://github.com/unbit/uwsgi/issues/2099
-            # [3] https://github.com/unbit/uwsgi/pull/752
-
-            rst_para "\
-Fedora uses emperor-tyrant mode / in this mode we had a lot of trouble with
-sockets and permissions of the vasals.  We recommend to setup a redis DB
-and using redis:// TCP protocol in the settings.yml configuration."
-            ;;
-        *)
-            if ask_yn "Do you want to install the redis DB now?" Yn; then
-                searxng.install.redis
-                uWSGI_restart "$SEARXNG_UWSGI_APP"
-            fi
-            ;;
-    esac
+    if ask_yn "Do you want to install the valkey DB now?" Yn; then
+        searxng.install.valkey
+        uWSGI_restart "$SEARXNG_UWSGI_APP"
+    fi
 }
 
 searxng.install.http.site() {
@@ -380,16 +344,16 @@ searxng.install.http.site() {
 }
 
 searxng.remove.all() {
-    local redis_url
+    local valkey_url
 
     rst_title "De-Install SearXNG (service)"
     if ! ask_yn "Do you really want to deinstall SearXNG?"; then
         return
     fi
 
-    redis_url=$(searxng.instance.get_setting redis.url)
-    if ! [[ ${redis_url} = unix://${REDIS_HOME}/run/redis.sock* ]]; then
-        searxng.remove.redis
+    valkey_url=$(searxng.instance.get_setting valkey.url)
+    if ! [[ ${valkey_url} = unix://${VALKEY_HOME}/run/valkey.sock* ]]; then
+        searxng.remove.valkey
     fi
 
     searxng.remove.uwsgi
@@ -642,19 +606,18 @@ searxng.remove.uwsgi() {
     uWSGI_remove_app "${SEARXNG_UWSGI_APP}"
 }
 
-searxng.install.redis() {
-    rst_title "SearXNG (install redis)"
-    redis.build
-    redis.install
-    redis.addgrp "${SERVICE_USER}"
-}
-
 searxng.remove.redis() {
     rst_title "SearXNG (remove redis)"
     redis.rmgrp "${SERVICE_USER}"
     redis.remove
 }
 
+searxng.install.valkey() {
+    rst_title "SearXNG (install valkey)"
+    valkey.install
+}
+
+
 searxng.instance.localtest() {
     rst_title "Test SearXNG instance locally" section
     rst_para "Activate debug mode, start a minimal SearXNG "\
@@ -690,11 +653,11 @@ To install uWSGI use::
         die 42 "SearXNG's uWSGI app not available"
     fi
 
-    if ! searxng.instance.exec python -c "from searx import redisdb; redisdb.initialize() or exit(42)"; then
+    if ! searxng.instance.exec python -c "from searx import valkeydb; valkeydb.initialize() or exit(42)"; then
         rst_para "\
-The configured redis DB is not available: If your server is public to the
+The configured valkey DB is not available: If your server is public to the
 internet, you should setup a bot protection to block excessively bot queries.
-Bot protection requires a redis DB.  About bot protection visit the official
+Bot protection requires a valkey DB.  About bot protection visit the official
 SearXNG documentation and query for the word 'limiter'.
 "
     fi
diff --git a/utils/searxng_check.py b/utils/searxng_check.py
index 0bff756ad..b597b3e79 100644
--- a/utils/searxng_check.py
+++ b/utils/searxng_check.py
@@ -34,8 +34,11 @@ if os.path.isfile(OLD_BRAND_ENV):
     msg = ('%s is no longer needed, remove the file' % (OLD_BRAND_ENV))
     warnings.warn(msg, DeprecationWarning)
 
-from searx import redisdb, get_setting
+from searx import valkeydb, get_setting
 
-if not redisdb.initialize():
-    warnings.warn("can't connect to redis DB at: %s" % get_setting('redis.url'), RuntimeWarning, stacklevel=2)
-    warnings.warn("--> no bot protection without redis DB", RuntimeWarning, stacklevel=2)
+if get_setting('redis.url'):
+    warnings.warn("setting redis.url is deprecated, use valkey.url", RuntimeWarning, stacklevel=2)
+
+if not valkeydb.initialize():
+    warnings.warn("can't connect to valkey DB at: %s" % get_setting('valkey.url'), RuntimeWarning, stacklevel=2)
+    warnings.warn("--> no bot protection without valkey DB", RuntimeWarning, stacklevel=2)
diff --git a/utils/templates/etc/apt/sources.list.d/debian-stable-backports.sources b/utils/templates/etc/apt/sources.list.d/debian-stable-backports.sources
new file mode 100644
index 000000000..251b2ccb7
--- /dev/null
+++ b/utils/templates/etc/apt/sources.list.d/debian-stable-backports.sources
@@ -0,0 +1,6 @@
+Types: deb deb-src
+URIs: http://deb.debian.org/debian
+Suites: stable-backports
+Components: main contrib non-free non-free-firmware
+Enabled: yes
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
diff --git a/utils/templates/etc/apt/sources.list.d/ubuntu-stable-backports.sources b/utils/templates/etc/apt/sources.list.d/ubuntu-stable-backports.sources
new file mode 100644
index 000000000..a429a1349
--- /dev/null
+++ b/utils/templates/etc/apt/sources.list.d/ubuntu-stable-backports.sources
@@ -0,0 +1,6 @@
+Types: deb deb-src
+URIs: http://us.archive.ubuntu.com/ubuntu/
+Suites: ${DIST_VERSION_CODENAME}-backports
+Components: main multiverse restricted universe
+Enabled: yes
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
diff --git a/utils/templates/etc/searxng/settings.yml b/utils/templates/etc/searxng/settings.yml
index c5ecbd777..b5da38ebd 100644
--- a/utils/templates/etc/searxng/settings.yml
+++ b/utils/templates/etc/searxng/settings.yml
@@ -21,9 +21,9 @@ server:
   # by ${SEARXNG_BASE_URL}.
   # base_url: http://example.com/location
 
-redis:
-  # URL to connect redis database. Is overwritten by ${SEARXNG_REDIS_URL}.
-  url: unix:///usr/local/searxng-redis/run/redis.sock?db=0
+valkey:
+  # URL to connect valkey database. Is overwritten by ${SEARXNG_VALKEY_URL}.
+  url: valkey://localhost:6379/0
 
 ui:
   static_use_hash: true
diff --git a/utils/templates/lib/systemd/system/searxng-redis.service b/utils/templates/lib/systemd/system/searxng-redis.service
deleted file mode 100644
index d1d163f04..000000000
--- a/utils/templates/lib/systemd/system/searxng-redis.service
+++ /dev/null
@@ -1,42 +0,0 @@
-[Unit]
-
-Description=SearXNG redis service
-After=syslog.target
-After=network.target
-Documentation=https://redis.io/documentation
-
-[Service]
-
-Type=simple
-User=${REDIS_USER}
-Group=${REDIS_USER}
-WorkingDirectory=${REDIS_HOME}
-Restart=always
-TimeoutStopSec=0
-
-Environment=USER=${REDIS_USER} HOME=${REDIS_HOME}
-ExecStart=${REDIS_HOME_BIN}/redis-server ${REDIS_CONF}
-ExecPaths=${REDIS_HOME_BIN}
-
-LimitNOFILE=65535
-NoNewPrivileges=true
-PrivateDevices=yes
-
-# ProtectSystem=full
-ProtectHome=yes
-ReadOnlyDirectories=/
-ReadWritePaths=-${REDIS_HOME}/run
-
-UMask=007
-PrivateTmp=yes
-
-MemoryDenyWriteExecute=true
-ProtectKernelModules=true
-ProtectKernelTunables=true
-ProtectControlGroups=true
-RestrictRealtime=true
-RestrictNamespaces=true
-
-[Install]
-
-WantedBy=multi-user.target