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searxng/docs/admin/installation-docker.rst
Alexandre Flament bd3f526859
Docker: add UWSGI_WORKERS and UWSGI_THREAD environment variables (#2992)
* Docker: add UWSGI_WORKERS and UWSGI_THREAD.

UWSGI_WORKERS specifies the number of process.
UWSGI_THREADS specifies the number of threads.

The Docker convention is to specify the whole configuration
through environment variables. While not done in SearXNG, these two
additional variables allows admins to skip uwsgi.ini

In additional, https://github.com/searxng/preview-environments starts Docker
without additional files through searxng-helm-chat.
Each instance consumes 1Go of RAM which is a lot especially when there are a
lot of instances / pull requests.

* [scripts] add environments UWSGI_WORKERS and UWSGI_THREADS

- UWSGI_WORKERS specifies the number of process.
- UWSGI_THREADS specifies the number of threads.

Templates for uwsgi scripts can be tested by::

    UWSGI_WORKERS=8 UWSGI_THREADS=9 \
      ./utils/searxng.sh --cmd\
      eval "echo \"$(cat utils/templates/etc/uwsgi/*/searxng.ini*)\""\
      | grep "workers\|threads"

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

---------

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>
2023-11-12 16:46:34 +00:00

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.. _installation docker:
================
Docker Container
================
.. _ENTRYPOINT: https://docs.docker.com/engine/reference/builder/#entrypoint
.. _searxng/searxng @dockerhub: https://hub.docker.com/r/searxng/searxng
.. _searxng-docker: https://github.com/searxng/searxng-docker
.. _[caddy]: https://hub.docker.com/_/caddy
.. _Redis: https://redis.io/
----
.. sidebar:: info
- `searxng/searxng @dockerhub`_
- :origin:`Dockerfile`
- `Docker overview <https://docs.docker.com/get-started/overview>`_
- `Docker Cheat Sheet <https://docs.docker.com/get-started/docker_cheatsheet.pdf>`_
- `Alpine Linux <https://alpinelinux.org>`_
`(wiki) <https://en.wikipedia.org/wiki/Alpine_Linux>`__
`apt packages <https://pkgs.alpinelinux.org/packages>`_
- Alpine's ``/bin/sh`` is :man:`dash`
**If you intend to create a public instance using Docker, use our well maintained
docker container**
- `searxng/searxng @dockerhub`_.
.. sidebar:: hint
The rest of this article is of interest only to those who want to create and
maintain their own Docker images.
The sources are hosted at searxng-docker_ and the container includes:
- a HTTPS reverse proxy `[caddy]`_ and
- a Redis_ DB
The `default SearXNG setup <https://github.com/searxng/searxng-docker/blob/master/searxng/settings.yml>`_
of this container:
- enables :ref:`limiter <limiter>` to protect against bots
- enables :ref:`image proxy <image_proxy>` for better privacy
- enables :ref:`cache busting <static_use_hash>` to save bandwidth
----
Get Docker
==========
If you plan to build and maintain a docker image by yourself, make sure you have
`Docker installed <https://docs.docker.com/get-docker/>`_. On Linux don't
forget to add your user to the docker group (log out and log back in so that
your group membership is re-evaluated):
.. code:: sh
$ sudo usermod -a -G docker $USER
searxng/searxng
===============
.. sidebar:: ``docker run``
- `-\-rm <https://docs.docker.com/engine/reference/run/#clean-up---rm>`__
automatically clean up when container exits
- `-d <https://docs.docker.com/engine/reference/run/#detached--d>`__ start
detached container
- `-v <https://docs.docker.com/engine/reference/run/#volume-shared-filesystems>`__
mount volume ``HOST:CONTAINER``
The docker image is based on :origin:`Dockerfile` and available from
`searxng/searxng @dockerhub`_. Using the docker image is quite easy, for
instance you can pull the `searxng/searxng @dockerhub`_ image and deploy a local
instance using `docker run <https://docs.docker.com/engine/reference/run/>`_:
.. code:: sh
$ mkdir my-instance
$ cd my-instance
$ export PORT=8080
$ docker pull searxng/searxng
$ docker run --rm \
-d -p ${PORT}:8080 \
-v "${PWD}/searxng:/etc/searxng" \
-e "BASE_URL=http://localhost:$PORT/" \
-e "INSTANCE_NAME=my-instance" \
searxng/searxng
2f998.... # container's ID
The environment variables UWSGI_WORKERS and UWSGI_THREADS overwrite the default
number of UWSGI processes and UWSGI threads specified in `/etc/searxng/uwsgi.ini`.
Open your WEB browser and visit the URL:
.. code:: sh
$ xdg-open "http://localhost:$PORT"
Inside ``${PWD}/searxng``, you will find ``settings.yml`` and ``uwsgi.ini``. You
can modify these files according to your needs and restart the Docker image.
.. code:: sh
$ docker container restart 2f998
Use command ``container ls`` to list running containers, add flag `-a
<https://docs.docker.com/engine/reference/commandline/container_ls>`__ to list
exited containers also. With ``container stop`` a running container can be
stopped. To get rid of a container use ``container rm``:
.. code:: sh
$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED ...
2f998d725993 searxng/searxng "/sbin/tini -- /usr/…" 7 minutes ago ...
$ docker container stop 2f998
$ docker container rm 2f998
.. sidebar:: Warning
This might remove all docker items, not only those from SearXNG.
If you won't use docker anymore and want to get rid of all containers & images
use the following *prune* command:
.. code:: sh
$ docker stop $(docker ps -aq) # stop all containers
$ docker system prune # make some housekeeping
$ docker rmi -f $(docker images -q) # drop all images
shell inside container
----------------------
.. sidebar:: Bashism
- `A tale of two shells: bash or dash <https://lwn.net/Articles/343924/>`_
- `How to make bash scripts work in dash <http://mywiki.wooledge.org/Bashism>`_
- `Checking for Bashisms <https://dev.to/bowmanjd/writing-bash-scripts-that-are-not-only-bash-checking-for-bashisms-and-testing-with-dash-1bli>`_
Like in many other distributions, Alpine's `/bin/sh
<https://wiki.ubuntu.com/DashAsBinSh>`__ is :man:`dash`. Dash is meant to be
`POSIX-compliant <https://pubs.opengroup.org/onlinepubs/9699919799>`__.
Compared to debian, in the Alpine image :man:`bash` is not installed. The
:origin:`dockerfiles/docker-entrypoint.sh` script is checked *against dash*
(``make tests.shell``).
To open a shell inside the container:
.. code:: sh
$ docker exec -it 2f998 sh
Build the image
===============
It's also possible to build SearXNG from the embedded :origin:`Dockerfile`::
$ git clone https://github.com/searxng/searxng.git
$ cd searxng
$ make docker.build
...
Successfully built 49586c016434
Successfully tagged searxng/searxng:latest
Successfully tagged searxng/searxng:1.0.0-209-9c823800-dirty
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
searxng/searxng 1.0.0-209-9c823800-dirty 49586c016434 13 minutes ago 308MB
searxng/searxng latest 49586c016434 13 minutes ago 308MB
alpine 3.13 6dbb9cc54074 3 weeks ago 5.61MB
Command line
============
.. sidebar:: docker run
Use flags ``-it`` for `interactive processes
<https://docs.docker.com/engine/reference/run/#foreground>`__.
In the :origin:`Dockerfile` the ENTRYPOINT_ is defined as
:origin:`dockerfiles/docker-entrypoint.sh`
.. code:: sh
docker run --rm -it searxng/searxng -h
.. program-output:: ../dockerfiles/docker-entrypoint.sh -h