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.. _searx uwsgi:
=====
uwsgi
=====
.. sidebar:: further reading
- `systemd.unit`_
- `uWSGI Emperor`_
.. contents:: Contents
:depth: 2
:local:
:backlinks: entry
.. _systemd.unit: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
.. _One service per app in systemd:
https://uwsgi-docs.readthedocs.io/en/latest/Systemd.html#one-service-per-app-in-systemd
.. _uWSGI Emperor:
https://uwsgi-docs.readthedocs.io/en/latest/Emperor.html
.. _uwsgi ini file:
https://uwsgi-docs.readthedocs.io/en/latest/Configuration.html#ini-files
.. _systemd unit template:
http://0pointer.de/blog/projects/instances.html
Origin uWSGI
============
How uWSGI is implemented by distributors is different. uWSGI itself
recommend two methods
`systemd.unit`_ template files as described here `One service per app in systemd`_.
There is one `systemd unit template`_ and one `uwsgi ini file`_ per uWSGI-app
placed at dedicated locations. Take archlinux and a searx.ini as example::
unit template --> /usr/lib/systemd/system/uwsgi@.service
uwsgi ini files --> /etc/uwsgi/searx.ini
The searx app can be maintained as know from common systemd units::
systemctl enable uwsgi@searx
systemctl start uwsgi@searx
systemctl restart uwsgi@searx
systemctl stop uwsgi@searx
The `uWSGI Emperor`_ mode which fits for maintaining a large range of uwsgi apps.
The Emperor mode is a special uWSGI instance that will monitor specific
events. The Emperor mode (service) is started by a (common, not template)
systemd unit. The Emperor service will scan specific directories for `uwsgi
ini file`_\s (also know as *vassals*). If a *vassal* is added, removed or the
timestamp is modified, a corresponding action takes place: a new uWSGI
instance is started, reload or stopped. Take Fedora and a searx.ini as
example::
to start a new searx instance create --> /etc/uwsgi.d/searx.ini
to reload the instance edit timestamp --> touch /etc/uwsgi.d/searx.ini
to stop instance remove ini --> rm /etc/uwsgi.d/searx.ini
Distributors
============
The `uWSGI Emperor`_ mode and `systemd unit template`_ is what the distributors
mostly offer their users, even if they differ in the way they implement both
modes and their defaults. Another point they might differ is the packaging of
plugins (if so, compare :ref:`install packages`) and what the default python
interpreter is (python2 vs. python3).
Fedora starts a Emperor by default, while archlinux does not start any uwsgi
service by default. Worth to know; debian (ubuntu) follow a complete different
approach. *debian*: your are familiar with the apache infrastructure? .. they
do similar for the uWSGI infrastructure (with less comfort), the folders are::
/etc/uwsgi/apps-available/
/etc/uwsgi/apps-enabled/
The `uwsgi ini file`_ is enabled by a symbolic link::
ln -s /etc/uwsgi/apps-available/searx.ini /etc/uwsgi/apps-enabled/
From debian's documentation (``/usr/share/doc/uwsgi/README.Debian.gz``): You
could control specific instance(s) by issuing::
service uwsgi <command> <confname> <confname> ...
sudo -H service uwsgi start searx
sudo -H service uwsgi stop searx
My experience is, that this command is a bit buggy.
.. _uwsgi configuration:
Alltogether
===========
Create the configuration ini-file according to your distribution (see below) and
restart the uwsgi application.
.. tabs::
.. group-tab:: Ubuntu / debian
.. kernel-include:: $DOCS_BUILD/includes/searx.rst
:start-after: START searx uwsgi-description ubuntu-20.04
:end-before: END searx uwsgi-description ubuntu-20.04
.. group-tab:: Arch Linux
.. kernel-include:: $DOCS_BUILD/includes/searx.rst
:start-after: START searx uwsgi-description arch
:end-before: END searx uwsgi-description arch
.. group-tab:: Fedora / RHEL
.. kernel-include:: $DOCS_BUILD/includes/searx.rst
:start-after: START searx uwsgi-description fedora
:end-before: END searx uwsgi-description fedora
.. tabs::
.. group-tab:: Ubuntu / debian
.. kernel-include:: $DOCS_BUILD/includes/searx.rst
:code: ini
:start-after: START searx uwsgi-appini ubuntu-20.04
:end-before: END searx uwsgi-appini ubuntu-20.04
.. group-tab:: Arch Linux
.. kernel-include:: $DOCS_BUILD/includes/searx.rst
:code: ini
:start-after: START searx uwsgi-appini arch
:end-before: END searx uwsgi-appini arch
.. group-tab:: Fedora / RHEL
.. kernel-include:: $DOCS_BUILD/includes/searx.rst
:code: ini
:start-after: START searx uwsgi-appini fedora
:end-before: END searx uwsgi-appini fedora