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