mirror of
https://github.com/searxng/searxng.git
synced 2024-11-22 04:01:40 +01:00
5720844fcd
We have built up detailed documentation of the *settings* and the *engines* over the past few years. However, this documentation was still spread over various chapters and was difficult to navigate in its entirety. This patch rearranges the Settings & Engines documentation for better readability. To review new ordered docs:: make docs.clean docs.live Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
269 lines
9.1 KiB
ReStructuredText
269 lines
9.1 KiB
ReStructuredText
.. _searxng uwsgi:
|
|
|
|
=====
|
|
uWSGI
|
|
=====
|
|
|
|
.. sidebar:: further reading
|
|
|
|
- `systemd.unit`_
|
|
- `uWSGI Emperor`_
|
|
|
|
.. 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
|
|
============
|
|
|
|
.. _Tyrant mode:
|
|
https://uwsgi-docs.readthedocs.io/en/latest/Emperor.html#tyrant-mode-secure-multi-user-hosting
|
|
|
|
How uWSGI is implemented by distributors varies. The uWSGI project itself
|
|
recommends two methods:
|
|
|
|
1. `systemd.unit`_ template file as described here `One service per app in systemd`_:
|
|
|
|
There is one `systemd unit template`_ on the system installed and one `uwsgi
|
|
ini file`_ per uWSGI-app placed at dedicated locations. Take archlinux and a
|
|
``searxng.ini`` as example::
|
|
|
|
systemd template unit: /usr/lib/systemd/system/uwsgi@.service
|
|
contains: [Service]
|
|
ExecStart=/usr/bin/uwsgi --ini /etc/uwsgi/%I.ini
|
|
|
|
SearXNG application: /etc/uwsgi/searxng.ini
|
|
links to: /etc/uwsgi/apps-available/searxng.ini
|
|
|
|
The SearXNG app (template ``/etc/uwsgi/%I.ini``) can be maintained as known
|
|
from common systemd units:
|
|
|
|
.. code:: sh
|
|
|
|
$ systemctl enable uwsgi@searxng
|
|
$ systemctl start uwsgi@searxng
|
|
$ systemctl restart uwsgi@searxng
|
|
$ systemctl stop uwsgi@searxng
|
|
|
|
2. The `uWSGI Emperor`_ which fits for maintaining a large range of uwsgi
|
|
apps and there is a `Tyrant mode`_ to secure multi-user hosting.
|
|
|
|
The Emperor mode is a special uWSGI instance that will monitor specific
|
|
events. The Emperor mode (the 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 ``searxng.ini`` as example::
|
|
|
|
to install & start SearXNG instance create --> /etc/uwsgi.d/searxng.ini
|
|
to reload the instance edit timestamp --> touch /etc/uwsgi.d/searxng.ini
|
|
to stop instance remove ini --> rm /etc/uwsgi.d/searxng.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 in is the packaging of
|
|
plugins (if so, compare :ref:`install packages`) and what the default python
|
|
interpreter is (python2 vs. python3).
|
|
|
|
While archlinux does not start a uWSGI service by default, Fedora (RHEL) starts
|
|
a Emperor in `Tyrant mode`_ by default (you should have read :ref:`uWSGI Tyrant
|
|
mode pitfalls`). Worth to know; debian (ubuntu) follow a complete different
|
|
approach, read see :ref:`Debian's uWSGI layout`.
|
|
|
|
.. _Debian's uWSGI layout:
|
|
|
|
Debian's uWSGI layout
|
|
---------------------
|
|
|
|
.. _uwsgi.README.Debian:
|
|
https://salsa.debian.org/uwsgi-team/uwsgi/-/raw/debian/latest/debian/uwsgi.README.Debian
|
|
|
|
Be aware, Debian's uWSGI layout is quite different from the standard uWSGI
|
|
configuration. Your are familiar with :ref:`Debian's Apache layout`? .. they do a
|
|
similar thing for the uWSGI infrastructure. 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/searxng.ini /etc/uwsgi/apps-enabled/
|
|
|
|
More details can be found in the uwsgi.README.Debian_
|
|
(``/usr/share/doc/uwsgi/README.Debian.gz``). Some commands you should know on
|
|
Debian:
|
|
|
|
.. code:: none
|
|
|
|
Commands recognized by init.d script
|
|
====================================
|
|
|
|
You can issue to init.d script following commands:
|
|
* start | starts daemon
|
|
* stop | stops daemon
|
|
* reload | sends to daemon SIGHUP signal
|
|
* force-reload | sends to daemon SIGTERM signal
|
|
* restart | issues 'stop', then 'start' commands
|
|
* status | shows status of daemon instance (running/not running)
|
|
|
|
'status' command must be issued with exactly one argument: '<confname>'.
|
|
|
|
Controlling specific instances of uWSGI
|
|
=======================================
|
|
|
|
You could control specific instance(s) by issuing:
|
|
|
|
SYSTEMCTL_SKIP_REDIRECT=1 service uwsgi <command> <confname> <confname>...
|
|
|
|
where:
|
|
* <command> is one of 'start', 'stop' etc.
|
|
* <confname> is the name of configuration file (without extension)
|
|
|
|
For example, this is how instance for /etc/uwsgi/apps-enabled/hello.xml is
|
|
started:
|
|
|
|
SYSTEMCTL_SKIP_REDIRECT=1 service uwsgi start hello
|
|
|
|
|
|
.. _uWSGI maintenance:
|
|
|
|
uWSGI maintenance
|
|
=================
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: Ubuntu / debian
|
|
|
|
.. kernel-include:: $DOCS_BUILD/includes/searxng.rst
|
|
:start-after: START searxng uwsgi-description ubuntu-20.04
|
|
:end-before: END searxng uwsgi-description ubuntu-20.04
|
|
|
|
.. hotfix: a bug group-tab need this comment
|
|
|
|
.. group-tab:: Arch Linux
|
|
|
|
.. kernel-include:: $DOCS_BUILD/includes/searxng.rst
|
|
:start-after: START searxng uwsgi-description arch
|
|
:end-before: END searxng uwsgi-description arch
|
|
|
|
.. hotfix: a bug group-tab need this comment
|
|
|
|
.. group-tab:: Fedora / RHEL
|
|
|
|
.. kernel-include:: $DOCS_BUILD/includes/searxng.rst
|
|
:start-after: START searxng uwsgi-description fedora
|
|
:end-before: END searxng uwsgi-description fedora
|
|
|
|
|
|
.. _uwsgi setup:
|
|
|
|
uWSGI setup
|
|
===========
|
|
|
|
Create the configuration ini-file according to your distribution and restart the
|
|
uwsgi application. As shown below, the :ref:`installation scripts` installs by
|
|
default:
|
|
|
|
- a uWSGI setup that listens on a socket and
|
|
- enables :ref:`cache busting <static_use_hash>`.
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: Ubuntu / debian
|
|
|
|
.. kernel-include:: $DOCS_BUILD/includes/searxng.rst
|
|
:start-after: START searxng uwsgi-appini ubuntu-20.04
|
|
:end-before: END searxng uwsgi-appini ubuntu-20.04
|
|
|
|
.. hotfix: a bug group-tab need this comment
|
|
|
|
.. group-tab:: Arch Linux
|
|
|
|
.. kernel-include:: $DOCS_BUILD/includes/searxng.rst
|
|
:start-after: START searxng uwsgi-appini arch
|
|
:end-before: END searxng uwsgi-appini arch
|
|
|
|
.. hotfix: a bug group-tab need this comment
|
|
|
|
.. group-tab:: Fedora / RHEL
|
|
|
|
.. kernel-include:: $DOCS_BUILD/includes/searxng.rst
|
|
:start-after: START searxng uwsgi-appini fedora
|
|
:end-before: END searxng uwsgi-appini fedora
|
|
|
|
|
|
.. _uWSGI Tyrant mode pitfalls:
|
|
|
|
Pitfalls of the Tyrant mode
|
|
===========================
|
|
|
|
The implementation of the process owners and groups in the `Tyrant mode`_ is
|
|
somewhat unusual and requires special consideration. In `Tyrant mode`_ mode the
|
|
Emperor will run the vassal using the UID/GID of the vassal configuration file
|
|
(user and group of the app ``.ini`` file).
|
|
|
|
.. _#2099@uWSGI: https://github.com/unbit/uwsgi/issues/2099
|
|
.. _#752@uWSGI: https://github.com/unbit/uwsgi/pull/752
|
|
.. _#2425uWSGI: https://github.com/unbit/uwsgi/issues/2425
|
|
|
|
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 (see `#2099@uWSGI`_) the feature `#752@uWSGI`_ has been merged (on
|
|
Oct. 2014) to the master branch of uWSGI but had never been released; the last
|
|
major release is from Dec. 2013, since the there had been only bugfix releases
|
|
(see `#2425uWSGI`_). To shorten up:
|
|
|
|
**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
|
|
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.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::
|
|
|
|
$ groups searxng
|
|
searxng : searxng searxng-redis
|
|
|
|
To see the effective groups of the uwsgi process, you have to look at the status
|
|
of the process, by example::
|
|
|
|
$ 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
|
|
|
|
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:
|
|
...
|