.. _snap: https://snapcraft.io
.. _snapcraft LXD: https://snapcraft.io/lxd
.. _LXC/LXD Image Server: https://uk.images.linuxcontainers.org/
.. _LXC: https://linuxcontainers.org/lxc/introduction/
.. _LXD: https://linuxcontainers.org/lxd/introduction/
.. _`LXD@github`: https://github.com/lxc/lxd
.. _archlinux: https://www.archlinux.org/
.. _lxc.sh:
================
``utils/lxc.sh``
================
With the use of *Linux Containers* (LXC_) we can scale our tasks over a stack of
containers, what we call the: *lxc suite*. The :ref:`lxc-searxng.env` is
loaded by default, every time you start the ``lxc.sh`` script (*you do not need
to care about*).
.. sidebar:: further reading
- snap_, `snapcraft LXD`_
- LXC_, LXD_
- `LXC/LXD Image Server`_
- `LXD@github`_
.. contents::
:depth: 2
:local:
:backlinks: entry
.. _lxd install:
Install LXD
===========
Before you can start with containers, you need to install and initiate LXD_
once::
$ snap install lxd
$ lxd init --auto
To make use of the containers from the *SearXNG suite*, you have to build the
:ref:`LXC suite containers <lxc.sh help>` initial. But be warned, **this might
take some time**::
$ sudo -H ./utils/lxc.sh build
.. sidebar:: hint
If you have issues with the internet connectivity of your containers read
section :ref:`internet connectivity docker`.
A cup of coffee later, your LXC suite is build up and you can run whatever task
you want / in a selected or even in all :ref:`LXC suite containers <lxc.sh
help>`.
.. _internet connectivity docker:
Internet Connectivity & Docker
------------------------------
.. sidebar:: further read
- `Docker blocking network of existing LXC containers <https://github.com/docker/for-linux/issues/103>`__
- `Docker and IPtables (fralef.me) <https://fralef.me/docker-and-iptables.html>`__
- `Docker and iptables (docker.com) <https://docs.docker.com/network/iptables/#docker-on-a-router/>`__
There is a conflict in the ``iptables`` setup of Docker & LXC. If you have
docker installed, you may find that the internet connectivity of your LXD
containers no longer work.
Whenever docker is started (reboot) it sets the iptables policy for the
``FORWARD`` chain to ``DROP`` `[ref]
<https://docs.docker.com/network/iptables/#docker-on-a-router>`__::
$ sudo -H iptables-save | grep FORWARD
:FORWARD ACCEPT [7048:7851230]
:FORWARD DROP [7048:7851230]
A handy solution of this problem might be to reset the policy for the
``FORWARD`` chain after the network has been initialized. For this create a
file in the ``if-up`` section of the network (``/etc/network/if-up.d/iptable``)
and insert the following lines::
#!/bin/sh
iptables -F FORWARD
iptables -P FORWARD ACCEPT
Don't forget to set the execution bit::
sudo chmod ugo+x /etc/network/if-up.d/iptable
Reboot your system and check the iptables rules::
$ sudo -H iptables-save | grep FORWARD
:FORWARD ACCEPT [7048:7851230]
:FORWARD ACCEPT [7048:7851230]
.. _searxng lxc suite:
SearXNG LXC suite
=================
The intention of the *SearXNG LXC suite* is to build up a suite of containers
for development tasks or :ref:`buildhosts <Setup SearXNG buildhost>` with a very
small set of simple commands. At the end of the ``--help`` output the SearXNG
suite from the :ref:`lxc-searxng.env` is introduced::
$ sudo -H ./utils/lxc.sh --help
...
LXC suite: searxng
Suite includes installation of SearXNG
images: ubu2004 ubu2204 fedora35 archlinux
containers: searxng-ubu2004 searxng-ubu2204 searxng-fedora35 searxng-archlinux
As shown above there are images and containers build up on this images. To show
more info about the containers in the *SearXNG LXC suite* call ``show suite``.
If this is the first time you make use of the SearXNG LXC suite, no containers
are installed and the output is::
$ sudo -H ./utils/lxc.sh show suite
LXC suite (searxng-*)
=====================
+------+-------+------+------+------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+------+-------+------+------+------+-----------+
WARN: container searxng-ubu2004 does not yet exists
WARN: container searxng-ubu2204 does not yet exists
WARN: container searxng-fedora35 does not yet exists
WARN: container searxng-archlinux does not yet exists
If you do not want to run a command or a build in all containers, **you can
build just one**. Here by example in the container that is build upon the
*archlinux* image::
$ sudo -H ./utils/lxc.sh build searxng-archlinux
$ sudo -H ./utils/lxc.sh cmd searxng-archlinux pwd
Otherwise, to apply a command to all containers you can use::
$ sudo -H ./utils/lxc.sh build
$ sudo -H ./utils/lxc.sh cmd -- ls -la .
Running commands
----------------
**Inside containers, you can run scripts** from the :ref:`toolboxing` or run
what ever command you need. By example, to start a bash use::
$ sudo -H ./utils/lxc.sh cmd searxng-archlinux bash
INFO: [searxng-archlinux] bash
[root@searxng-archlinux SearXNG]#
.. _Good to know:
Good to know
------------
Each container shares the root folder of the repository and the command
``utils/lxc.sh cmd`` **handle relative path names transparent**::
$ pwd
/share/SearXNG
$ sudo -H ./utils/lxc.sh cmd searxng-archlinux pwd
INFO: [searxng-archlinux] pwd
/share/SearXNG
The path ``/share/SearXNG`` will be different on your HOST system. The commands
in the container are executed by the ``root`` inside of the container. Compare
output of::
$ ls -li Makefile
47712402 -rw-rw-r-- 1 markus markus 2923 Apr 19 13:52 Makefile
$ sudo -H ./utils/lxc.sh cmd searxng-archlinux ls -li Makefile
INFO: [searxng-archlinux] ls -li Makefile
47712402 -rw-rw-r-- 1 root root 2923 Apr 19 11:52 Makefile
...
Since the path ``/share/SearXNG`` of the HOST system is wrapped into the
container under the same name, the shown ``Makefile`` (inode ``47712402``) in
the output is always the identical ``/share/SearXNG/Makefile`` from the HOST
system. In the example shown above the owner of the path in the container is
the ``root`` user of the container (and the timezone in the container is
different to HOST system).
.. _lxc.sh install suite:
Install suite
-------------
.. sidebar:: further read
- :ref:`working in containers`
- :ref:`FORCE_TIMEOUT <FORCE_TIMEOUT>`
To install the complete :ref:`SearXNG suite <lxc-searxng.env>` into **all** LXC_
containers leave the container argument empty and run::
$ sudo -H ./utils/lxc.sh build
$ sudo -H ./utils/lxc.sh install suite
To *build & install* suite only in one container you can use by example::
$ sudo -H ./utils/lxc.sh build searxng-archlinux
$ sudo -H ./utils/lxc.sh install suite searxng-archlinux
The command above installs a SearXNG suite (see :ref:`installation scripts`).
To :ref:`install a nginx <installation nginx>` reverse proxy (or alternatively
use :ref:`apache <installation apache>`)::
$ sudo -H ./utils/lxc.sh cmd -- FORCE_TIMEOUT=0 ./utils/searxng.sh install nginx
Same operation just in one container of the suite::
$ sudo -H ./utils/lxc.sh cmd searxng-archlinux FORCE_TIMEOUT=0 ./utils/searxng.sh install nginx
The :ref:`FORCE_TIMEOUT <FORCE_TIMEOUT>` environment is set to zero to run the
script without user interaction.
To get the IP (URL) of the SearXNG service in the containers use ``show suite``
command. To test instances from containers just open the URLs in your
WEB-Browser::
$ sudo ./utils/lxc.sh show suite | grep SEARXNG_URL
[searxng-ubu2110] SEARXNG_URL : http://n.n.n.170/searxng
[searxng-ubu2004] SEARXNG_URL : http://n.n.n.160/searxng
[searxnggfedora35] SEARXNG_URL : http://n.n.n.150/searxng
[searxng-archlinux] SEARXNG_URL : http://n.n.n.140/searxng
Clean up
--------
If there comes the time you want to **get rid off all** the containers and
**clean up local images** just type::
$ sudo -H ./utils/lxc.sh remove
$ sudo -H ./utils/lxc.sh remove images
.. _Setup SearXNG buildhost:
Setup SearXNG buildhost
=======================
You can **install the SearXNG buildhost environment** into one or all containers.
The installation procedure to set up a :ref:`build host<buildhosts>` takes its
time. Installation in all containers will take more time (time for another cup
of coffee). ::
sudo -H ./utils/lxc.sh cmd -- ./utils/searxng.sh install buildhost
To build (live) documentation inside a archlinux_ container::
sudo -H ./utils/lxc.sh cmd searxng-archlinux make docs.clean docs.live
...
[I 200331 15:00:42 server:296] Serving on http://0.0.0.0:8080
To get IP of the container and the port number *live docs* is listening::
$ sudo ./utils/lxc.sh show suite | grep docs.live
...
[searxng-archlinux] INFO: (eth0) docs.live: http://n.n.n.140:8080/
.. _lxc.sh help:
Command Help
============
The ``--help`` output of the script is largely self-explanatory:
.. program-output:: ../utils/lxc.sh --help
.. _lxc-searxng.env:
SearXNG suite config
====================
The SearXNG suite is defined in the file :origin:`utils/lxc-searxng.env`:
.. literalinclude:: ../../utils/lxc-searxng.env
:language: bash
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