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