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.. _blog-lxcdev-202006:
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.. _lxcdev:
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=======================================
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==============================
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Developing in Linux containers [202006]
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Developing in Linux Containers
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=======================================
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==============================
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.. _LXC: https://linuxcontainers.org/lxc/introduction/
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.. _LXC: https://linuxcontainers.org/lxc/introduction/
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In this article we will show, how you can make use of Linux Containers (LXC_) in
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*distributed and heterogeneous development cycles* (TL;DR; jump to the
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:ref:`lxcdev summary`).
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.. sidebar:: Audience
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.. sidebar:: Audience
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This blog post is written for experienced admins and developers / readers
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This blog post is written for experienced admins and developers. Readers
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should have a serious meaning about: *distributed*, *merge* and *linux
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should have a serious meaning about the terms: *distributed*, *merge* and
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container*.
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*linux container*.
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.. contents:: Contents
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.. contents:: Contents
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:depth: 2
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:depth: 2
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:local:
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:local:
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:backlinks: entry
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:backlinks: entry
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In PR :PR:`1803` we added a lot of scripts to Searx's boilerplate. In this blog
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post I will show you, how you can make use of them in *distributed and
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heterogeneous development cycles* (TL;DR; jump to the :ref:`blog-lxcdev-202006
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abstract`).
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Motivation
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Motivation
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==========
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==========
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Normally in our development cycle, we edit the sources and run some test and/or
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Usually in our development cycle, we edit the sources and run some test and/or
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builds by using ``make`` before we commit. This cycle is simple and perfect but
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builds by using ``make`` :ref:`[ref] <makefile>` before we commit. This cycle
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might fail in some aspects we should not overlook.
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is simple and perfect but might fail in some aspects we should not overlook.
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The environment in which we run all our development processes matters!
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**The environment in which we run all our development processes matters!**
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The :ref:`makefile` and the :ref:`make install` encapsulate a lot for us, but they
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The :ref:`makefile` and the :ref:`make install` encapsulate a lot for us, but
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do not have access to all prerequisites. For example, there may have
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they do not have access to all prerequisites. For example, there may have
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dependencies on packages that are installed on the developer's desktop, but
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dependencies on packages that are installed on the developer's desktop, but
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usually are not preinstalled on a server or client system. Another examples
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usually are not preinstalled on a server or client system. Another example is;
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are; settings have been made to the software on the developer's host that would
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settings have been made to the software on developer's desktop that would never
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never be set on a *production* system.
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be set on a *production* system.
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*Linux Containers* (LXC_) are isolate environments and not to mix up on
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**Linux Containers are isolate environments and not to mix up all the
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developer's all the prerequisites of all the projects he contribute to, is
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prerequisites from various projects on developer's desktop is always a good
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always a good choice.
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choice.**
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The scripts from PR :PR:`1803` can divide in those to install and maintain
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The scripts from :ref:`searx_utils` can divide in those to install and maintain
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software:
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software:
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- :ref:`searx.sh`
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- :ref:`searx.sh`
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@@ -50,8 +50,10 @@ software:
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- :ref:`morty.sh`
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- :ref:`morty.sh`
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and the script :ref:`lxc.sh`, with we can scale our installation, maintenance or
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and the script :ref:`lxc.sh`, with we can scale our installation, maintenance or
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even development tasks over a stack of containers, what we call: *Searx's lxc
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even development tasks over a stack of isolated containers / what we call the:
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suite*.
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**searxNG LXC suite**
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Gentlemen, start your engines!
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Gentlemen, start your engines!
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==============================
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==============================
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@@ -141,18 +143,18 @@ and once for the content sanitizer (content proxy morty):
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...
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...
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INFO: got 200 from http://10.174.184.156/morty/
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INFO: got 200 from http://10.174.184.156/morty/
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.. sidebar:: Fully functional searx suite
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.. sidebar:: Fully functional searXNG suite
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From here on you have a fully functional searx suite running with bot blocker
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From here on you have a fully functional searXNG suite running with bot
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(filtron) and Web content sanitizer (content proxy morty) needed for a
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blocker (filtron) and WEB content sanitizer (content proxy morty), both are
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*privacy protecting* search engine.
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needed for a *privacy protecting* search engine.
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On your system, the IP of your ``searx-archlinux`` container differs from
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On your system, the IP of your ``searx-archlinux`` container differs from
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http://10.174.184.156/searx, just open the URL reported in your installation
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http://10.174.184.156/searx, just open the URL reported in your installation
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protocol in your WEB browser from the desktop to test the instance from outside
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protocol in your WEB browser from the desktop to test the instance from outside
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of the container.
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of the container.
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In such a searx suite admins can maintain and access the debug log of the
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In such a searXNG suite admins can maintain and access the debug log of the
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different services quite easy.
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different services quite easy.
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.. _working in containers:
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.. _working in containers:
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@@ -176,7 +178,7 @@ searx-archlinux``:
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/share/searx
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/share/searx
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The prompt ``[root@searx-archlinux ...]`` signals, that you are the root user in
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The prompt ``[root@searx-archlinux ...]`` signals, that you are the root user in
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the searx-container. To debug the running searx instance use:
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the searx-container. To debug the running searXNG instance use:
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.. tabs::
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.. tabs::
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@@ -192,8 +194,8 @@ the searx-container. To debug the running searx instance use:
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Back in the browser on your desktop open the service http://10.174.184.156/searx
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Back in the browser on your desktop open the service http://10.174.184.156/searx
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and run your application tests while the debug log is shown in the terminal from
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and run your application tests while the debug log is shown in the terminal from
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above. You can stop monitoring using ``CTRL-C``, this also disables the *"debug
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above. You can stop monitoring using ``CTRL-C``, this also disables the *"debug
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option"* in searx's settings file and restarts the searx uwsgi application. To
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option"* in searXNG's settings file and restarts the searXNG uwsgi application.
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debug services from filtron and morty analogous use:
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To debug services from filtron and morty analogous use:
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.. tabs::
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.. tabs::
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@@ -250,18 +252,18 @@ user ``searx`` in the ``searx-archlinux`` container and the python *virtualenv*
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Wrap production into developer suite
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Wrap production into developer suite
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====================================
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====================================
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In this section we will see how to change the *"Fully functional searx suite"*
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In this section we will see how to change the *"Fully functional searXNG suite"*
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from a LXC container (which is quite ready for production) into a developer
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from a LXC container (which is quite ready for production) into a developer
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suite. For this, we have to keep an eye on the :ref:`installation basic`:
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suite. For this, we have to keep an eye on the :ref:`installation basic`:
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- searx setup in: ``/etc/searx/settings.yml``
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- searXNG setup in: ``/etc/searx/settings.yml``
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- searx user's home: ``/usr/local/searx``
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- searXNG user's home: ``/usr/local/searx``
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- virtualenv in: ``/usr/local/searx/searx-pyenv``
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- virtualenv in: ``/usr/local/searx/searx-pyenv``
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- searx software in: ``/usr/local/searx/searx-src``
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- searXNG software in: ``/usr/local/searx/searx-src``
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The searx software is a clone of the ``git_url`` (see :ref:`settings global`) and
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The searXNG software is a clone of the ``git_url`` (see :ref:`settings global`)
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the working tree is checked out from the ``git_branch``. With the use of the
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and the working tree is checked out from the ``git_branch``. With the use of
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:ref:`searx.sh` the searx service was installed as :ref:`uWSGI application
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the :ref:`searx.sh` the searx service was installed as :ref:`uWSGI application
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<searx uwsgi>`. To maintain this service, we can use ``systemctl`` (compare
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<searx uwsgi>`. To maintain this service, we can use ``systemctl`` (compare
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:ref:`service architectures on distributions <uwsgi configuration>`).
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:ref:`service architectures on distributions <uwsgi configuration>`).
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@@ -292,7 +294,7 @@ least you should attend the settings of ``uid``, ``chdir``, ``env`` and
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If you have read the :ref:`"Good to know section" <lxc.sh>` you remember, that
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If you have read the :ref:`"Good to know section" <lxc.sh>` you remember, that
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each container shares the root folder of the repository and the command
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each container shares the root folder of the repository and the command
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``utils/lxc.sh cmd`` handles relative path names **transparent**. To wrap the
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``utils/lxc.sh cmd`` handles relative path names **transparent**. To wrap the
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searx installation into a developer one, we simple have to create a smylink to
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searXNG installation into a developer one, we simple have to create a smylink to
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the **transparent** reposetory from the desktop. Now lets replace the
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the **transparent** reposetory from the desktop. Now lets replace the
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repository at ``searx-src`` in the container with the working tree from outside
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repository at ``searx-src`` in the container with the working tree from outside
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of the container:
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of the container:
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@@ -330,7 +332,7 @@ daily usage:
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.. group-tab:: desktop
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.. group-tab:: desktop
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To *inspect* the searx instance (already described above):
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To *inspect* the searXNG instance (already described above):
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.. code:: sh
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.. code:: sh
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@@ -358,12 +360,12 @@ daily usage:
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$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
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$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
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make docs.html
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make docs.html
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.. _blog-lxcdev-202006 abstract:
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.. _lxcdev summary:
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Abstract
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Summary
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========
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=======
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We build up a fully functional searx suite in a archlinux container:
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We build up a fully functional searXNG suite in a archlinux container:
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.. code:: sh
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.. code:: sh
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@@ -395,7 +397,8 @@ the container :
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$ ln -s /share/searx/ /usr/local/searx/searx-src
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$ ln -s /share/searx/ /usr/local/searx/searx-src
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$ systemctl restart uwsgi@searx
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$ systemctl restart uwsgi@searx
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To get remarks from the suite of the archlinux container we can use:
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To get information about the searxNG suite in the archlinux container we can
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use:
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.. tabs::
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.. tabs::
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