mirror of
https://github.com/searxng/searxng.git
synced 2024-12-11 20:06:28 +00:00
420 lines
12 KiB
ReStructuredText
420 lines
12 KiB
ReStructuredText
.. _lxcdev:
|
|
|
|
==============================
|
|
Developing in Linux Containers
|
|
==============================
|
|
|
|
.. _LXC: https://linuxcontainers.org/lxc/introduction/
|
|
|
|
In this article we will show, how you can make use of Linux Containers (LXC_) in
|
|
*distributed and heterogeneous development cycles* (TL;DR; jump to the
|
|
:ref:`lxcdev summary`).
|
|
|
|
.. sidebar:: Audience
|
|
|
|
This blog post is written for experienced admins and developers. Readers
|
|
should have a serious meaning about the terms: *distributed*, *merge* and
|
|
*linux container*.
|
|
|
|
.. contents:: Contents
|
|
:depth: 2
|
|
:local:
|
|
:backlinks: entry
|
|
|
|
|
|
Motivation
|
|
==========
|
|
|
|
Usually in our development cycle, we edit the sources and run some test and/or
|
|
builds by using ``make`` :ref:`[ref] <makefile>` before we commit. This cycle
|
|
is simple and perfect but might fail in some aspects we should not overlook.
|
|
|
|
**The environment in which we run all our development processes matters!**
|
|
|
|
The :ref:`makefile` and the :ref:`make install` encapsulate a lot for us, but
|
|
they do not have access to all prerequisites. For example, there may have
|
|
dependencies on packages that are installed on the developer's desktop, but
|
|
usually are not preinstalled on a server or client system. Another example is;
|
|
settings have been made to the software on developer's desktop that would never
|
|
be set on a *production* system.
|
|
|
|
**Linux Containers are isolate environments and not to mix up all the
|
|
prerequisites from various projects on developer's desktop is always a good
|
|
choice.**
|
|
|
|
The scripts from :ref:`searx_utils` can divide in those to install and maintain
|
|
software:
|
|
|
|
- :ref:`searx.sh`
|
|
- :ref:`filtron.sh`
|
|
- :ref:`morty.sh`
|
|
|
|
and the script :ref:`lxc.sh`, with we can scale our installation, maintenance or
|
|
even development tasks over a stack of isolated containers / what we call the:
|
|
|
|
**SearXNG LXC suite**
|
|
|
|
.. hint::
|
|
|
|
If you see any problems with the internet connectivity of your
|
|
containers read section :ref:`internet connectivity docker`.
|
|
|
|
|
|
Gentlemen, start your engines!
|
|
==============================
|
|
|
|
.. _LXD: https://linuxcontainers.org/lxd/introduction/
|
|
.. _archlinux: https://www.archlinux.org/
|
|
|
|
Before you can start with containers, you need to install and initiate LXD_
|
|
once:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ snap install lxd
|
|
$ lxd init --auto
|
|
|
|
And you need to clone from origin or if you have your own fork, clone from your
|
|
fork:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ cd ~/Downloads
|
|
$ git clone https://github.com/searxng/searxng.git searxng
|
|
$ cd searxng
|
|
|
|
The :ref:`lxc-searx.env` consists of several images, see ``export
|
|
LXC_SUITE=(...`` near by :origin:`utils/lxc-searx.env#L19`. For this blog post
|
|
we exercise on a archlinux_ image. The container of this image is named
|
|
``searx-archlinux``. Lets build the container, but be sure that this container
|
|
does not already exists, so first lets remove possible old one:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh remove searx-archlinux
|
|
$ sudo -H ./utils/lxc.sh build searx-archlinux
|
|
|
|
.. sidebar:: The ``searx-archlinux`` container
|
|
|
|
is the base of all our exercises here.
|
|
|
|
In this container we install all services :ref:`including searx, morty & filtron
|
|
<lxc.sh install suite>` in once:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh install suite searx-archlinux
|
|
|
|
To proxy HTTP from filtron and morty in the container to the outside of the
|
|
container, install nginx into the container. Once for the bot blocker filtron:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
./utils/filtron.sh nginx install
|
|
...
|
|
INFO: got 429 from http://10.174.184.156/searx
|
|
|
|
and once for the content sanitizer (content proxy morty):
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
./utils/morty.sh nginx install
|
|
...
|
|
INFO: got 200 from http://10.174.184.156/morty/
|
|
|
|
.. sidebar:: Fully functional SearXNG suite
|
|
|
|
From here on you have a fully functional SearXNG suite running with bot
|
|
blocker (filtron) and WEB content sanitizer (content proxy morty), both are
|
|
needed for a *privacy protecting* search engine.
|
|
|
|
On your system, the IP of your ``searx-archlinux`` container differs from
|
|
http://10.174.184.156/searx, just open the URL reported in your installation
|
|
protocol in your WEB browser from the desktop to test the instance from outside
|
|
of the container.
|
|
|
|
In such a earXNG suite admins can maintain and access the debug log of the
|
|
different services quite easy.
|
|
|
|
.. _working in containers:
|
|
|
|
In containers, work as usual
|
|
============================
|
|
|
|
Usually you open a root-bash using ``sudo -H bash``. In case of LXC containers
|
|
open the root-bash in the container using ``./utils/lxc.sh cmd
|
|
searx-archlinux``:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux bash
|
|
INFO: [searx-archlinux] bash
|
|
[root@searx-archlinux searx]# pwd
|
|
/share/searxng
|
|
|
|
The prompt ``[root@searx-archlinux ...]`` signals, that you are the root user in
|
|
the searx-container. To debug the running SearXNG instance use:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: root@searx-archlinux
|
|
|
|
.. code:: sh
|
|
|
|
$ ./utils/searx.sh inspect service
|
|
...
|
|
use [CTRL-C] to stop monitoring the log
|
|
...
|
|
|
|
Back in the browser on your desktop open the service http://10.174.184.156/searx
|
|
and run your application tests while the debug log is shown in the terminal from
|
|
above. You can stop monitoring using ``CTRL-C``, this also disables the *"debug
|
|
option"* in SearXNG's settings file and restarts the SearXNG uwsgi application.
|
|
To debug services from filtron and morty analogous use:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: root@searx-archlinux
|
|
|
|
.. code:: sh
|
|
|
|
$ ./utils/filtron.sh inspect service
|
|
$ ./utils/morty.sh inspect service
|
|
|
|
Another point we have to notice is that each service (:ref:`SearXNG <searx.sh>`,
|
|
:ref:`filtron <filtron.sh>` and :ref:`morty <morty.sh>`) runs under dedicated
|
|
system user account with the same name (compare :ref:`create searxng user`). To
|
|
get a shell from theses accounts, simply call one of the scripts:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: root@searx-archlinux
|
|
|
|
.. code:: sh
|
|
|
|
$ ./utils/searx.sh shell
|
|
$ ./utils/filtron.sh shell
|
|
$ ./utils/morty.sh shell
|
|
|
|
To get in touch, open a shell from the service user (searx@searx-archlinux):
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
./utils/searx.sh shell
|
|
// exit with [CTRL-D]
|
|
(searx-pyenv) [searx@searx-archlinux ~]$ ...
|
|
|
|
The prompt ``[searx@searx-archlinux]`` signals that you are logged in as system
|
|
user ``searx`` in the ``searx-archlinux`` container and the python *virtualenv*
|
|
``(searx-pyenv)`` environment is activated.
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: searx@searx-archlinux
|
|
|
|
.. code:: sh
|
|
|
|
(searx-pyenv) [searx@searx-archlinux ~]$ pwd
|
|
/usr/local/searx
|
|
|
|
|
|
|
|
Wrap production into developer suite
|
|
====================================
|
|
|
|
In this section we will see how to change the *"Fully functional SearXNG suite"*
|
|
from a LXC container (which is quite ready for production) into a developer
|
|
suite. For this, we have to keep an eye on the :ref:`installation basic`:
|
|
|
|
- SearXNG setup in: ``/etc/searxng/settings.yml``
|
|
- SearXNG user's home: ``/usr/local/searx``
|
|
- virtualenv in: ``/usr/local/searx/searx-pyenv``
|
|
- SearXNG software in: ``/usr/local/searx/searx-src``
|
|
|
|
With the use of the :ref:`searx.sh` the SearXNG service was installed as
|
|
:ref:`uWSGI application <searxng uwsgi>`. To maintain this service, we can use
|
|
``systemctl`` (compare :ref:`service architectures on distributions <uwsgi
|
|
configuration>`).
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
systemctl stop uwsgi@searx
|
|
|
|
With the command above, we stopped the SearXNG uWSGI-App in the archlinux
|
|
container.
|
|
|
|
The uWSGI-App for the archlinux dsitros is configured in
|
|
:origin:`utils/templates/etc/uwsgi/apps-archlinux/searxng.ini`, from where at
|
|
least you should attend the settings of ``uid``, ``chdir``, ``env`` and
|
|
``http``::
|
|
|
|
env = SEARXNG_SETTINGS_PATH=/etc/searxng/settings.yml
|
|
http = 127.0.0.1:8888
|
|
|
|
chdir = /usr/local/searx/searx-src/searx
|
|
virtualenv = /usr/local/searx/searx-pyenv
|
|
pythonpath = /usr/local/searx/searx-src
|
|
|
|
If you have read the :ref:`"Good to know section" <lxc.sh>` you remember, that
|
|
each container shares the root folder of the repository and the command
|
|
``utils/lxc.sh cmd`` handles relative path names **transparent**. To wrap the
|
|
SearXNG installation into a developer one, we simple have to create a smylink to
|
|
the **transparent** reposetory from the desktop. Now lets replace the
|
|
repository at ``searx-src`` in the container with the working tree from outside
|
|
of the container:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: container becomes a developer suite
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
mv /usr/local/searx/searx-src /usr/local/searx/searx-src.old
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
ln -s /share/searx/ /usr/local/searx/searx-src
|
|
|
|
Now we can develop as usual in the working tree of our desktop system. Every
|
|
time the software was changed, you have to restart the SearXNG service (in the
|
|
conatiner):
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
systemctl restart uwsgi@searx
|
|
|
|
|
|
Remember: :ref:`working in containers` .. here are just some examples from my
|
|
daily usage:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
To *inspect* the SearXNG instance (already described above):
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
./utils/searx.sh inspect service
|
|
|
|
Run :ref:`makefile`, e.g. to test inside the container:
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
make test
|
|
|
|
To install all prerequisites needed for a :ref:`buildhosts`:
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
./utils/searx.sh install buildhost
|
|
|
|
To build the docs on a buildhost :ref:`buildhosts`:
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh cmd searx-archlinux \
|
|
make docs.html
|
|
|
|
.. _lxcdev summary:
|
|
|
|
Summary
|
|
=======
|
|
|
|
We build up a fully functional SearXNG suite in a archlinux container:
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh install suite searx-archlinux
|
|
|
|
To access HTTP from the desktop we installed nginx for the services inside the
|
|
conatiner:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: [root@searx-archlinux]
|
|
|
|
.. code:: sh
|
|
|
|
$ ./utils/filtron.sh nginx install
|
|
$ ./utils/morty.sh nginx install
|
|
|
|
To wrap the suite into a developer one, we created a symbolic link to the
|
|
repository which is shared **transparent** from the desktop's file system into
|
|
the container :
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: [root@searx-archlinux]
|
|
|
|
.. code:: sh
|
|
|
|
$ mv /usr/local/searx/searx-src /usr/local/searx/searx-src.old
|
|
$ ln -s /share/searx/ /usr/local/searx/searx-src
|
|
$ systemctl restart uwsgi@searx
|
|
|
|
To get information about the searxNG suite in the archlinux container we can
|
|
use:
|
|
|
|
.. tabs::
|
|
|
|
.. group-tab:: desktop
|
|
|
|
.. code:: sh
|
|
|
|
$ sudo -H ./utils/lxc.sh show suite searx-archlinux
|
|
...
|
|
[searx-archlinux] INFO: (eth0) filtron: http://10.174.184.156:4004/ http://10.174.184.156/searx
|
|
[searx-archlinux] INFO: (eth0) morty: http://10.174.184.156:3000/
|
|
[searx-archlinux] INFO: (eth0) docs.live: http://10.174.184.156:8080/
|
|
[searx-archlinux] INFO: (eth0) IPv6: http://[fd42:573b:e0b3:e97e:216:3eff:fea5:9b65]
|
|
...
|
|
|