contrib/docker/apache-server/README.rst
author David Demelier <markand@malikania.fr>
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====================
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Apache Docker Server
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====================
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This directory contains code for running a Mercurial hgweb server via
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mod_wsgi with the Apache HTTP Server inside a Docker container.
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.. important::
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   This container is intended for testing purposes only: it is
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   **not** meant to be suitable for production use.
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Building Image
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==============
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The first step is to build a Docker image containing Apache and mod_wsgi::
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  $ docker build -t hg-apache .
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.. important::
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   You should rebuild the image whenever the content of this directory
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   changes. Rebuilding after pulling or when you haven't run the container
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   in a while is typically a good idea.
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Running the Server
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==================
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To run the container, you'll execute something like::
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  $ docker run --rm -it -v `pwd`/../../..:/var/hg/source -p 8000:80 hg-apache
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If you aren't a Docker expert:
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* ``--rm`` will remove the container when it stops (so it doesn't clutter
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  your system)
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* ``-i`` will launch the container in interactive mode so stdin is attached
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* ``-t`` will allocate a pseudo TTY
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* ``-v src:dst`` will mount the host filesystem at ``src`` into ``dst``
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  in the container. In our example, we assume you are running from this
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  directory and use the source code a few directories up.
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* ``-p 8000:80`` will publish port ``80`` on the container to port ``8000``
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  on the host, allowing you to access the HTTP server on the host interface.
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* ``hg-apache`` is the container image to run. This should correspond to what
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  we build with ``docker build``.
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.. important::
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   The container **requires** that ``/var/hg/source`` contain the Mercurial
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   source code.
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   Upon start, the container will attempt an install of the source in that
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   directory. If the architecture of the host machine doesn't match that of
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   the Docker host (e.g. when running Boot2Docker under OS X), Mercurial's
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   Python C extensions will fail to run. Be sure to ``make clean`` your
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   host's source tree before mounting it in the container to avoid this.
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When starting the container, you should see some start-up actions (including
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a Mercurial install) and some output saying Apache has started::
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Now if you load ``http://localhost:8000/`` (or whatever interface Docker
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is using), you should see hgweb running!
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For your convenience, we've created an empty repository available at
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``/repo``. Feel free to populate it with ``hg push``.
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Customizing the Server
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======================
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By default, the Docker container installs a basic hgweb config and an
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empty dummy repository. It also uses some reasonable defaults for
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mod_wsgi.
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Customizing the WSGI Dispatcher And Mercurial Config
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----------------------------------------------------
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By default, the Docker environment installs a custom ``hgweb.wsgi``
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file (based on the example in ``contrib/hgweb.wsgi``). The file
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is installed into ``/var/hg/htdocs/hgweb.wsgi``.
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A default hgweb configuration file is also installed. The ``hgwebconfig``
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file from this directory is installed into ``/var/hg/htdocs/config``.
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You have a few options for customizing these files.
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The simplest is to hack up ``hgwebconfig`` and ``entrypoint.sh`` in
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this directory and to rebuild the Docker image. This has the downside
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that the Mercurial working copy is modified and you may accidentally
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commit unwanted changes.
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The next simplest is to copy this directory somewhere, make your changes,
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then rebuild the image. No working copy changes involved.
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The preferred solution is to mount a host file into the container and
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overwrite the built-in defaults.
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For example, say we create a custom hgweb config file in ``~/hgweb``. We
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can start the container like so to install our custom config file::
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  $ docker run -v ~/hgweb:/var/hg/htdocs/config ...
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You can do something similar to install a custom WSGI dispatcher::
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  $ docker run -v ~/hgweb.wsgi:/var/hg/htdocs/hgweb.wsgi ...
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Managing Repositories
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---------------------
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Repositories are served from ``/var/hg/repos`` by default. This directory
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is configured as a Docker volume. This means you can mount an existing
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data volume container in the container so repository data is persisted
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across container invocations. See
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https://docs.docker.com/userguide/dockervolumes/ for more.
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Alternatively, if you just want to perform lightweight repository
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manipulation, open a shell in the container::
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  $ docker exec -it <container> /bin/bash
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Then run ``hg init``, etc to manipulate the repositories in ``/var/hg/repos``.
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mod_wsgi Configuration Settings
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-------------------------------
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mod_wsgi settings can be controlled with the following environment
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variables.
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WSGI_PROCESSES
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   Number of WSGI processes to run.
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WSGI_THREADS
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   Number of threads to run in each WSGI process
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WSGI_MAX_REQUESTS
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   Maximum number of requests each WSGI process may serve before it is
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   reaped.
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See https://code.google.com/p/modwsgi/wiki/ConfigurationDirectives#WSGIDaemonProcess
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for more on these settings.
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.. note::
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   The default is to use 1 thread per process. The reason is that Mercurial
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   doesn't perform well in multi-threaded mode due to the GIL. Most people
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   run a single thread per process in production for this reason, so that's
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   what we default to.