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130 lines
4.3 KiB
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Docker compose requirements
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===========================
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Hardware considerations
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-----------------------
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You should make sure that your hardware (virtual or physical) is compatible with
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the latest Linux kernel. The minimal required memory and swap are:
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* When using antivirus (clamav):
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* 3GB of memory
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* 1GB of swap
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* When not using antivirus (clamav):
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* 1GB of memory
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* 1GB of swap
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Pick a distribution
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-------------------
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The mail server runs as a set of Docker containers. It is thus almost agnostic
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of the underlying operating system as long as a fairly recent Linux kernel is
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running and the Docker API (>= 1.11) is available.
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Because most of our tests run on Debian Jessie and Debian Stretch, we recommend
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one of these for the base system. Mailu should however be able to run on
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any of the `officially supported distributions`_.
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For the purpose of this guide, all examples are based on Debian Stretch. The
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differences with other system will hardly be noticeable however.
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.. _`officially supported distributions`: https://docs.docker.com/engine/installation/
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Install the distribution
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------------------------
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First, install Debian Stretch from the *netinstall* CD image. When installing,
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make sure that you either:
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- setup a root *ext4* partition,
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- or setup a root *btrfs* partition,
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- or leave enough unpartitionned space for a dedicated *ext4* or *btrfs*
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partition.
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If you chose to create a dedicated partition, simply mount it to
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``/var/lib/docker``. You could also create a separate partition (*ext4* is a
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sane default) and mount it to ``/mailu`` for storing e-mail data.
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Docker supports *AUFS* over *ext4* and *btrfs* as stable storage drivers.
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Other filesystems are supported such as *OverlayFS*. If you know what you are
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doing, you should go for it.
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Mailu uses Docker port forwarding from the host to make services
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available to external users. First, your host should have a public IP address
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configured (see ``/etc/network/interfaces``) or your router should
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forward connections to its internal IP address. Due to spam problems and
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reputation services, it
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is highly recommended that you use a dedicated IP address for your mail server
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and that you have a dedicated hostname with forward and reverse DNS entries
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for this IP address.
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Also, your host must not listen on ports ``25``, ``80``, ``110``, ``143``,
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``443``, ``465``, ``587``, ``993`` or ``995`` as these are used by Mailu
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services. Therefore, you should disable or uninstall any program that is
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listening on these ports (or have them listen on a different port). For
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instance, on a default Debian install:
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.. code-block:: bash
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apt-get autoremove --purge exim4 exim4-base
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Finally, Docker relies heavily on ``iptables`` for port forwardings. You
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should use ``iptables-persistent`` (or any equivalent tool on other
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systems) for managing persistent rules. If you were brave enough to switch to
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``nftables``, you will have to rollback until official support is released
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by Docker or setup your own rulesets.
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Install Docker
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--------------
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Mailu relies on some of the latest Docker features. Therefore, you should
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install Docker from the official repositories instead of your distribution
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ones.
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The Docker website is full of `detailed instructions`_
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about setting up a proper Docker install. Default configuration should be
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suited for Mailu.
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Additionally, you must install ``docker-compose`` by following the instructions
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from the `Docker website`_ if you plan on using the CompComposesoe flavor. Compose is a
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management tool for Docker, especially suited for multiple containers systems
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like Mailu.
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.. _`detailed instructions`: https://docs.docker.com/engine/installation/
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.. _`Docker website`: https://docs.docker.com/compose/
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Once everything is setup, you should be able to run the following commands
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(exact version numbers do not matter):
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.. code-block:: bash
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$ docker version
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Client:
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Version: 1.11.2
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API version: 1.23
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Go version: go1.6.2
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Git commit: b9f10c9
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Built: Sun Jun 5 23:17:55 2016
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OS/Arch: linux/amd64
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Server:
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Version: 1.11.1
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API version: 1.23
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Go version: go1.6.2
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Git commit: 5604cbe
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Built: Mon May 2 00:06:51 2016
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OS/Arch: linux/amd64
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$ docker-compose version
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docker-compose version 1.7.1, build 6c29830
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docker-py version: 1.8.1
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CPython version: 3.5.1
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OpenSSL version: OpenSSL 1.0.2h 3 May 2016
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