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:title: Automatically Start Containers
:description: How to generate scripts for upstart, systemd, etc.
:keywords: systemd, upstart, supervisor, docker, documentation, host integration
Automatically Start Containers
==============================
You can use your Docker containers with process managers like ``upstart``,
``systemd`` and ``supervisor``.
Introduction
------------
If you want a process manager to manage your containers you will need to run
the docker daemon with the ``-r=false`` so that docker will not automatically
restart your containers when the host is restarted.
When you have finished setting up your image and are happy with your
running container, you can then attach a process manager to manage
it. When your run ``docker start -a`` docker will automatically attach
to the running container, or start it if needed and forward all signals
so that the process manager can detect when a container stops and correctly
restart it.
Here are a few sample scripts for systemd and upstart to integrate with docker.
Sample Upstart Script
---------------------
In this example we've already created a container to run Redis with
``--name redis_server``. To create an upstart script for our container,
we create a file named ``/etc/init/redis.conf`` and place the following
into it:
.. code-block:: bash
description "Redis container"
author "Me"
start on filesystem and started docker
stop on runlevel [!2345]
respawn
script
/usr/bin/docker start -a redis_server
end script
Next, we have to configure docker so that it's run with the option ``-r=false``.
Run the following command:
.. code-block:: bash
$ sudo sh -c "echo 'DOCKER_OPTS=\"-r=false\"' > /etc/default/docker"
Sample systemd Script
---------------------
.. code-block:: bash
[Unit]
Description=Redis container
Author=Me
After=docker.service
[Service]
Restart=always
ExecStart=/usr/bin/docker start -a redis_server
ExecStop=/usr/bin/docker stop -t 2 redis_server
[Install]
WantedBy=local.target
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