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Docker Salt-Master

A Docker image which allows you to run a containerised Salt-Master server. Based on of
thisissoon/Docker-Salt-Master

Running the Container

For a test you can easily run the container like so:

docker run --rm -it asmaps/salt-master

A more advanced configuration that mounts the volumes to a local directory and exposes the ports to the world is this:

docker run -d -p 4505:4505 -p 4506:4506 --restart=always -v /opt/salt/pki:/etc/salt/pki -v /opt/salt/cache:/var/salt/cache
-v /opt/salt/log:/var/log/salt -v /srv/salt:/srv/salt -v /srv/salt/master.d:/etc/salt/master.d --name salt-master
asmaps/salt-master

Environment Variables

The following environment variables can be set:

  • LOG_LEVEL: The level to log at, defaults to error

Volumes

There are several volumes which can be mounted to Docker data container as
described here: https://docs.docker.com/userguide/dockervolumes/. The following
volumes can be mounted:

  • /etc/salt/pki - This holds the Salt Minion authentication keys
  • /var/cache/salt - Job and Minion data cache
  • /var/logs/salt - Salts log directory
  • /etc/salt/master.d - Master configuration include directory
  • /srv/salt - Holds your states, pillars etc

Data Container

To create a data container you are going to want the thinnest possible docker
image, simply run this docker command, which will download the simplest possible
docker image:

docker run -v /etc/salt/pki -v /var/salt/cache -v /var/logs/salt -v /etc/salt/master.d -v /srv/salt --name salt-master-data busybox true

This will create a stopped container with the name of salt-master-data and
will hold our persistant salt master data. Now we just need to run our master
container with the --volumes-from command:

docker run --rm -it --name salt-master --volume-from salt-master-data asmaps/salt-master

Sharing Local Folders

To share folders on your local system so you can have your own master
configuration, states, pillars etc just alter the salt-master-data
command:

docker run -v /etc/salt/pki -v /var/salt/cache -v /var/logs/salt -v /path/to/local:/etc/salt/master.d -v /path/to/local:/srv/salt --name salt-master-data busybox true

Now /path/to/local can hold your states and master configuration.

Ports

The following ports are exposed:

  • 4505
  • 4506

These ports allow minions to communicate with the Salt Master.

Running Salt Commands

To run commands in your master container use the docker exec command. (This needs at least docker 1.3)

For example:

docker exec -t salt-master "salt '*' test.ping"

Accepting new minions

To accept a new minion run the following command (replace <minion_id> with the actual id):

docker exec -t salt-master salt-key -a <minion_id>
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asmaps
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