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How To Run Salt-Master In Docker Container


In this post we will use a Ubuntu based docker image in which I have already installed the salt-master and uploaded it into docker hub. If you are looking for installing the salt-master in docker container from scratch then check out this guide.

Here I am assuming that you are having Ubuntu host up and running with public IP configured on it.
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Pull the docker image

$ docker pull yogeshprasadkurmi/ubuntu-salt-master
This is a Ubuntu 14.04.5 based image with salt-master installed on it. Salt-master will be up and running if you create the container using this images.

Create Salt-master Server

$ docker run -ti --name salt-master-server  --net=none --privileged=true yogeshprasadkurmi/ubuntu-salt-master bash
This will create a container with salt-master installed on it.

Assigning an IP for a container

Here I am assuming that host machine is having interface "eth0" with public IP configured. Name of the container is salt-master-server. The below steps needs to be performed on the docker host.

  • Create a virtual interface

    $ ip link add name veth0 link eth0 type macvlan mode bridge
     New virtual interface "veth0" will be created 

  • Get the process id for the salt master container

    $ docker inspect -f '{{.State.Pid}}' salt-master-server
  • $ mkdir -p /var/run/netns

    $ ln -s /proc/<processid>/ns/net /var/run/netns/<processid>

  • Assign the virtual interface to salt-master

    $ ip link set veth0 netns <processid> name eth0

  • Get the public Ip to virtual interface

    $ docker exec -it salt-master-server dhclient -v eth0

Note: If you are facing any issue on assigning the static public IP to the container then check out this guide

  • Restart the salt-master service (This needs to be run inside the container)

    $ service salt-master restart
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