A (very) simple Vagrant file to help set up an experimental docker swam environment with 2 masters and two slaves. Options (no of masters/slaves, memory allocated to the machines are easily configurable).
git clone [email protected]:pkaramol/vagrant-swarm.git
cd vagrant-swarm
vagrant upThis will init a private network consisting of 2 master swam nodes on IPs 192.168.1.11, 192.168.1.12 and two slave nodes on IPs 192.168.1.21, 192.168.1.22.
Master / slave distinction is only semantic (hostnames) and resource (RAM) based for the time being. Swarm initiation and boostrapping needs to be taken care of by you; here is a way that you could do this:
$ vagrant ssh master1
ubuntu@master1:~$ docker swarm init --advertise-addr 192.168.1.11
Swarm initialized: current node (i2l6veyx68wppvp0de1lzpwl0) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join --token <token_value> 192.168.1.11:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
The above process will make master1 the leader of the swarm.
Then, login to all other three nodes typing the above command, e.g.:
vagrant ssh master2
ubuntu@master2:~$ docker swarm join --token <token_value> 192.168.1.11:2377
This node joined a swarm as a worker.You can (if you like) promote node with hostname master2 so that it actually becomes a master by logging in to the leader node (master1) and typing:
ubuntu@master1:~$ docker node promote master2Has been tested with vagrant 2.0.0, virtualbox 5.0.40_Ubuntu r115130 on Ubuntu 16.04.3 LTS