swarm cluster on virtualbox

README.md

Required software

Vagrant

Virtualbox

Download the files on this gist

Run the master

vagrant up master

At the end this will return the tokens to add workers or managers to the swarm cluster

Run the workers

vagrant up worker1
vagrant up worker2

ssh connection to the nodes

To get connected to the nodes, should use vagrant ssh command like:

vagrant ssh [worker1|master]

playbook.yml

---
- hosts: all
  become: yes
  become_method: sudo
  gather_facts: False


  pre_tasks:
    - setup:
      gather_subset: 'network'

  tasks:
    - name: is docker already installed
      shell: >
        docker info
      register: docker_info
      changed_when: false
      ignore_errors: true
      failed_when: false

    - name: installs docker and setup repositories
      shell: >
        curl -fsSL https://get.docker.com/ | sh
      when:
        - docker_info.stdout == ""
      args:
        warn: false

    - name: enable docker
      systemd:
        name: docker
        enabled: yes
        state: reloaded
      when:
        - docker_info.stdout == ""

    - name: adding user to docker
      user:
        name: vagrant
        groups: docker
        append: yes

    - name: determine swarm status
      shell: >
        docker info | egrep '^Swarm: '
      register: swarm_status
      when:
        - ansible_fqdn == 'manager.test.lan'
      changed_when: false

    - name: enabling swarm
      shell: >
        docker swarm init --advertise-addr {{ ansible_eth1['ipv4']['address'] }}
      when:
        - ansible_fqdn == "manager.test.lan"
        - '"inactive" in swarm_status.stdout'

    - name: looking for the swarm worker key
      shell: >
        docker swarm join-token worker
      register: swarm_worker_key
      when: ansible_fqdn == 'manager.test.lan'
      changed_when: false

    - name: looking for the swarm manager key
      shell: >
        docker swarm join-token manager
      register: swarm_manager_key
      when: ansible_fqdn == 'manager.test.lan'
      changed_when: false

    - name: Here is the swarm worker key
      debug: msg="{{ swarm_worker_key.stdout_lines }}"
      when: ansible_fqdn == 'manager.test.lan'

    - name: Here is the swarm manager key
      debug: msg="{{ swarm_manager_key.stdout_lines }}"
      when: ansible_fqdn == 'manager.test.lan'

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure('2') do |config|
  config.vm.box = 'centos/7'
  config.vm.define 'manager' do |manager|
    manager.vm.network 'private_network', ip: '10.10.10.10'
    manager.vm.host_name = 'manager.test.lan'
  end

  %w[worker1 worker2 worker3].each_with_index do |worker, index|
    config.vm.define worker, autostart: false do |wkr|
      wkr.vm.network 'private_network', ip: "10.10.10.#{index + 2}"
      wkr.vm.host_name = "worker#{index + 1}.test.lan"
    end
  end

  config.vm.provider :virtualbox do |v|
    v.customize ['modifyvm', :id, '--memory', 1024]
  end

  config.vm.provision :ansible_local do |ansible|
    ansible.playbook = 'playbook.yml'
  end
end