Testing ansible playbooks against multiple targets using vagrant

I recently updated my Install docker and docker-compose using ansible post and wanted to test it against multiple target OSes and OS versions. Here's a way I found to do it easily using Vagrant.

Here's the Vagrantfile:

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

targets = [
  "debian/bookworm64",
  "debian/bullseye64",
  "debian/buster64",
  "ubuntu/jammy64",
  "ubuntu/bionic64",
  "ubuntu/focal64"
]

Vagrant.configure("2") do |config|
  targets.each_with_index do |target, index|
    config.vm.define "machine#{index}" do |machine|
      machine.vm.hostname = "machine#{index}"
      machine.vm.box = target
      machine.vm.synced_folder ".", "/vagrant", disabled: true

      if index == targets.count - 1
        machine.vm.provision "ansible" do |ansible|
          ansible.playbook = "playbook.yml"
          ansible.limit = "all"
          ansible.compatibility_mode = "2.0"
          # ansible.verbose = "v"
        end
      end
    end
  end
end

The targets variable defines what Vagrant boxes to target. The possible list of boxes can be found here: https://app.vagrantup.com/boxes/search

In the Vagrant.configure section, I've defined a machine with an auto-generated machine ID for each target.

The machine.vm.synced_folder line disables the default vagrant share to keep things fast.

Then, I've run the ansible provisioning once at the end instead of for each box separately (from: https://developer.hashicorp.com/vagrant/docs/provisioning/ansible#tips-and-tricks).

The test can be run using:

$ vagrant up

If the boxes are already up, to re-run provisioning, run:

$ vagrant provision

This code can also be found on GitHub: https://github.com/srijan/ansible-install-docker