template.json

{
  "variables": {
    "instance_name": "packer-jenkins",
    "ansible_roles_path": "galaxy_roles",
    "flavor": "m1.small",
    "image_name": "Dinivas Jenkins Master {{isotime \"2006-01-02\"}}",
    "image_tags": "dinivas,ci-cd,jenkins,jenkins-master",
    "image_visibility": "public"
  },
  "builders": [
    {
      "type": "openstack",
      "source_image": "{{user `source_image_id`}}",
      "flavor": "{{user `flavor`}}",
      "image_visibility": "{{user `image_visibility` }}",
      "ssh_username": "{{user `ssh_user` }}",
      "image_name": "{{user `image_name` }}",
      "image_tags": "{{user `image_tags` }}",
      "instance_name": "{{user `instance_name`}}",
      "networks": "{{user `network_id`}}",
      "floating_ip_network": "{{user `floating_ip_network`}}"
    },
    {
      "type": "digitalocean",
      "image": "{{user `source_image_name`}}",
      "region": "{{user `region` }}",
      "size": "{{user `flavor` }}",
      "ssh_username": "{{user `ssh_user` }}",
      "snapshot_name": "{{user `image_name` }}",
      "tags": "{{user `image_tags` }}",
      "droplet_name": "{{user `instance_name`}}"
    }
  ],
  "provisioners": [
    {
      "type": "ansible",
      "ansible_env_vars": ["ANSIBLE_ROLES_PATH={{user `ansible_roles_path` }}"],
      "user": "{{user `ssh_user` }}",
      "playbook_file": "./playbook.yml",
      "galaxy_file": "requirements.yml",
      "roles_path": "{{user `ansible_roles_path` }}",
      "extra_arguments": [],
      "host_alias": "{{user `instance_name`}}"
    }
  ],
  "post-processors": [
    {
      "type": "manifest",
      "output": "manifest.json",
      "strip_path": true
    }
  ]
}