Ansible : parameterize roles by adding variables

http://docs.ansible.com/ansible/playbooks_roles.html

- hosts: webservers
  roles:
    - common
    - { role: foo_app_instance, dir: '/opt/a',  app_port: 5000 }
    - { role: foo_app_instance, dir: '/opt/b',  app_port: 5001 }

Ansible : reboot a server and wait for it to come back

https://support.ansible.com/hc/en-us/articles/201958037-Reboot-a-server-and-wait-for-it-to-come-back

- name: restart machine
  shell: sleep 2 && shutdown -r now "Ansible updates triggered"
  async: 1
  poll: 0
  ignore_errors: true

- name: waiting for server to come back
  local_action: wait_for host={{ inventory_hostname }} port=22 delay=30 timeout=300