AppWebUpdate.yml

---
- name: Upgrade foo-app in place
  hosts: foo-app
  serial: 2
 	   
# Disable foo-app from Load balancer (delegate to foo-lb)

tasks:
- name: disable member in balancer
  haproxy:
    backend: foo-app
    host: "{{ inventory_hostname }}"
    state: disabled
  delegate_to: foo-lb

# Update foo-app from Git and reload Nginx after it (notify)

- name: pull stable foo-app
  git:
    repo: "{{ foo-app.repo }}"
    dest: /srv/foo-app/
    version: "{{ foo-version }}"
  notify:
    - reload nginx

???
- meta: flush_handlers

# Check Nginx for listening 80 port

- name: ensure healthy service
  wait_for:
    port: 80

# Enable foo-app to Load balancer (delegate to foo-lb)

- name: enable member in balancer
  haproxy:
    backend: foo-app
    host: "{{ inventory_hostname }}"
    state: enabled
  delegate_to: foo-lb

???
handlers:
  - name: reload nginx
    service:
      name: nginx
      state: restarted