---
# This playbook does a rolling update of the code for all webservers serially (one at a time).
# Change the value of serial: to adjust the number of server to be updated.
# This playbook also takes the webapp_version variable to specify which git version
# of the test webapp to deploy.

- hosts: webservers
  user: root
  serial: 1
  tasks:
  
  - name: disable nagios alerts for this host webserver service
    nagios: action=disable_alerts host=$ansible_hostname services=webserver
    delegate_to: $item
    with_items: ${groups.monitoring}

  - name: disable the server in haproxy
    shell: echo "disable server myapplb/${ansible_hostname}" | socat stdio /var/lib/haproxy/stats
    delegate_to: $item
    with_items: ${groups.lbservers}

  - name: Remove the code from server
    command: rm -rf /var/www/html/*

  - name: Copy the code from repository
    git: repo=${repository} version=${webapp_version} dest=/var/www/html/

  - name: Enable the server in haproxy
    shell: echo "enable server myapplb/${ansible_hostname}" | socat stdio /var/lib/haproxy/stats
    delegate_to: $item
    with_items: ${groups.lbservers}

  - name: re-enable nagios alerts
    nagios: action=enable_alerts host=$ansible_hostname services=webserver
    delegate_to: $item
    with_items: ${groups.monitoring}