Continuous Delivery with Docker and Jenkins

Defining a playbook

A playbook is composed of one or many plays. Each play contains a host group name, tasks to perform, and configuration details (for example, remote username or access rights). An example playbook might look like this:

---- hosts: web1  become: yes  become_method: sudo  tasks:  - name: ensure apache is at the latest version    apt: name=apache2 state=latest  - name: ensure apache is running    service: name=apache2 state=started enabled=yes

This configuration contains one play which:

• Is executed only on the host web1
• Gains root access using the sudo command
• Executes two tasks:
  • Installing the latest version of apache2: The Ansible module apt (called with two parameters name=apache2 and state=latest) checks whether the apache2 package ...