Ansible Playbook Structure Best Practices

Ansible Playbook Structure

Ansible Playbook structure is defined in official documentation but the recommended way to group hosts and apply roles is something that each user would have to decide for itself.

Define and apply a company-wide consistent structure for all your Ansible Playbooks that allows for easy understanding and maximum reutilization.

  • Avoid using individual hostnames to select hosts. In the cloud, all hosts should be treated as cattle, not as pets.
  • Create groups of hosts by:
    • Operating System and major release
    • Application and application release
    • Environment
  • Give safe defaults to all roles and use the group_vars to redefine values
  • Use a single playbook definition file for each environment
group_vars\allContains default values for variables that will be applied to all hosts, independently from its membership to other groups.
group_vars\tag_app_wpContains values to variables from hosts in group tag_app_wp (AWS tag app=wp).
group_vars\tag_environment_preContains values to variables from hosts in group tag_environment_pre (AWS tag environment=pre).
group_vars\tag_environment_proContains values to variables from hosts in group tag_environment_pre (AWS tag environment=pro).
inventorySince we are using Ansible Dynamic Inventory, it has the ec2.ini and files.
roles\Root roles directory
roles\linux\add_packagesRole to install WordPress
roles\linux\host_nameRole to set the hostname of the instance
roles\linux\hosts_fileRole to modify local hosts file for resolver
roles\linux\pam_limitsRole to set various pam limits for kernel configuration
roles\linux\wordpressRole to install WordPress
ansible.cfgLocal ansible configuration
ditwl_pro.shSets environment variables for PRO environment
ditwl_pro.ymlPlaybook for PRO environment

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