In this chapter, you learned:
Roles organize Ansible code in a way that allows reuse and sharing.
Red Hat Enterprise Linux System Roles are a collection of tested and supported roles intended to help you configure host subsystems across versions of Red Hat Enterprise Linux.
Ansible Galaxy is a public library of Ansible roles written by Ansible users. The ansible-galaxy command can search for, display information about, install, list, remove, or initialize roles.
External roles needed by a playbook may be defined in the roles/requirements.yml file. The ansible-galaxy install -r roles/requirements.yml command uses this file to install the roles on the control node.
Click CREATE to build all of the virtual machines needed for the classroom lab environment. This may take several minutes to complete. Once created the environment can then be stopped and restarted to pause your experience.
If you DELETE your lab, you will remove all of the virtual machines in your classroom and lose all of your progress.