code/roles at master · ajay-cs/code · GitHub

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Understanding roles.

/etc/ansible/roles
# ansible-galaxy  init  admin
- admin was created successfully


# ls -l admin/
total 4
drwxr-xr-x. 2 root root   22 Dec 14 10:27 defaults
drwxr-xr-x. 2 root root    6 Dec 14 10:27 files
drwxr-xr-x. 2 root root   22 Dec 14 10:27 handlers
drwxr-xr-x. 2 root root   22 Dec 14 10:27 meta
-rw-r--r--. 1 root root 1328 Dec 14 10:27 README.md
drwxr-xr-x. 2 root root   22 Dec 14 10:27 tasks
drwxr-xr-x. 2 root root    6 Dec 14 10:27 templates
drwxr-xr-x. 2 root root   39 Dec 14 10:27 tests
drwxr-xr-x. 2 root root   22 Dec 14 10:27 vars


#vi /etc/ansible/playbook.yml
---
 - hosts: all
   roles:
   - admin

Here it will run the role `admin` on all hosts. It will run below
# cat admin/tasks/main.yml
---
# tasks file for admin

########################################
]# cat roles/admin/tasks/main.yml
---
# tasks file for admin
-  name: Install ntp modules required by our app.
   yum: name={{ item }}  state=present
   with_items: ntp


# cat test.yaml
---
 - hosts: all
   become: yes
   roles:
   - admin

# ansible-playbook test.yaml