- name: Extract matching lines hosts: localhost
tasks:
- name: Get lines containing "error" set_fact:
error_lines: "{{ lookup('file', '/tmp/logs.txt') | regex_findall('.*error.*') }}"
- debug:
var: error_lines
Explanation:
This approach processes text files to extract specific lines matching patterns like "error".

- name: Restart service on db1 hosts: web1
tasks:
- name: Restart nginx service:
name: nginx
state: restarted delegate_to: db1
Explanation:
Delegating service management to another host ensures targeted actions on infrastructure components.

- name: Validate CIDR format hosts: localhost
vars:
cidr: "192.168.1.0/24" tasks:
- name: Ensure CIDR is valid fail:
msg: "Invalid CIDR format"
when: not cidr | ipaddr('network')
Explanation:
The ipaddr filter checks if a string is a valid network in CIDR notation, ensuring network data integrity.

- hosts: all
pre_tasks:
- name: Pre-task example
debug:
msg: "This is a pre-task"
tasks:
- name: Main task example debug:
msg: "This is the main task"
post_tasks:
- name: Post-task example debug:
msg: "This is a post-task"
Explanation:
Pre-tasks and post-tasks allow for preparatory and cleanup actions around the main playbook tasks.

ansible-galaxy collection publish my_namespace-my_collection-1.0.0.tar.gz --api-key <your_galaxy_api_key>
Explanation:
The publish command uploads the collection to Ansible Galaxy, making it accessible to the community or other users.