ansible-playbook -i dynamic_inventory.py site.yml --limit web1,db1
Explanation:
Limiting playbook execution to specific hosts in a dynamic inventory provides finer control over deployments.

# playbook.yml
- name: Tagged tasks example hosts: all
tasks:
- name: Install nginx yum:
name: nginx
state: present tags: install
Execution:
ansible-playbook -i inventory.yml playbook.yml --tags "install"
Explanation:
Tags allow selective execution of tasks in a playbook, making debugging and incremental updates more efficient.

- name: Check http_port hosts: all
tasks:
- name: Validate http_port debug:
msg: "http_port is defined" when: http_port is defined
Explanation:
Checking variable existence with when avoids failures due to undefined variables, ensuring smoother playbook runs.

mkdir -p host_vars
echo "ansible_user: admin" > host_vars/web1.yml
echo "ansible_user: root" > host_vars/db1.yml
Explanation:
Organizing host_vars ensures clarity when managing unique configurations for multiple hosts.

# inventory.yml
staging:
hosts:
web1:
web2:
vars:
http_port: 8080
production:
hosts:
web3:
Explanation:
Group-level variables apply uniformly to all hosts within a group, ensuring consistent configurations across environments.