Ansible

Configuration#

Inventory File#

Create an inventory file to define the hosts and groups of hosts to manage.

# filepath: /etc/ansible/hosts
[webservers]
web1.example.com
web2.example.com

[dbservers]
db1.example.com
db2.example.comini

Ansible Configuration File#

Create an Ansible configuration file to set global options.

# filepath: /etc/ansible/ansible.cfg
[defaults]
inventory = /etc/ansible/hosts
remote_user = ansible
host_key_checking = Falseini

Basic Commands#

Ping All Hosts#

ansible all -m pingbash

Run a Command on All Hosts#

ansible all -a "/bin/echo hello"bash

Run a Command on a Specific Group#

ansible webservers -a "/bin/echo hello"bash

Playbooks#

Basic Playbook#

Create a playbook to automate tasks.

# filepath: /etc/ansible/playbooks/example.yml
- hosts: webservers
  tasks:
    - name: Ensure Apache is installed
      apt:
        name: apache2
        state: present
      become: yes

    - name: Ensure Apache is running
      service:
        name: apache2
        state: started
        enabled: yes
      become: yesyaml

Run a Playbook#

ansible-playbook /etc/ansible/playbooks/example.ymlbash

Useful Modules#

Package Management#

- name: Install a package
  apt:
    name: package_name
    state: present
  become: yesyaml

Service Management#

- name: Start a service
  service:
    name: service_name
    state: started
    enabled: yes
  become: yesyaml

File Management#

- name: Create a directory
  file:
    path: /path/to/directory
    state: directory
    mode: "0755"
  become: yesyaml