Ansible

Krishna Neupane

Jan 2, 2023

Getting started

Hosts

Copy 
    $ sudo mkdir /etc/ansible
    $ sudo vim /etc/ansible/hosts

    [example]
    192.0.2.101
    192.0.2.102

Running a playbook

Copy 
    $ ansible-playbook playbook.yml

Playbook files

Tasks

Copy 
    - hosts: all
      user: root
      sudo: no
      vars:
        aaa: bbb
      tasks:
        - ...
      handlers:
        - ...

Includes

Copy 
    tasks:
      - include: db.yml
    handlers:
      - include: db.yml user=timmy

Handlers

Copy 
    handlers:
      - name: start apache2
        action: service name=apache2 state=started

    tasks:
      - name: install apache
        action: apt pkg=apache2 state=latest
        notify:
          - start apache2

Vars

Copy 
    - host: lol
      vars_files:
        - vars.yml
      vars:
        project_root: /etc/xyz
      tasks:
        - name: Create the SSH directory.
          file: state=directory path=${project_root}/home/.ssh/
          only_if: "$vm == 0"

Roles

Copy 
    - host: xxx
      roles:
        - db
        - { role:ruby, sudo_user:$user }
        - web

    # Uses:
    # roles/db/tasks/*.yml
    # roles/db/handlers/*.yml

Task: Failures

Copy 
    - name: my task
      command: ...
      register: result
      failed_when: "'FAILED' in result.stderr"

      ignore_errors: yes

      changed_when: "result.rc != 2"

Env vars

Copy 
    vars:
      local_home: "{{ lookup('env','HOME') }}"

Structure

Copy 
    roles/
      common/
        tasks/
        handlers/
        files/              # 'copy' will refer to this
        templates/          # 'template' will refer to this
        meta/               # Role dependencies here
        vars/
        defaults/
          main.yml

For More please Visit Ansible Documentation

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