📚 Ansible Snippets Reference

A curated collection of useful YAML snippets for playbooks, debugging, regex, mapping, and more.

---

🚀 Starters

▶️ Basic Playbook Start

- name: Some text
  hosts: "{{ host | default('all') }}"
  become: true
  gather_facts: no
  ignore_unreachable: true

🧩 Localhost + Dynamic Hosts

- name: Login
  hosts: localhost
  vars:
    ovirt_url: https://cent-engine.qrom.nl/ovirt-engine//api
    ovirt_user: 'admin@ovirt@internalsso'
    ovirt_passwd: 'XxX'
  tasks:
    - name: Get SSO token
      ovirt.ovirt.ovirt_auth:
        url: "{{ ovirt_url }}"
        username: "{{ ovirt_user }}"
        password: "{{ ovirt_passwd }}"

    - name: Add dynamic hosts
      ansible.builtin.add_host:
        name: "{{ item }}"
      loop:
        - ichi.zilux.nl
        - ni.zilux.nl

- name: Do stuff
  hosts: all
  tasks:
    - name: Debug message
      ansible.builtin.debug:
        msg: From second play in playbook

---

🔍 Regex & Search

🔁 Retry Until Match

- name: Retry until 'OnDemand' appears
  ansible.builtin.shell: some command
  register: cmd_res
  retries: 10
  until: cmd_res.stdout_lines | regex_search('OnDemand', multiline=True, ignorecase=True)

🔎 Find Substring

- name: Check for reboot requirement
  debug:
    msg: "{{ sut_verify.stdout }}"
  when: cmd.stdout.find('Requires reboot') != -1

---

🐞 Debugging

🧠 Dump All Variables

- name: Dump all
  hosts: all
  tasks:
    - name: Print debug info
      vars:
        msg: |
          {{ vars | to_nice_json }}
          {{ environment | to_nice_json }}
          {{ group_names | to_nice_json }}
          {{ groups | to_nice_json }}
          {{ hostvars | to_nice_json }}
      debug:
        msg: "{{ msg.split('\n') }}"
      tags: debug_info

    - name: Show hostvars
      debug:
        var: hostvars[inventory_hostname]
      tags: debug_info

📋 Show Facts

- name: Show facts
  hosts: localhost
  gather_facts: true
  tasks:
    - name: Show ansible_facts
      debug: var=ansible_facts

    - name: Show FQDN
      debug:
        msg:
          - "ansible_fqdn: {{ ansible_fqdn }}"
          - "ansible_facts.fqdn: {{ ansible_facts.fqdn }}"
          - "default_ipv4: {{ ansible_default_ipv4.address }}"

---

🧮 Mapping Examples

🗺️ Map Attributes

- name: Map examples
  hosts: all
  vars:
    names:
      - first: Paul
        last: Thompson
        ctc: 100000
        address: { city: LasVegas, country: USA }
      - first: Sarav
        last: AK
        ctc: 200000
        address: { city: Chennai, country: India }

  tasks:
    - debug: msg="{{ names | map(attribute='last') | map('upper') }}"
    - debug: msg="{{ names | map(attribute='ctc') | map('float') }}"
    - debug: msg="{{ names | map(attribute='ctc') | product(['USD']) | map('join',' ') }}"

🔗 Map with Zip

- name: Map with zip
  hosts: all
  vars:
    only: /boot
  tasks:
    - name: Display mounts
      debug:
        msg: "mount = {{ item.0 }} with device = {{ item[1] }}"
      loop: "{{ ansible_mounts | map(attribute='mount') | zip(ansible_mounts | map(attribute='device')) }}"
      when: item.0 == only

---

🔁 Subelement Examples

- name: Loop with subelements
  hosts: localhost
  vars:
    users:
      - name: jan
        mysqlhosts:
          - host: hosta
            port: 8080
      - name: harry
        mysqlhosts:
          - host: hostb
            port: 8090
          - host: hostc
            port: 8190
  tasks:
    - name: With subelements
      debug:
        msg: "{{ item.0.name }} - {{ item.1.host }} - {{ item.1.port }}"
      loop: "{{ users | subelements('mysqlhosts') }}"

---

🧪 Selectattr Examples

- name: Selectattr examples
  hosts: localhost
  vars:
    bands:
      - name: The Beatles
        members: [Lennon, McCartney, Harrison, Starr]
        formed: 1960
        decade: 60s
      - name: Run DMC
        members: [Simmons, McDaniels, Mizell]
        formed: 1983
        decade: 80s
  tasks:
    - name: Bands formed in 1983
      debug:
        msg: "{{ bands | selectattr('formed', 'match', '1983') | map(attribute='name') }}"

---

🧪 OS Update & Reboot

🔄 Update OS

- hosts: all
  become: yes
  tasks:
    - name: Upgrade packages
      yum:
        name: '*'
        state: latest
        update_cache: yes
        exclude:
          - docker-ce
          - cassandra

🔁 Reboot Server

- name: Reboot server
  ansible.builtin.reboot:
    msg: "Server reboot via Ansible"
    connect_timeout: 5
    reboot_timeout: 600
    pre_reboot_delay: 60
    post_reboot_delay: 1200
  when: reboot_select == "yes"

---

📦 Variable Definitions

- name: Define vars
  hosts: localhost
  vars:
    mynlijst: ['een', 'twee']
    mynlistofhash:
      - { naam: harry, adres: hier }
      - { naam: piet, adres: daar }
    users:
      alice:
        name: Alice Appleworth
        telephone: 123-456-7890
  tasks:
    - debug: var=users.alice.telephone
    - name: Loop over dictionary
      debug:
        msg: "{{ item.key }} is {{ item.value.name }} {{ item.value.telephone }}"
      loop: "{{ users | dict2items }}"

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