Ansible Lab

delegation-test.yml

---
- name: play - one
  hosts: vm01.example.com
  tasks:
    - name: write content
      copy:
        content: "{{ ansible_nodename }}"
        dest: /tmp/managed_host.txt

    - name: get content
      command: cat /tmp/managed_host.txt
      register: results

    - debug:
        msg: "content of managed_host.txt on {{ ansible_host }} is {{ results.stdout }}"

    - name: write content with delegate_to
      copy:
        content: "{{ ansible_nodename }}"
        dest: /tmp/managed_host.txt
      delegate_to: vm02.example.com

    - name: get content with delegate_to
      command: cat /tmp/managed_host.txt
      register: results
      delegate_to: vm02.example.com

    - debug:
        msg: "content of managed_host.txt on {{ ansible_host }} is {{ results.stdout }}"
      delegate_to: vm02.example.com
      

delegation1.output

PLAY [play - one] ****************************************************************************

TASK [Gathering Facts] ***********************************************************************
ok: [vm01.example.com]

TASK [task - one] ****************************************************************************
ok: [vm01.example.com] => {
    "msg": "Facts variable is from vm01.example.com and myvar is variable one"
}

PLAY RECAP ***********************************************************************************
vm01.example.com        : ok=2    changed=0    unreachable=0    failed=0

delegation1.yml

---
- name: play - one
  hosts: vm01.example.com
  vars:
    - myvar: variable one
  tasks:
    - name: task - one
      debug:
        msg: Facts variable is from {{ ansible_nodename }} and myvar is {{ myvar }}

delegation2.output

PLAY [play - one] ****************************************************************************

TASK [Gathering Facts] ***********************************************************************
ok: [vm01.example.com]

TASK [task - one] ****************************************************************************
ok: [vm01.example.com] => {
    "msg": "Facts variable is from vm01.example.com and myvar is variable one"
}

PLAY [play - two] ****************************************************************************

TASK [Gathering Facts] ***********************************************************************
ok: [vm02.example.com]

TASK [task - one] ****************************************************************************
ok: [vm02.example.com] => {
    "msg": "Facts variable is from vm02.example.com and myvar is variable two"
}

PLAY RECAP ***********************************************************************************
vm01.example.com        : ok=2    changed=0    unreachable=0    failed=0
vm02.example.com        : ok=2    changed=0    unreachable=0    failed=0

delegation2.yml

---
- name: play - one
  hosts: vm01.example.com
  vars:
    - myvar: variable one
  tasks:
    - name: task - one
      debug:
        msg: Facts variable is from {{ ansible_nodename }} and myvar is {{ myvar }}

- name: play - two
  hosts: vm02.example.com
  vars:
    - myvar: variable two
  tasks:
    - name: task - one
      debug:
        msg: Facts variable is from {{ ansible_nodename }} and myvar is {{ myvar }}

delegation3.output

PLAY [play - one] **********************************************************************************

TASK [Gathering Facts] *****************************************************************************
ok: [vm01.example.com]

TASK [task - one] **********************************************************************************
ok: [vm01.example.com] => {
    "msg": "Facts variable is from vm01.example.com and myvar is variable one"
}

TASK [task - two] **********************************************************************************
ok: [vm01.example.com -> vm02.example.com] => {
    "msg": "Facts variable is from vm01.example.com and myvar is variable one"
}

PLAY RECAP *****************************************************************************************
vm01.example.com        : ok=3    changed=0    unreachable=0    failed=0

delegation3.yml

---
- name: play - one
  hosts: vm01.example.com
  vars:
    - myvar: variable one
  tasks:
    - name: task - one
      debug:
        msg: Facts variable is from {{ ansible_nodename }} and myvar is {{ myvar }}

    - name: task - two
      debug:
        msg: Facts variable is from {{ ansible_nodename }} and myvar is {{ myvar }}
      delegate_to: vm02.example.com

parallel-test.yml

---
- name: play one
  hosts: srvgroup01
  serial: 2
  tasks:
    - name: update installed packages
      yum:
        name: "*"
        state: latest
      
- name: play two
  hosts: srvgroup02
  serial: 5
  tasks:
    - name: update installed packages
      yum:
        name: "*"
        state: latest

serial-sleep.yml

---
- name: serial test
  hosts: webservers
  serial: 1
  tasks:
    - name: sleep 10 seconds
      command: sleep 10