Automation with Ansible (7) - Accessing inventory host variable from playbook

Accessing host variable from playbook overview

Before writing full script, I need to learn how to access variables from host file. I tried to use range varible from host variable, but this doesn't work.

Host file

filename is "dockerhosts"

[dockermasters]
dockermaster01 ipaddr=10.200.0.152
dockermaster02 ipaddr=10.200.0.153

[dockerworkers]
dockerworkders01 ipaddr=10.200.0.154
dockerworkders02 ipaddr=10.200.0.155
dockerworkders03 ipaddr=10.200.0.156

YAML playbook file

filename is "test.yaml"

---
- name: Access Inventory Variable
  hosts: dockermasters
  connection: local
  # vars:
  #   - ip: "{{ hostvars['hostname'][client_ip] }}"
  #   - hostname: "{{ hostvars['hostname'][client_hostname] }}"
  tasks:
    - name: createVM from Template
      debug:
        var: hostvars[inventory_hostname]['ipaddr']
    - name: show hostname
      debug:
        msg: "hostname is {{ inventory_hostname }}"

Result

[ansible@ansible01 test]$ ansible-playbook -i dockerhosts test.yaml

PLAY [Create VM from Docker Master] ********************************************

TASK [Gathering Facts] *********************************************************
ok: [dockermaster01]
ok: [dockermaster02]

TASK [createVM from Template] **************************************************
ok: [dockermaster01] => {
    "hostvars[inventory_hostname]['ipaddr']": "10.200.0.152"
}
ok: [dockermaster02] => {
    "hostvars[inventory_hostname]['ipaddr']": "10.200.0.153"
}

TASK [show hostname] ***********************************************************
ok: [dockermaster01] => {
    "msg": "hostname is dockermaster01"
}
ok: [dockermaster02] => {
    "msg": "hostname is dockermaster02"
}

PLAY RECAP *********************************************************************
dockermaster01             : ok=3    changed=0    unreachable=0    failed=0
dockermaster02             : ok=3    changed=0    unreachable=0    failed=0

[ansible@ansible01 test]$

Summary

Now we are ready to generate full VMs using host variable.