Ansible – Use values in a loop from hosts file on another host

 

There is a "hosts" file in which there is a group of "db". These are database instances that play a different role. The goal is to add the role type to the "hosts" file, so that later we can use this value in a loop that will be executed on a completely different host, for example "management"

Source "hosts" file:

[db]
db1 ansible_host=192.168.1.101
db2 ansible_host=192.168.1.102
db3 ansible_host=192.168.1.103

 

Add the "role" key with the necessary value for each host in the "db" group:

[db]
db1 role=development ansible_host=192.168.1.101
db2 role=staging ansible_host=192.168.1.102
db3 role=production ansible_host=192.168.1.103

 

Playbook example:

---

- name: management
  gather_facts: No
  hosts: management
 
  tasks:
    - name: debug
      debug:
        msg: "Instance {{ item.1 }} with IP {{ hostvars[ item.1 ].ansible_host }} is {{ hostvars[ item.1 ].role}}"
      with_indexed_items: "{{ groups['db'] }}"

 

Output:

ok: [management] => (item=[0, u'db1']) => {
    "msg": "Instance db1 with IP 192.168.1.101 is development"
}
ok: [management] => (item=[1, u'db2']) => {
    "msg": "Instance db2 with IP 192.168.1.102 is staging"
}
ok: [management] => (item=[2, u'db3']) => {
    "msg": "Instance db3 with IP 192.168.1.103 is production"
}
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