Ansible IP address variable remote hosts

Question

I have the following problem:

I'm writing a playbook for configuring NFS server and NFS client.

in the same playbook, I include 2 other tasks :

CentOS_7_NFS_Server.yml and CentOS_7_NFS_Client.yml

for I can execute one of the tasks I need to compare the IP address of

the remote hosts

Example :

- include: CentOS_7_NFS_Server.yml
  when: ansible_all_ipv4_addresses == NFS_Server

- include: CentOS_7_NFS_Client.yml
  when:  ansible_all_ipv4_addresses == NFS_Client 

in the var :

NFS_Server: x.x.x.x
NFS_Client : y.y.y.y

I got this error

FAILED! => {"msg": "The conditional check 'ansible_all_ipv4.address 
== NFS_Client' failed. The error was: error while evaluating 
conditional (ansible_all_ipv4.address == NFS_Client): 
'ansible_all_ipv4' is undefined\n\nThe error appears to have been 
in

Answer 1

Very probably the collecting of the facts is disabled. when you see the error:

ansible_all_ipv4_addresses: VARIABLE IS NOT DEFINED!

Enable it

- hosts: nfs_server_and_client
  gather_facts: yes

There is one more problem. ansible_all_ipv4_addresses is list of all addresses. For example.

  ansible_all_ipv4_addresses:
  - 192.168.122.1
  - 10.1.0.11
  - 192.168.1.10

You'll have to pick one, or more and assign it to NFS_Server and NFS_Client . Then the condition shall test if NFS_Server and NFS_Client , respectively, is in the list ansible_all_ipv4_addresses .

- include: CentOS_7_NFS_Server.yml
  when: NFS_Server in ansible_all_ipv4_addresses

- include: CentOS_7_NFS_Client.yml
  when: NFS_Client in ansible_all_ipv4_addresses