iterate over the hostname stored in var_files - ansible

Question

I have two type of server host names added in the ansible main.yml var file:
main.yml file:
foo_server1: 10.10.1.1
foo_server2: 10.10.1.2
bar_server1: 192.168.1.3
bar_server2: 192.168.1.4
bar_server3: 192.168.1.5
I am having an ansible playbook which essentially runs on foo_server1 and initializes/formats all other servers in the list one at a time - starting with foo_server2 then bar_server1, bar_server2 and so on...
---
- name: Reading variables from var files
hosts: localhost
connection: local
vars_files:
- main.yml
tasks:
- name: Initialize foo server2
command: initialize --host1 {{foo_server1}} to --host2 {{foo_server2}}
- name: Initialize bar server1
command: initialize --host1 {{foo_server1}} to --host2 {{bar_server1}}
- name: Initialize bar server2
command: initialize --host1 {{foo_server1}} to --host2 {{bar_server2}}
- name: Initialize bar server3
command: initialize --host1 {{foo_server1}} to --host2 {{bar_server3}}
I dont want to add multiple lines in the playbook for each server rather wants to loop over the host names from the variable file. I am not sure how i would get this done..i am trying to loop over the hostname.. tried something below but no luck as i am getting undefined variable name..
---
server_list:
foo_server1: 10.10.1.1
foo_server2: 10.10.1.2
bar_server1: 192.168.1.3
bar_server2: 192.168.1.4
bar_server3: 192.168.1.5
Ansible playbook...
---
- hosts: localhost
gather_facts: no
vars_files:
- input.yml
tasks:
- name: Enable replication
local_action: shell initialize --host1 {{item.foo_server1}} --host2 {{item.foo_server2}}
with_items:
- "{{ server_list }}"
Can some one please suggest how can i run the same command on multiple servers. Would appreciate any help offered..

Answer 1

Here is an example for you:
---
- hosts: localhost
gather_facts: no
vars:
servers:
foo_server1: 10.10.1.1
foo_server2: 10.10.1.2
bar_server1: 192.168.1.3
bar_server2: 192.168.1.4
bar_server3: 192.168.1.5
tasks:
- debug:
msg: shell initialize --host1 {{ servers.foo_server1 }} --host2 {{ item.value }}
when: item.key != 'foo_server1'
with_dict: "{{ servers }}"