iterate over the hostname stored in var_files

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..

You cannot do it because the data structure, which you defined, does not contain information of what goes into `--host1` argument and what goes into `--host2`. Besides, your vocabulary is broken -- you call a dictionary "a list". — techraf, Apr 01 '17 at 02:09

score 0 · Accepted Answer · answered Apr 01 '17 at 07:56

0

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 }}"

answered Apr 01 '17 at 07:56

Konstantin Suvorov

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Thanks @Konstantin Suvorov. i see what i was doing wrong.. only thing is its looping over foo_server1 as well. i basically do not want foo_server1 key value showing up under --host2 . i want all the servers to format except foo_server1 host server. How do i avoid that? – Deepak Prasad Apr 03 '17 at 03:19
Condition `item.key != 'foo_server1'` is exactly for this reason, this way loop will always skip iteration with `foo_server1` – Konstantin Suvorov Apr 03 '17 at 05:48

iterate over the hostname stored in var_files

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