Create a space-separated list of play_hosts in Ansible
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Sometimes I need a list of hosts as a string when working with Ansible. Pacemaker clustering is one example. Here’s a snippet of Ansible that does this..
- name: Setup list of cluster hosts
set_fact:
host_list: "{{ host_list }}{{ (play_hosts.index(item) == 0) | ternary('',' ') }}{{ item }}"
loop: "{{ play_hosts }}"
run_once: yes |
This play will produce the following output;
ok: [cnode1] => {
"host_list": "cnode1 cnode2 cnode4 cnode3"
} |
If you need a different separator just change the second parameter in the ternary function. The below example produces a comma-separated list of play_hosts…
- name: Setup list of cluster hosts
set_fact:
host_list: "{{ host_list }}{{ (play_hosts.index(item) == 0) | ternary('',',') }}{{ item }}"
loop: "{{ play_hosts }}"
run_once: yes |
ok: [cnode1] => {
"host_list": "cnode1,cnode2,cnode4,cnode3"
} |