Hello,
I have a group of hosts named "db" with number of nodes that may vary. Each
node has a fact ("seqno") which is an integer number.
I need to compare this fact among all hosts and choose maximum value, then
run some actions on one (and only one) host that has this maximum value. In
case of multiple nodes having the same value, first node should be chosen.
I tried this approach:
- name: find max seqno value
set_fact: seqno_max={{ [hostvars[groups['db'][0]]['seqno'], hostvars[
groups['db'][1]]['seqno']] | max }}
- name: find single hostname to use as a node with max seqno
set_fact: seqno_max_host={{ hostvars[item]['inventory_hostname'] }}
with_items: groups['db'][::-1] # reverse list. if two nodes have the same
seqno, use first node as starting point.
when: hostvars[item]['seqno'] == seqno_max
- name: Some actions based on a result of previous tasks
action: # Run some actions
when: seqno_max_host == inventory_hostname
But for some reason "max" operator always return the second value. Also
this approach is valid only if you have arbitrary specified number of hosts
- It would be best to have a solution that works for any number of hosts.
Is there a better approach to that?
Karol
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