I have a pair of servers (server1.<environment>.domain,
server2.<environment>.domain) in two environments (staging and production).
Server1 is primary, server2 is secondary.
When I originally built the playbook, I had aliases in the inventory file
[staging-cluster]
primary server1.staging.domain
secondary server2.staging.domain
And I'd target the IP of the other host with {{
hostvars['primary']['ansible_eth0']['ipv4']['address'] }} to get the of the
"other" host. This worked fine, until I needed the playbook to target
another set of hosts in production:
[production-cluster]
primary server1.prod.domain
secondary server2.prod.domain
The problem with the above, aliases are global and you can't have more than
one in an inventory. So...this breaks the above lookup {{
hostvars['secondary']['ansible_eth0']['ipv4']['address'] }}
As much as I disliked the idea, I then thought to leverage
hostvars/serverX.environment.domain with a var like:
primary: true
partner: server2.environment.domain
The above var would exist on server1 since it is the primary and it's
partner is server2
The problem with the above is, I can't expand {{ partner }} in the above
fact (may not have explained that properly, I can't do this:
{{ hostvars['{{ partner }}']['ansible_eth0']['ipv4']['address'] }} or this
{{ hostavars[{{partner}}]['ansible_eth0']['ipv4']['address'] }}
Anyone have any ideas on how I can manage a primary/secondary
role/membership in a cluster? Actually defining if the host is
primary/secondary is the easy part...but defining it's partner and getting
facts from its partner, I'm not certain of.
Thanks!!
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