This question builds on questions I was talking to kgaillot on IRC.
I am try to prevent a resource from being allowed to migrate to
or start on a given node. When I asked about this, Ken talked
about node attributes, which I've been trying to implement.
To try to figure this out / test this, I setup an attribute against a resource called 'srv01-sql' called 'drbd-fenced_srv01-psql' that sets a location constraint of -INFINITY. I had the resource running on 'mk-a01n01' and then set 'drbd-fenced_srv01-psql=1' to trigger the constraint against 'mk-a01n02'. I verified this was set, then tried migrating it, and it happily migrated.
Clearly I am missing something. :)
====
[root@mk-a01n01 ~]# crm_attribute --type nodes --node mk-a01n02
--name drbd-fenced_srv01-sql --query
scope=nodes name=drbd-fenced_srv01-sql value=1
[root@mk-a01n01 ~]# pcs constraint location config
Location Constraints:
Resource: srv01-sql
Enabled on:
Node: mk-a01n02 (score:100)
Node: mk-a01n01 (score:200)
Constraint: location-srv01-sql
Rule: score=-INFINITY
_expression_: drbd-fenced_srv01-sql eq 0
Resource: srv02-web
Enabled on:
Node: mk-a01n02 (score:100)
Node: mk-a01n01 (score:200)
[root@mk-a01n01 ~]# crm_attribute --type nodes --node mk-a01n02
--name drbd-fenced_srv01-sql --query
scope=nodes name=drbd-fenced_srv01-sql value=1
[root@mk-a01n01 ~]# pcs resource status srv01-sql
* srv01-sql (ocf::alteeve:server): Started mk-a01n01
[root@mk-a01n01 ~]# pcs constraint location srv01-sql prefers
mk-a01n02=200 mk-a01n01=100
[root@mk-a01n01 ~]# pcs resource status srv01-sql
* srv01-sql (ocf::alteeve:server): Migrating mk-a01n01
[root@mk-a01n01 ~]# pcs resource status srv01-sql
* srv01-sql (ocf::alteeve:server): Started mk-a01n02
====
I feel like this shouldn't be so complicated, so I am likely
over-thinking this, or missing something obvious...
-- Madison Kelly Alteeve's Niche! Chief Technical Officer c: +1-647-471-0951 https://alteeve.com/
_______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
