[ClusterLabs] Preferred location is sometimes ignored

Auer, Jens jens.auer at cgi.com
Fri Sep 16 14:45:27 UTC 2016


Hi,

I have a Active/Passive configuration with a drbd mast/slave resource:

MDA1PFP-S01 14:40:27 1803 0 ~ # pcs status
Cluster name: MDA1PFP
Last updated: Fri Sep 16 14:41:18 2016        Last change: Fri Sep 16 14:39:49 2016 by root via cibadmin on MDA1PFP-PCS01
Stack: corosync
Current DC: MDA1PFP-PCS02 (version 1.1.13-10.el7-44eb2dd) - partition with quorum
2 nodes and 7 resources configured

Online: [ MDA1PFP-PCS01 MDA1PFP-PCS02 ]

Full list of resources:

 Master/Slave Set: drbd1_sync [drbd1]
     Masters: [ MDA1PFP-PCS02 ]
     Slaves: [ MDA1PFP-PCS01 ]
 mda-ip    (ocf::heartbeat:IPaddr2):    Started MDA1PFP-PCS02
 Clone Set: ping-clone [ping]
     Started: [ MDA1PFP-PCS01 MDA1PFP-PCS02 ]
 ACTIVE    (ocf::heartbeat:Dummy):    Started MDA1PFP-PCS02
 shared_fs    (ocf::heartbeat:Filesystem):    Started MDA1PFP-PCS02

PCSD Status:
  MDA1PFP-PCS01: Online
  MDA1PFP-PCS02: Online

Daemon Status:
  corosync: active/disabled
  pacemaker: active/disabled
  pcsd: active/enabled

MDA1PFP-S01 14:41:19 1804 0 ~ # pcs resource --full
 Master: drbd1_sync
  Meta Attrs: master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
  Resource: drbd1 (class=ocf provider=linbit type=drbd)
   Attributes: drbd_resource=shared_fs
   Operations: start interval=0s timeout=240 (drbd1-start-interval-0s)
               promote interval=0s timeout=90 (drbd1-promote-interval-0s)
               demote interval=0s timeout=90 (drbd1-demote-interval-0s)
               stop interval=0s timeout=100 (drbd1-stop-interval-0s)
               monitor interval=60s (drbd1-monitor-interval-60s)
 Resource: mda-ip (class=ocf provider=heartbeat type=IPaddr2)
  Attributes: ip=192.168.120.20 cidr_netmask=32 nic=bond0
  Operations: start interval=0s timeout=20s (mda-ip-start-interval-0s)
              stop interval=0s timeout=20s (mda-ip-stop-interval-0s)
              monitor interval=1s (mda-ip-monitor-interval-1s)
 Clone: ping-clone
  Resource: ping (class=ocf provider=pacemaker type=ping)
   Attributes: dampen=5s multiplier=1000 host_list=pf-pep-dev-1 timeout=1 attempts=3
   Operations: start interval=0s timeout=60 (ping-start-interval-0s)
               stop interval=0s timeout=20 (ping-stop-interval-0s)
               monitor interval=1 (ping-monitor-interval-1)
 Resource: ACTIVE (class=ocf provider=heartbeat type=Dummy)
  Operations: start interval=0s timeout=20 (ACTIVE-start-interval-0s)
              stop interval=0s timeout=20 (ACTIVE-stop-interval-0s)
              monitor interval=10 timeout=20 (ACTIVE-monitor-interval-10)
 Resource: shared_fs (class=ocf provider=heartbeat type=Filesystem)
  Attributes: device=/dev/drbd1 directory=/shared_fs fstype=xfs
  Operations: start interval=0s timeout=60 (shared_fs-start-interval-0s)
              stop interval=0s timeout=60 (shared_fs-stop-interval-0s)
              monitor interval=20 timeout=40 (shared_fs-monitor-interval-20)

MDA1PFP-S01 14:41:35 1805 0 ~ # pcs constraint --full
Location Constraints:
  Resource: mda-ip
    Enabled on: MDA1PFP-PCS01 (score:50) (id:location-mda-ip-MDA1PFP-PCS01-50)
    Constraint: location-mda-ip
      Rule: score=-INFINITY boolean-op=or  (id:location-mda-ip-rule)
        Expression: pingd lt 1  (id:location-mda-ip-rule-expr)
        Expression: not_defined pingd  (id:location-mda-ip-rule-expr-1)
Ordering Constraints:
  start ping-clone then start mda-ip (kind:Optional) (id:order-ping-clone-mda-ip-Optional)
  promote drbd1_sync then start shared_fs (kind:Mandatory) (id:order-drbd1_sync-shared_fs-mandatory)
Colocation Constraints:
  ACTIVE with mda-ip (score:INFINITY) (id:colocation-ACTIVE-mda-ip-INFINITY)
  drbd1_sync with mda-ip (score:INFINITY) (rsc-role:Master) (with-rsc-role:Started) (id:colocation-drbd1_sync-mda-ip-INFINITY)
  shared_fs with drbd1_sync (score:INFINITY) (rsc-role:Started) (with-rsc-role:Master) (id:colocation-shared_fs-drbd1_sync-INFINITY)

As you can see I have defined a location constraint for the virtual ip mda-ip and colocated the drbd master and filesystem. However, this constraint is sometimes ignored. Can anybody point me to the correct configuration?

Is there a way to get more debugging output from pcs, e.g. what triggered actions, which scores are computed and from which values?

Best wishes,
  Jens

--
Jens Auer | CGI | Software-Engineer
CGI (Germany) GmbH & Co. KG
Rheinstraße 95 | 64295 Darmstadt | Germany
T: +49 6151 36860 154
jens.auer at cgi.com<mailto:jens.auer at cgi.com>
Unsere Pflichtangaben gemäß § 35a GmbHG / §§ 161, 125a HGB finden Sie unter de.cgi.com/pflichtangaben<http://de.cgi.com/pflichtangaben>.

CONFIDENTIALITY NOTICE: Proprietary/Confidential information belonging to CGI Group Inc. and its affiliates may be contained in this message. If you are not a recipient indicated or intended in this message (or responsible for delivery of this message to such person), or you think for any reason that this message may have been addressed to you in error, you may not use or copy or deliver this message to anyone else. In such case, you should destroy this message and are asked to notify the sender by reply e-mail.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clusterlabs.org/pipermail/users/attachments/20160916/11f32d66/attachment-0003.html>


More information about the Users mailing list