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Re: [Linux-cluster] Need help setting up pacemaker-cluster with drbd & mysql



Have you had a look at the Linbit Tech Guide "MySQL High Availability on the Pacemaker Cluster Stack"?

Eric Pretorious
Truckee, CA


From: "Jäger, Marcus" <marcus jaeger mcn-tele com>
To: "'linux-cluster redhat com'" <linux-cluster redhat com>
Sent: Thursday, February 7, 2013 12:19 PM
Subject: [Linux-cluster] Need help setting up pacemaker-cluster with drbd & mysql

Hello there,
 
I’m new in setting up  pacemaker and need some help.
 
My config is similar to the following howto:
 
http://blog.non-a.net/2011/03/27/cluster_drbd
 
The only modification is use of mysql instead of apache2.
 
At first time try, everything worked fine. Both nodes came up and the ha1-node went in service.
If ha1 failed (reboot/shutdown) ha2 took all services.
If ha1 came online again it took all resources again, just as excepted.
BUT: If ha2 went offline and came online again, resource drbd didn’t came online again, cause it detected a split-brain and corosync kept starting and stopping drbd on ha2.  (Drbd had to resnyc the whole disk every time it failed.)
 
Maybe I fixed that by modifying /etc/drbd.d/global_common.conf and added “ disk { fencing resource only; } Don’t know exactly, but if ha2 disconnects and connects again no full-sync happens right now.
 
But at the end I’m getting confused.
Actually only ha1-node can become Master and if ha1 fails, ha2 does not take the resources and stays slave.
I’m now trying almost 2 days to figure out the problem. Google dind’t help at all.
 
crm_mon --one-shot –V says:
 
Stack: openais
Current DC: mysql-drbd-ha2 - partition with quorum
Version: 1.0.9-74392a28b7f31d7ddc86689598bd23114f58978b
2 Nodes configured, 2 expected votes
3 Resources configured.
============
 
Online: [ mysql-drbd-ha1 mysql-drbd-ha2 ]
 
Resource Group: lvm
     datavg     (ocf::heartbeat:LVM):   Started mysql-drbd-ha1
     fs_mysql   (ocf::heartbeat:Filesystem):    Started mysql-drbd-ha1
Resource Group: mysql_grp
     app_ip     (ocf::heartbeat:IPaddr):        Started mysql-drbd-ha1
     app_mysql  (lsb:mysql):    Started mysql-drbd-ha1
Master/Slave Set: ms_drbd
     Masters: [ mysql-drbd-ha1 ]
     Slaves: [ mysql-drbd-ha2 ]
 
Failed actions:
    drbd:0_promote_0 (node=mysql-drbd-ha2, call=158, rc=1, status=complete): unknown error
 
after crm node standby of ha1-node it says
 
Node mysql-drbd-ha1: standby
Online: [ mysql-drbd-ha2 ]
 
Resource Group: lvm
     datavg     (ocf::heartbeat:LVM):   Started mysql-drbd-ha2
     fs_mysql   (ocf::heartbeat:Filesystem):    Started mysql-drbd-ha2
Resource Group: mysql_grp
     app_ip     (ocf::heartbeat:IPaddr):        Started mysql-drbd-ha2
     app_mysql  (lsb:mysql):    Started mysql-drbd-ha2
Master/Slave Set: ms_drbd
     Masters: [ mysql-drbd-ha2 ]
     Stopped: [ drbd:1 ]
 
After “crm node online” on ha1 it still is like:
 
Online: [ mysql-drbd-ha1 mysql-drbd-ha2 ]
 
Resource Group: lvm
     datavg     (ocf::heartbeat:LVM):   Started mysql-drbd-ha2
     fs_mysql   (ocf::heartbeat:Filesystem):    Started mysql-drbd-ha2
Resource Group: mysql_grp
     app_ip     (ocf::heartbeat:IPaddr):        Started mysql-drbd-ha2
     app_mysql  (lsb:mysql):    Started mysql-drbd-ha2
Master/Slave Set: ms_drbd
     Masters: [ mysql-drbd-ha2 ]
     Stopped: [ drbd:1 ]
 
 
Ha1 won’t become master again, unless I stop both nodes, clear the crm config and reload it.  That’s not working for productive use at all.
 
If you need configs and logs, please write.
 
Thanks in advance and greetings from Frankfurt/Main, Germany
 
Marcus
 



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