[Pacemaker] Split brain and STONITH behavior (VMware fencing)

Ariel S ariel_bis2030 at yahoo.co.id
Wed Oct 29 07:46:52 UTC 2014


Hello,

I'm trying to understand how this STONITH works.

I have 2 VMware VMs (moon1a, moon1b) on two different hosts. Each have 2 nic
assigned: eth0 for heartbeat while eth1 used for everything else.

This is my testing configuration:

     node $id="168428034" moon1a
     node $id="168428035" moon1b
     primitive Foo ocf:heartbeat:Dummy
     primitive stonith_moon1a stonith:fence_vmware_soap \
             params ipaddr="192.168.1.134" login="foo" \
                     uuid="42053b22-d3fd-25fe-6fb3-7cb2c7cd2c63" \
                     action="off" verbose="true" passwd="bar" \
                     ssl="true" \
             op monitor interval="60s"
     primitive stonith_moon1b stonith:fence_vmware_soap \
             params ipaddr="192.168.1.134" login="foo" \
                     uuid="4205b986-4426-5de4-1069-b10a77123bc4" \
                     action="off" verbose="true" passwd="bar" \
                     ssl="true" \
             op monitor interval="60s"
     clone FooClones Foo
     location loc_stonith_moon1a stonith_moon1a -inf: moon1a
     location loc_stonith_moon1b stonith_moon1b -inf: moon1b
     property $id="cib-bootstrap-options" \
             dc-version="1.1.10-42f2063" \
             cluster-infrastructure="corosync" \
             stonith-enabled="true" \
             last-lrm-refresh="1414565715"
     rsc_defaults $id="rsc-options" \
             resource-stickiness="200"


The vCenter is at 192.168.1.134 and the uuids taken from a list generated by
fence_vmware_soap.

When I do fencing manually using:

     # fence_vmware_soap -z -a 192.168.1.134 \
                         -l foo -p bar \
                         -U 4205b986-4426-5de4-1069-b10a77123bc4 \
                         -o off

from moon1a, as expected the moon1b 
(4205b986-4426-5de4-1069-b10a77123bc4) VM
died, so the configuration should be right, I think.

But so far I cant emulate split brain by killing corosync like this:

     # killall -9 corosync


My questions:

     1.    Is my configuration correct?
     2.    How one cause a split-brain to trigger the expected stonith 
behavior?



Thank you,
Ariel





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