I am hoping that someone can help me understand the problems I'm having with linux clustering for VMs.

I am clustering 2 VMs on two separate VM hosts, trying to ensure that a service is always available. The hosts and guests are both RHEL 6.7. The goal is to have only one of the two VMs running at a time.

The configuration works when we test/simulate VM deaths and graceful VM host shutdowns, and administrative switchovers (i.e. clusvcadm -r ).

However, when we simulate the sudden isolation of host A (e.g. ifdown eth0), two things happen 1) the VM on host B does not start, and repeated fence_xvm errors appear in the logs on host B 2) when the 'failed' node is returned to service, the cman service on host B dies.

This is my cluster.conf file (some elisions re: hostnames)

<?xml version="1.0"?>
<cluster config_version="14" name="clustername">
    <fence_daemon/>
    <clusternodes>
        <clusternode name="hostA.fqdn" nodeid="1">
            <fence>
                <method name="VmFence">
                    <device name="virtfence1" port="jobhistory"/>
                </method>
            </fence>
        </clusternode>
        <clusternode name="hostB.fqdn" nodeid="2">
            <fence>
                <method name="VmFence">
                    <device name="virtfence2" port="jobhistory"/>
                </method>
            </fence>
        </clusternode>
    </clusternodes>
    <cman expected_votes="1" two_node="1"/>
    <fencedevices>
<fencedevice agent="fence_xvm" key_file="/etc/cluster/fence_xvm_hostA.key" multicast_address="239.255.1.10" name="virtfence1"/> <fencedevice agent="fence_xvm" key_file="/etc/cluster/fence_xvm_hostB.key" multicast_address="239.255.2.10" name="virtfence2"/>
    </fencedevices>
    <rm>
        <failoverdomains/>
        <resources/>
<vm autostart="1" name="jobhistory" recovery="restart" use_virsh="1"/>
    </rm>
    <logging/>
</cluster>


Thanks for any help you can offer,
  Kelvin Edmison

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