VMware vSphere

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  • 1.  VSphere HA Cluster failure when downing VCenter Server

    Posted Jul 11, 2009 09:22 PM

    Today I took down my VCenter server for maintenance. A short time later, my 2 node VSphere HA Cluster went offline as well as all running guests. When I brought the VCenter Server back up, both HA hosts had to reinstall the HA Agent then power on the guest VMs.

    In the logs, I saw this entry for each host. For host XYZ.domain.com running guests example1 and example2:

    Host XYZ.domain.com in (datacenter) is not responding

    example1 on host XYZ.domain.com in (datacenter) is disconnected

    example2 on host XYZ.domain.com in (datacenter) is disconnected

    The other cluster node has a similar log, where it said itself is not responding and all the running VMs on it say they are disconnected.

    Any ideas why this would happen?



  • 2.  RE: VSphere HA Cluster failure when downing VCenter Server
    Best Answer

    Posted Jul 11, 2009 09:45 PM

    Where is your DNS placed?


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    VMware vExpert '2009

    http://blog.vadmin.ru



  • 3.  RE: VSphere HA Cluster failure when downing VCenter Server

    Posted Jul 11, 2009 09:47 PM

    Ah ha. Primary DNS server was down as well. Secondary should have been up, but I cannot verify that at this time.

    It could very well have been the issue. Is there a way I can make host table entries on ESXi to prevent a DNS outage from taking down the cluster?



  • 4.  RE: VSphere HA Cluster failure when downing VCenter Server

    Posted Jul 11, 2009 10:01 PM

    Secondary DNS seems to be working, but the Seconday DNS server is one of the VMs that ended up getting powered off in the event, so it went through a reboot. No way to tell what state it was in at the time.



  • 5.  RE: VSphere HA Cluster failure when downing VCenter Server

    Posted Jul 11, 2009 10:01 PM

    Alt-F1 in server console, type 'unsupported' and standard way, /etc/hosts


    ---

    VMware vExpert '2009

    http://blog.vadmin.ru