Re: change of dns names and IP addresses of cluster members

Henrik Korkuc <lists@xxxxxxxxx> · Fri, 22 Jul 2016 15:04:36 +0300



    On 16-07-22 13:33, Andrei Mikhailovsky
      wrote:

    
        Hello

        
        We are planning to make changes to our IT infrastructure
          and as a result the fqdn and IPs of the ceph cluster will
          change. Could someone suggest the best way of dealing with
          this to make sure we have a minimal ceph downtime?

        
    Can old and new network reach each other? If yes, then you can do it
    without cluster downtime. You can change OSDs IP on server by server
    basis - stop OSDs, rename host, change IP, start OSDs. They should
    connect to cluster with new IP. Rinse and repeat for all.

    
    As for mons you'll need to remove mon out of the cluster, then readd
    with new name and IP, redistribute configs with new mons. Rinse and
    repeat.

    
    Depending on your use case it is possible that you may have client
    downtime as sometimes it is not possible to change client's config
    without a restart (e.g. qemu machine config)

    
        Many thanks

        
        Andrei

        
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