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https://docs.ceph.com/docs/master/releases/nautilus/#nautilus-old-upgrade

1. Upgrade ceph-mon's, one at a time. For each do:
   
   1. Set puppet-branches to a tag/branch containing nautilus ceph
   2. Do a puppet-run
   3. Update the ceph-packages on a ceph-mon
      1. apt-get install ceph-mon
   4. Restart the ceph-mon
      
      1. systemctl restart ceph-mon.target