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Potential issues running with RHEL 7.4 or CentOS 7.4

Problem:

We have had reports of customers experiencing the following issues when running with RHEL 7.4 or CentOS 7.4 (which are currently unsupported):

  • Zeneventserver times out and/or crashes

  • Deletion of files takes a very long time from the /opt/serviced/var/volumes/<instanced id>/zeneventserver/index directory

Remediation:

While we are still investigating the root cause, there may be a defect with file locking when using NFS 4.1 with RHEL or CentOS 7.4. Customers using RHEL/CentOS 7.4 should force the use of NFS to 4.0, as we've seen positive results doing this to some affected users. To do this, follow these steps:

  • Find /etc/nfsmount.conf on each of their hosts
    • Find the following line
      # Defaultvers=4
    • Uncomment it and change it so that it looks like.
      Defaultvers=4.0
    • Save that file
  • Stop Resource Manager and serviced on all of their hosts where NFS is mounted
  • On each host, issue: systemctl restart nfs-server
  • Bring serviced back up and start resource manager
  • Once the nfs shares are remounted, verify that NFS mounts are using NFS version 4.0 by running: nfsstat -m on the delegates in the RM pool

    [root@delegate1 ~]# nfsstat -m
    /opt/serviced/var/volumes/afwdlj8lpc6n6fk3rojbfq7lt from 10.10.123.123:/serviced_volumes_v2/afwdlj8lpc6n6fk3rojbfq7lt
    Flags:
    rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.10.123.124,local_lock=none,addr=10.10.123.123

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