Super slow DNS cluster with WHM/cPanel

Synopsis

At times your cPanel DNS cluster will be excruciating slow. Adding or removing DNS zone records will take an inordinate amount of time.

To diagnose the problem, examine this log file, ON ALL SERVERS, whilst adding or removing a record:

tail -f /usr/local/cpanel/logs/dnsadmin_log

You’ll most likely find “Connection Timed Out” filling up / clogging the log.

Look for:

  • Problems with older deleted server
  • Problems with the cluster hierarchy

Other interesting problems

Duplicate dnsuniqid request for “godBAJTaEtbzX9K6Hx9H55u1iQNF84PU_1750726689” from “root@1.2.3.4” ignored.

Ways of troubleshooting

Log in and tail one of the servers that talks to the cluster, e.g.:

[root@server-example-01 ~]# tail -f /usr/local/cpanel/logs/dnsadmin_log

Then log in and tail one of the servers in the cluster:

[root@cluster-node-03 ~]# tail -f /usr/local/cpanel/logs/dnsadmin_log

Make some DNS changes, e.g. add an A record test.example.com to any domain. Watch the log.

You’ll have to sort out all the problems in the log.

Reference

What if this doesn’t work? Log a ticket with cPanel, and good luck. This is advances stuff.

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