Symptoms

DNS records are not synchronized with the slave DNS servers. On the OBAS container:

[root@obas ~]# dig axfr example.com @localhost
....
....
;; global options:  printcmd
;; connection timed out; no servers could be reached

So zone transfers are prohibited in the PowerDNS server. Restarting pdns service fixes the issue:

# /etc/init.d/pdns restart

Cause

OBAS is installed on the EOLed Virtuozzo 4.0.

Resolution

Upgrade Virtuozzo on the management node to the version 4.7

Workaround:

Create a periodic task on the OBAS node for restarting pdns service each hour with the following script (please set permissions to 755 for this script):

/etc/cron.hourly/pdns
--->8---
#!/bin/sh

/etc/init.d/pdns restart
---8<---    

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