Jul 17, 2008
18
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Hi,

Recently I added a new server to my cPanel DNS Cluster. I now have:

server1 - syncronise (WHM 11.40.1)
server2 - syncronise (WHM 11.40.1)
ns1 - cPanel DNS-only - read only (WHM 11.38.2)
ns2 - cPanel DNS-only - read only (WHM 11.38.2)

Server2 will replace Server1 completely over the next few weeks, as i migrate accounts across. However something odd is happening, as when I update DNS to point MX, www, A records etc to the new server, the DNS is being syncronised across the cluster yet even a day later there is no propagation across the internet, and the sites/email etc are still served from the old server.

Typically I have TTLs of 14400, so I would expect a few hours delay, but not more.

This appears to be a new problem, I'm not sure if it's something I've messed up in the cluster config or what.

I even SSH'ed into the two name servers to check that the zonefiles had updated - which they have. But all attempts to query the domains via dig, or intodns.com show the old DNS.

Confused!
 
Jul 17, 2008
18
0
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It seems that no changes of any kind are propagating with my DNS any more. Very weird.

I've never seen anything like this. Doesn't matter whether I add new A records, change existing ones. Nothing is visible to the outside world.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,202
363
Hello :)

You could try restarting the Named service on the DNS-Only machines and rebuilding the DNS configuration via:

Code:
/scripts/rebuilddnsconfig
If the issue persists, could you open a support ticket using the link in my signature so we can take a closer look? You can post the ticket number here so we can update this thread with the outcome.

Thank you.
 
Jul 17, 2008
18
0
51
Disappointing response so far. A cPanel guy spent hours looking at my servers, and basically came up with nothing (well - my sync settings were wrong, but to me that does not explain the total lack of propagation).

I am seeing some domains propagate very slowly (between 24-48 hours which is crazy when all records are on a TTL of 14400 or less).

Something's badly wrong here and I wish I could fix it.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,202
363
To update, it looks like both hosting servers contained the same DNS Zones. Thus, they were sending conflicting records to the DNS-Only servers. The solution here is to modify how the cluster is setup, or to disable clustering for one of the hosting servers.

Thank you.