DNS Clustering 101

Mauritz

• June 05, 2015 10:32

We want to setup DNS clustering but having had a couple of near crashes, I would rather want to make sure I am setting it up correctly. We have a primary server which currently acts as ns1 and ns2 (we only have the 2 at the moment) which both points back to the primary server through different IP addresses. We've also just setup a DNS only server. 1) Which of the 2 servers will be considered the master server for clustering? 2) Is there any way that any of the DNS information could get lost when syncing due to incorrect master/slave setup? 3) When a new server is added, do I use the same DNS only server as a slave? 4) Am I right to then say that ns1 and ns2 will remain the same and I will just add a ns3 at the registrar which will point to the dns only server? Please mind my obvious learning curve :)

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  cPanelMichael

  • June 05, 2015 15:51

  Hello, The following document is a good place to get started:

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  Mauritz

  • June 05, 2015 16:24

  Hi Michael, If I understand this correctly, the recommended setup is to have a seperate dns only server for each nameserver, effectively removing the nameserver functionality completely from the production server. Each production server will then within the cluster work as a primary server which pushes it's data to the dns-only servers. If we get a new server, we will replicate this functionality. Production servers should always only sync to the DNS only server and I assume should be write only so that it does not sync data from the dns only servers, only to it? I hope this all makes sense, thank you!

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  cPanelMichael

  • June 05, 2015 16:32

  Hello, Yes, your understanding of the ideal configuration is accurate. Thank you.

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  Mauritz

  • June 06, 2015 07:49

  I have setup 4 independant dns-only servers and called them ns1,ns2,ns3 and ns4. To setup syncing, would I setup syncing on the master to push to those slaves, or do I log into each slave and add the master? Ideally I want a master > slave but if the slave needs to query the master that's fine as well. How would I go about ensuring it is indeed working the way I intend it to?

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  cPanelMichael

  • June 08, 2015 12:35

  To setup syncing, would I setup syncing on the master to push to those slaves, or do I log into each slave and add the master?

  
  Hello, Yes, you configure synchronization on the hosting servers, rather than the DNS-Only servers. You can enable "Setup Reverse Trust Relationship" when adding the DNS-Only servers to the cluster to ensure the DNS-Only servers trust the hosting server. Thank you.

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