Best Practice for Authoritative Servers in 2 Data Centers.

[#1]

Hi,

All the while we were using one Authoritative Grid Master in one Data Center. As this is Single Point of failure. We decided to install one Gridmaster candidate in 2nd Data center however not actve yet as we still checking with the 2 ISPs which are secondary dns servers , how they can configure 2  public IPs of our same SOA in DC1  and DC2 .

Please advise the best practice if  2 Authoritative servers in 2 different Datacenters setup with 2 ISPs  -- SOA with 2 Public IPs.  

Is ISP can setup  pool of 2 IP address and one become unreachable will it use second public IP for our second data center.

Thanks.

[#2 · Accepted solution]

SudheerKumar,

If your two ISPs are secondary DNS servers, then you need to do zone transfers from the primary to the secondary DNS servers.  This will preserve the SOA record.  If a change to the authoritative zone is done, then the SOA serial number is changed and the changes are propagated as a zone transfer. In order to use your 2 secondary ISP DNS servers, I would find out if they support ANYCAST using BGP or OSPF. Anycast allows you to use the same IP address for the DNS.  If one becomes unavailable, the routing protocol takes over for routing the DNS request to the active DNS server.

Hope this helps.

Thomas

[#3]

Thanks for the answer.

When ISP configure our 2 DNS Servers with 2 different public IPs How do they configure SOA

Is it possible to configure Primary SOA and Backup SOA