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Forum Discussion

RandyTittleman's avatar
RandyTittleman
Icon for Altostratus rankAltostratus
Aug 19, 2015

GTM load balancing between two IP's, but one physical box

I think I know the answer to this, but I would like to confirm with the community.   Here is the scenario:   I have two datacenters. One of the application teams have one physical server in da...
availability
BIG-IP DNS
design
Hamish's avatar
Hamish
Icon for Cirrocumulus rankCirrocumulus
Aug 19, 2015

Huh?

 

How do they plan on the DR address (That belongs in DC B) getting traffic routed to it when they configure it in DC A?

 

Or have I missed something here? Yes, I noticed it's a test, or I would have brought up the fact that doing DR to the same site isn't actually DR :)

 

Note that apart from monitoring of non-bigip servers... GTM doesn't 'send' traffic to servers at all... I'm also a bit confused by you asking about GTM and then stating they'll change DNS... GTM is all about providing a dynamic address resolution capability that depends on availability of target IP's...

 

Best practice would be to configure two pools (one for each datacenter) for the URL on the GTM and use Global Availability to send traffic to the next available pool.

 

Ahh... Kind of... Being a little pedantic GTM doesn't give a hoot about the URL. GTM cares about the FQDN portion of the URL to IP address resolution. The highly available FQDN is referred to as the WideIP on GTM (Not sure I 100% like the terminology, but at least it's unique & kind of catchy :) )

 

But yes, to use GTM, you'd configure two pools. One for DC A and one for DC B then configure the algorithm for the WideIP to Global Availability (Which selects the pools in order listed, based on whether they're up or not. Pool A will get all the traffic unless it's down, in which case poolB gets it).

 

H