Forum Discussion
uni
Altocumulus
AltocumulusOffline page as last resort with GTM
We have a requirement to present a service unavailable page when all GTM pool members are down, but can't really afford to dedicate new IP addresses at each site just for this.
There are two ind...
IheartF5_45022
Nacreous
NacreousYes you can - using Fallback IP - you don't specify a virtual name, you specify an IP address. Even if that happens to be the same as a virtual that GTM thinks is down, it will return the Fallback IP as DNS response if your LTM virtuals are down.
uniYes, you're right. I had Last Resort Pool on my mind, so that's what I "read". So, what I thought was ideal, was to have a last resort pool, same members as the "main" pool, but then last resort members go 'red', and won't be used in the LB decision. We came up with a solution, but it is stretching the KISS principle a bit: gtm has a pool and last resort pool. Main pool monitors a url on the VS which is supplied by an irule depending on pool member availability. Last resort pool a simple http monitor. Virtuals have no default pool, they have a rule which responds to the gtm monitor request, and for other requests either responds with the offline page or sets the pool depending on member availability. I would love to hear a better way, and I will be impressed by anyone who tries to understand what I just wrote.
