Forum Discussion

uni's avatar
uni
Icon for Altocumulus rankAltocumulus
Dec 02, 2013

Offline 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...
application delivery
BIG-IP DNS
design
gtm
IheartF5_45022's avatar
IheartF5_45022
Icon for Nacreous rankNacreous
Dec 03, 2013

So why don't you use Fallback IP? The IP will be one of the virtuals from your main pool. On that LTM virtual will be an iRule that has an LB_FAILED event showing a sorry page. It will have a pool attached and so will show as up/down on LTM status.

 

Seems way simpler than mucking about with Last Resort Pools on GTM and LTM virtuals with no default pool attached, and definitely fulfils the "can you get the GTM to use an LTM VS even if it is flagged down by iquery" issue unless there is more to it than that?

 

  • uni's avatar
    uni
    Icon for Altocumulus rankAltocumulus
    Dec 03, 2013
    I agree, and we did.
  • uni's avatar
    uni
    Icon for Altocumulus rankAltocumulus
    Dec 03, 2013
    But perhaps I should add, that doesn't cover all cases. Given fallback IP is that of vs-b, if vs-a goes down and ltm-b is down, we won't present the page, but potentially could if we can send traffic to ltm-a. This is such an unusual case though, and I decided it was not worth the mucking* around required. * Not actually the word I mean