Forum Discussion

HG's avatar
HG
Icon for Cirrus rankCirrus
Oct 20, 2017

GTM Global availability Maintenance page I-rule

Hi all. I'm trying to set up GTM module by using global availability algorithm on wide IP level. That way as long as my primary datacenter (A) is up no loadbalancing will take place. The concept is that both datacenters ( A=primary , B=secondary ) will have active F5 units up and running but VS and Pools will not act the same way,meaning that once datacenter A is down then replication will take place on the back end. Hence, datacenter B will not have available resources running in parallel. I observed that there is an option of using I-rules on GTM Wide IPs level and I would like your help in order to pop up a maintenance page. Is it possible to create an i-rule (GSLB -> irules) when a dns request takes place and pop up a maintenance page using ifile when there are no resources available on both sides ?? Thanks in advance.

 

BIG-IP DNS
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iRules
  • Only1masterbla1's avatar
    Only1masterbla1
    Icon for Cirrus rankCirrus
    Oct 27, 2017

    You may try using "Last Resort Pool" option. This pool member can have appropriate maintenance page.

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    Oct 27, 2017

    Hi,

     

    The only gtm capability is to manage DNS REQUEST / RESPONSE.

     

    Maintenance page is managed in HTTP context.

     

    You can configure maintenance page on LTM

     

    • if DC A VS is not available, DC A LTM will display maintenance page but GTM will send DC B addresses
    • of both VS are not available, GTM will reply with 2 addresses (return to DNS) and both LTM will display maintenance page.