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Forum Discussion

Puneet_73909's avatar
Puneet_73909
Icon for Nimbostratus rankNimbostratus
Dec 16, 2009

LB_Failed redirection

We need the LB to look at its pool of webServers and if the primary pool members are down, then redirect the incoming requests to another webServer and obviously display what that webServer is returni...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Dec 16, 2009
Do you want to select the second pool at the time of the initial request or only when load balancing fails? If the former, can you change the event from LB_FAILED to CLLIENT_ACCEPTED or HTTP_REQUEST?

If the latter, can you try using LB::reselect: 

 
 when LB_FAILED { 
    if { [active_members [LB::server pool]] < 1 } { 
       snatpool PROD_WebSrvrs 
       LB::reselect pool pool_7185 
    } 
 }

Here are a few related examples:

Help with avoiding Reselect bug in LB_Failed

http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&tpage=1&view=topic&postid=34031

downing a member from LB_FAILED

http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&tpage=1&view=topic&postid=62849

Aaron