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Forum Discussion

Rick_110395's avatar
Rick_110395
Icon for Nimbostratus rankNimbostratus
Aug 08, 2011

iRule behavior when pools are down

For example......in this iRule what would happen if a connection was initiated to "host1.domain.com", but srvpool1 is down. What would the iRule do with the connection?       when HTTP_REQUES...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Aug 08, 2011
Hi Rick,

 

 

TMM would send a TCP reset as if the iRule wasn't there and the default pool was down. If you want to check the status of the pool before assigning it, you can use active_members. Or you could use the LB_FAILED event to handle this after a load balancing failure occurs.

 

 

http://devcentral.f5.com/wiki/iRules.active_members.ashx

 

http://devcentral.f5.com/wiki/iRules.lb_failed.ashx

 

 

You could also replace the if/elseif/else chain with a switch statement:

 

http://devcentral.f5.com/wiki/iRules.switch.ashx

 

 

Aaron