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Keith_Richards_'s avatar
Keith_Richards_
Icon for Nimbostratus rankNimbostratus
Apr 02, 2007

disable pool member on certain conditions

Hi,

 

 

I have a customer that would like to use the Passive Monitoring that is mentioned in the release notes for 9.4:

 

 

"Passive monitoring of pool members

 

The BIG-IP system now includes a feature known as passive monitoring. With passive monitoring, a pool member can be marked down sooner than the customary three successive bigd health check failures. Implementation of this feature requires the use of the iRulesTM feature."

 

 

I aim to write an iRule that tests the response time of a given server each time a client connects and if it responds too slowly then it will I want to disable sessions going to that server (ideally prevent even persistent connections to continue going to that server). I thought to get started I would see if I could use an iRule to set the status of a member and tried the following:

 

 

when CLIENT_ACCEPTED {

 

log local0. "Keith Rule hit OK!"

 

set [LB::status pool keithpool member 10.41.0.21 80] down

 

}

 

 

But despite the log showing that the rule matched when I connect to the VS the status of that pool member doesn't change and I don't see any other error messages.

 

 

Hope you can help, thanks, Keith

 

 

 

application delivery
dev
devops
iRules
  • Emilio_Torres_2's avatar
    Emilio_Torres_2
    Historic F5 Account
    Jan 06, 2009
    Hi to all. I understand that LB::status command just recover or validate the state of the pool member, this command can't change their status. Then for the sentence "LB::status pool keithpool member 10.41.0.21 80 down" the irule just return 1 if the pool member (10.41.0.21:80) is down and returns 0 is up or other, but don't put down the member, just check their status. At least that is the behavior that i saw in my tests.

     

     

    Best Regards.