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Matthew_Goche_6's avatar
Matthew_Goche_6
Icon for Nimbostratus rankNimbostratus
May 12, 2006

Virtual Server responds to health checks

Hi. I currently have a configuration where a device upstream from my BIG-IP 6400 is doing health checks against the BIG-IP. I also want the health checks to fail if my virtual server is showing down. However, my experience with the monitors show that even if the virt is down the BIG-IP will still respond to the health check on that virt unless the BIG-IP itself is down. Therefore, I'm attempting to write an iRule to redirect the upstream health check in order to somehow cause a failure. I am wondering if anyone else has run into this problem or if any templates exist that could assist me in this effort.

 

 

Matt
application delivery
dev
devops
iRules

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  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    May 12, 2006
    This works quite well on new connection requests:

    
when CLIENT_ACCEPTED {
  if { [active_members MyPool] == 0 } {
    discard
  }
}

    We use this for our Global load balancer communication to our BigIP (it is not an F5 product, yet)
  • Deb_Allen_18's avatar
    Deb_Allen_18
    Historic F5 Account
    May 12, 2006
    Enabling "Action on Service Down" to "Reject" for the pool (in Pool/Properties / Configuration: Advanced) will cause LTM to send a RST in response to requests if all servers in the pool are DOWN.

     

     

    I think that may accomplish your goal without a rule...

     

     

    /deb
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    May 12, 2006
    From my testing, using REJECT on service down will not reselect other available members, which is why I ended up with a rule.