Forum Discussion
NimbostratusTrying to force down a VIP via a health monitor, is there a better way?
I have a vip that does not have default pool assigned (for a variety of reasons). We use an irule to direct traffic to 1 of 2 pools based on certain criteria. However, I need to be able to disable the vip if there are zero nodes available in either pool. I have an external monitor created that checks the number of available pool members and can disable the vip. My problem is that if I assign this monitor to either pool the script runs for the number of nodes in each pool. So if have have 2 nodes in 2 pools it runs 4 times. I only want it to run once. Would I be better off moving this check to the irule associate with the vip instead? Or is there a better way to accomplish this? Thank you in advance.
3 Replies
AlexDeMarcoI think I may be over complicating things..
If I add this to the Irule attached to the vip: when CLIENT_ACCEPTED { if { [active_members DEV_7099] < 1 and [active_members DEV_7002] < 1 }{ reject log local0. "[IP::client_addr] - Client rejected. Active members of MyPoolName dropped below 3." } else { return } }
Is this the same as the same behavior as if the vip was disabled??
The only difference is that when a vip is down or disabled it won't accept any traffic.
Your iRule will have to finish the 3way handshake to execute the reject.
Cheers,
Kees
IheartF5_45022Nacreous
It will behave the same, however it won't show as 'disabled'.
BTW the 'reject' is CLIENT_ACCEPTED is fine - you don't need to complete 3-way handshake.
HOWEVER active_members won't work unless you have monitors assigned - there's something wrong with the logic here.......
