Forum Discussion
Glenn_32974
Nimbostratus
NimbostratusHow to check pool availability whit-in an irule
This might be a simple question for you all but I was wondering if there's a way to re-direct traffic to a different pool in case Pool used with-in an irule declaration happens to be down?
Can you check for pool availability within the irule?
let say I have the following irule that directs traffic based on client ip address
What happenss in the event Pool_Global is down?
When CLIENT_ACCEPTED{
if {[IP::addr [IP::client_addr] eq "10.44.17.9" {
use pool Pool_Global
if pool Pool_Global is down...
use pool Pool_other
}
}
makes sense?
3 Replies
Ben_95489Hey Glenn,
This can definitely be done. There are some neat examples in the LB::reselect page ( http://devcentral.f5.com/wiki/default.aspx/iRules/LB__reselect.html ) even. Depending on your version you can even do some nifty in-line monitoring with the LB::down and LB::up commands ( http://devcentral.f5.com/wiki/default.aspx/iRules/LB__down.html - http://devcentral.f5.com/wiki/default.aspx/iRules/LB__up.html ).
Hope this helps a bit.
// Ben
hoolioCirrostratus
You can also check whether a pool has any active members using [active_members $pool_name]:
http://devcentral.f5.com/wiki/default.aspx/iRules/active_members
Aaron- Glenn_32974Hey Ben
Thanks a lot for pointing the right direction. In consequence I was able to achieved pool member availability within the irule
when CLIENT_ACCEPTED {
switch [IP::client_addr] {
"10.44.17.12" {
if {[LB::status node 190.144.35.15] eq "up"}{
rateclass Factura_Digital
snatpool Factura_Electronica_aivmso_Telmex
use pool Pool_Telmex
log local0. "IP address : [IP::client_addr] - aivmso going out via [LB::server addr] Telmex!!! "
} else {
rateclass Factura_Digital
snatpool Factura_Electronica_aivmso_Global
use pool Pool_Global
log local0. "IP address: [IP::client_addr] - aivmso going out via [LB::server addr] Global !!!"
}
}
be safe!
