Forum Discussion
gamm_31377
Nimbostratus
NimbostratusFind pool member from cookie
Hello, I need to find the selected pool member from a persistence(insert) cookie. I saw this example but it didn't work. The [HTTP::cookie PersistCookie] returns this:69941258.20480.0000 but when I "set pserver [persist lookup uie [[HTTP::cookie PersistCookie]]" the $pserver is null
Any idea ?
when HTTP_REQUEST { set pserver [persist lookup uie [HTTP::cookie PersistCookie]] if { [LB::status pool http_pool member $pserver 80] eq "up" } { pool http_pool member $pserver 80 } else {
2 Replies
StephanMantheyNacreous
Hi gamm,
in case you are using cookie insert as persistence method this article from Debbie describes a method to decode it.
Cookie insert works different from universal persistence.
Cookie insert does not create table entries. Instead the returning client provides the information with the cookie. That´s why you will get an empty string after looking up the persistence table.
With universal persistence the virtual server will parse the real servers (pool members) response and create a table entry with a timeout.
The persistence table lookup you are using would return an information about pool, member and port.
So you would need to apply a string split to pick the pool member IP address. Did you name the cookie in the persistence profile as described in your request? Just apply Debbie´s iRule with adjusted cookie name to decode it. Please note that the iRule still has to be modified to work in v11.
Thanks, Stephan
Brad_ParkerCirrus
Any reason you can't just use cookie persistence? Your iRule looks like its trying to do exactly what the normal persistence would do.
