Forum Discussion
Ben_Lamb_227759
Nimbostratus
NimbostratusPersistence causing problems with redirection iRule?
I have a slightly strange case on website where I am seeing traffic being redirected strangely, and I believe it may be down to my persistence. I was wondering if anyone could advise on if what I am ...
You're missing a else-clause (default action) in your iRule. In other words, once a request lands in your test pool, there's no way to return to default pool (since the balancing decision is already locked in).
when HTTP_REQUEST { Save the name of default pool (as configured in VS Resources Tab) as a variable, before it can be modified by conditional actions below set poolDefault [LB::server pool] if { "[HTTP::host][HTTP::uri]" starts_with "www.website.com/test" } { pool test_pool } else { pool $poolDefault } }Similar problem here: https://devcentral.f5.com/questions/incorrect-load-balancing-when-disabling-oneconnect
Hannes_RappNimbostratus
NimbostratusYou're missing a else-clause (default action) in your iRule. In other words, once a request lands in your test pool, there's no way to return to default pool (since the balancing decision is already locked in).
when HTTP_REQUEST {
Save the name of default pool (as configured in VS Resources Tab) as a variable, before it can be modified by conditional actions below
set poolDefault [LB::server pool]
if { "[HTTP::host][HTTP::uri]" starts_with "www.website.com/test" } {
pool test_pool
} else {
pool $poolDefault
}
}
Similar problem here: https://devcentral.f5.com/questions/incorrect-load-balancing-when-disabling-oneconnect
Ben_Lamb_227759Thanks for that. I don't really understand why that is necessary though. The VS has a default pool set up, which works in the majority of cases. If the HTTP request comes in and doesn't match the 'if' clause, should it not default to the default pool selection specified in the VS? This is what happens for 99% of the traffic directed at www.website.com. The default pool is selected and used. I don't understand what's happening differently in the other 1% of cases, and why this change would have any impact.- Hannes_RappMaybe this thread will answer your questions. I've given a more detailed answer there, so hopefully you can follow the logic. https://devcentral.f5.com/questions/incorrect-load-balancing-when-disabling-oneconnect
- Ben_Lamb_227759Thanks :) I'll give it a go and report back.
- Ben_Lamb_227759This fixed it, thanks!