irule not being executed

Unfortunately I cannot help you with pools (it looks good by itself). Maybe a little help from another side: log data during development phase, use e.g.

log local0.err "This is the host uri: [HTTP::uri] or ${my_variable}"

you could see the log output in the admin console, but fastest way is to log into the console nad tail

tail -F /var/log/ltm

still - I assume your issue may be in the evaluating (comparing) the values, so no condition is met and default pool is used.

Good luck g.

Thanks Gabriel. I will try the log. I did suspect it might be an issue that the values arent being met so hopefully I will see something in the log.

Hi, I added the log local.err to the irule and am getting the following output when I browse to : https://xxx.xxx.xxx/xxx

Jul 24 10:43:33 lkds-bigip-1 err tmm3[11524]: Rule /Common/PROJ-SS-Selection : This is the host uri: /xxx

From this it doesnt appear to meet the condition. It is seeing /xxx rather than xxx.xxx.xxx/xxx. I have changed the rule to if {$hostname contains "/xxx" } { pool POOL-XXX } but it still doesnt work. I'm not very familiar with irule logging so I'm not really sure what that actually means? Any help would be much appreciated.

Thanks in advance.

The biggest issue I see is the conditional matching. The [HTTP::host] command returns the Host header value in the request URL (ex. www.domain.com), while the [HTTP::uri] command returns the URI portion of the URL (ex. /xxx). Your evaluation is trying to match the host name to both the host and the URI, which would never work. An example workaround might look like this:

when HTTP_REQUEST {
    if { ( [string tolower [HTTP::host]] equals "xxx.xxx.xxx" ) and ( [string tolower [HTTP::uri]] starts_with "/xxx" ) } {
        pool POOL-XXX
    } elseif { ( [string tolower [HTTP::host]] equals "yyy.yyy.yyy" ) and ( [string tolower [HTTP::uri]] starts_with "/yyy" ) } {
        pool POOL-YYY
    }
}

The above should work, but it also does present a problem. What if the host is xxx.xxx.xxx and the URI is not /xxx? You should attempt to account for all of the possible ways that a client can make a request. Example:

when HTTP_REQUEST {
    switch [string tolower [HTTP::host]] {
        "xxx.xxx.xxx" {
            if { [string tolower [HTTP::uri]] starts_with "/xxx" } {
                pool POOL-XXX
            } else {
                 ...what to do if the URI isn't /xxx?
            }
        }
        "yyy.yyy.yyy" {
            if { [string tolower [HTTP::uri]] starts_with "/yyy" } {
                pool POOL-YYY
            } else {
                 ...what to do if the URI isn't /yyy?
            }
        }
        default {
             ...what to do if the Host is neither of the above?
             drop?
        }
    }
}

Hi, Just to update. I'm only new to irules and irule logging so I'm learning as I go so forgive me for above misunderstanding. I think I misunderstood what a URI actually meant. I have since modified the irule to check the requestURI rather than the hostname and it now works. I added in a log to check what the actual hostname was. It was xxx.xxx.xxx therefore I deduced it wasnt meeting the condition so changed it to requestURI. It is now working as expected. Thanks so much Gabriel V. You pointed me in the right direction.

Hi Kevin,

Only seeing your message after I posted above. I actually changed it to

if {requestURI contains '/xxx' } {pool POOL-xxx }

and it now appears to work. The hostname would always be the same but the URI could be different.

Thanks for your response.