Forum Discussion

ingard's avatar
ingard
Icon for Nimbostratus rankNimbostratus
Jan 25, 2016

irule to log slow and/or tcp profile timed out requests to backend

Hi   I'm trying to identify which requests are causing our backends to stop responding/hang/fail. I was thinking some sort of timer and/or catch the tcp timeout rst maybe? I've been trying to figu...
application delivery
iRules
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Feb 02, 2016

Hi Ingard,

I've added additional error handles to avoid any can't read "debug(xyz)": no such variable errors. In addition I've moved the [after] code to the HTTP_REQUEST_SEND event to not depend on the LB_SELECTED getting triggered.

 

when RULE_INIT {
    set static::timeout 10000  ; msec
}
when HTTP_REQUEST {
    set debug(request_url) "[HTTP::host][HTTP::uri]"
}
when HTTP_REQUEST_SEND {
    set debug(server_addr) "[LB::server addr]"
    set debug(id) [after $static::timeout {
        if { [info exist debug(server_addr)] and [info exist debug(request_url)] } then {
            log local0.warn "$static::timeout msec timeout reached on Node \"$debug(server_addr)\" for \"$debug(request_url)\""
        } elseif { [info exist debug(request_url)] } then {
            log local0.warn "$static::timeout msec timeout reached on Node \"UNKNOWN\" for \"$debug(request_url)\""
        }
    }]
}
when HTTP_RESPONSE {
    if { [info exist debug(id)] } then {
        after cancel $debug(id)
    }
    unset -nocomplain debug
}
when CLIENT_CLOSED {
    if { [info exist debug(server_addr)] and [info exist debug(request_url)] } then {
        log local0.warn "Connection closed without HTTP response on Node \"$debug(server_addr)\" for \"$debug(request_url)\""
    } elseif { [info exist debug(request_url)] } then {
        log local0.warn "Connection closed without HTTP response on Node \"UNKNOWN\" for \"$debug(request_url)\""
    }
}

 

Cheers, Kai