Triggering an action based on TCP Connections

Is it possible to trigger an action on the base of how many tcp connection a specific VIP has under a http request?

what action do you want?

you can count number of current tcp connections to virtual server using table sessiondb (table irule command) and take an action when the number reaches threshold.

Is it possible to trigger an action on the base of how many tcp connection a specific VIP has under a http request?

what action do you want?

you can count number of current tcp connections to virtual server using table sessiondb (table irule command) and take an action when the number reaches threshold.

Hi Nitass,

I am trying to run below iRule to display a waiting room page when a certain threshold is reached. Currently the threshold is "number of sessions", however I think it is more logical to track the "number to TCP connections" instead.

Can the sessions be replaced with connectionswith the way you are prescribing?

Many Thanks for your help.

when HTTP_REQUEST priority 1 {
set static::maxActiveClients "[class search -all -value datagroup_selfridges_waitingroom starts_with "max_active_clients"]"
set subtableName "sessionLimit"
set sessionCookieName "[class search -all -value datagroup_selfridges_waitingroom starts_with "session_cookie_prefix"]"
set holdingPage "[class search -all -value datagroup_selfridges_waitingroom starts_with "holding_page_url"]"
set static::sessionTimeout "[class search -all -value datagroup_selfridges_waitingroom starts_with "session_timeout"]"
set need_cookie 0
if {[HTTP::cookie exists $sessionCookieName]} { 
set client_id [HTTP::cookie $sessionCookieName]
set sessiondata [table lookup -subtable $subtableName $client_id]
if { $sessiondata != "" } {
 log local0. "Valid session $client_id - continuing"
return 
} 
}
 log local0. "No session. Checking for free slot (Max $static::maxActiveClients)"
set sessionCount [table keys -subtable $subtableName -count]
 log local0. "No session. Checking for free slot (Current $sessionCount)"
if {$sessionCount < $static::maxActiveClients} {
set need_cookie 1
set client_id [format "%08d" [expr { int(1000000000 * rand()) }]] 
set sessionValue [IP::client_addr]
table add -subtable $subtableName $client_id $sessionValue $static::sessionTimeout
log local0. "New Session ($client_id) added value $sessionValue Timeout $static::sessionTimeout"
} else {
HTTP::redirect $holdingPage
}
}
when HTTP_RESPONSE priority 1 {
if {$need_cookie == 1} {
HTTP::cookie insert name $sessionCookieName value $client_id path "/"
}
}

Can the sessions be replaced with connectionswith the way you are prescribing?

if you want to track tcp connection, you may increase the counter in CLIENT_ACCEPTED and decrease it in CLIENT_CLOSED.

Can you kindly elaborate a little regarding tracking tcp connections in a table?

you are already using table (table irule command) to track number of user sessions.

what i mean is something similar to this.

iRule::ology; Connection Limiting Take 2 by Colin Walker