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Absarkhan_15403's avatar
Absarkhan_15403
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Aug 04, 2014

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? If yes how to use the variable in order to define it?   Many Thanks in advance ...
application delivery
devops
iRules
  • nitass_89166's avatar
    nitass_89166
    Aug 04, 2014

    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.

     

nitass_89166's avatar
nitass_89166
Icon for Noctilucent rankNoctilucent
Aug 04, 2014

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.

 

  • Absarkhan_15403's avatar
    Absarkhan_15403
    Icon for Nimbostratus rankNimbostratus
    Aug 04, 2014
    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.
  • Absarkhan_15403's avatar
    Absarkhan_15403
    Icon for Nimbostratus rankNimbostratus
    Aug 04, 2014
    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 "/" } }