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Gambler_168259's avatar
Gambler_168259
Icon for Nimbostratus rankNimbostratus
Nov 25, 2014

More than one Pools in the same iRule statement Line

I have a scenario, we have created an iRule entry in the iRule section named (New-Proxy1). The situation is that we have four different pools with different ports and i want to call all the four pools in the iRule statement one by one i.e. Pool1, then Pool2, Pool3, then Pool4 which means if all pools have 4 members each then the request should be load balanced round robin in the first pool and the 5th request should land in the 2nd pool 9th request in the 3rd pool and 13th request in the fourth pool.

 

Is it possible??? As i am trying to avoid to create VS for http/https separately instead i am looking to create a simple iRule statement to do the Load balancing among all the pools sequentially.

 

Kindly Help or assist or call me at +92-03226118795 or Email me at asif.taj@techaccesspak.com

 

application delivery
availability
BIG-IP Access Policy Manager (APM)
deployment
devops
iRules
LTM
security

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  • Gambler_168259's avatar
    Gambler_168259
    Icon for Nimbostratus rankNimbostratus
    Nov 25, 2014
    when HTTP_REQUEST { switch -glob [HTTP::uri] { "/InCrmLive*" { pool Tibco-LB-Group31 HTTP::uri [string range [HTTP::uri] [string first "/" [HTTP::uri] 1] end] } } }
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Nov 25, 2014

    this may not be optimized. anyway, what it does is to combine all pool members and send traffic to them in round robin fashion.

    by the way, cmp is disabled (cmp-enabled no) to make test easier.

     configuration

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    cmp-enabled no
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 3
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
 return next index
proc getnext { cur max } {
  set t [expr { $cur + 1}]
  if { $t >= $max } {
    return 0
  } else {
    return $t
  }
}
when RULE_INIT {
   pool names
  set static::pools "foo1 foo2"

   create list of pool members
  set static::list ""
  foreach static::apool $static::pools {
    set static::list [concat $static::list [eval "members -list $static::apool"]]
  }
   total number of pool members
  set static::len [llength $static::list]

   pool member counter
  set static::c 0
}
when HTTP_REQUEST {
   flag to prevent indefinite loop
  set loop 0

   pickup online (up) pool member
   to simplify coding, monitor is done on node level instead of pool/pool member level
  while { ([LB::status node [lindex [lindex $static::list $static::c] 0]] ne "up") and ($loop <= 1) } {
    set static::c [call getnext $static::c $static::len]
    if { $static::c == 0 } { incr loop }
  }

   no pool member is available, so return 500
  if { $loop > 1 } {
    HTTP::respond 500
    return
  }

   pool member is available, so send to pool member
  node [lindex [lindex $static::list $static::c] 0] [lindex [lindex $static::list $static::c] 1]

   increase counter
  set static::c [call getnext $static::c $static::len]
}
when HTTP_RESPONSE {
   log for verification
  log local0. "server [IP::server_addr]:[TCP::server_port]"
}
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo1
ltm pool foo1 {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
        200.200.200.111:80 {
            address 200.200.200.111
        }
    }
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo2
ltm pool foo2 {
    members {
        172.28.24.1:80 {
            address 172.28.24.1
        }
    }
}

 test

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.111:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.101:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 172.28.24.1:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.111:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.101:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 172.28.24.1:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.111:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.101:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 172.28.24.1:80
Nov 25 23:56:37 ve11a info tmm[14890]: Rule /Common/qux : server 200.200.200.111:80