Forum Discussion

Nimbostratus

Oct 09, 2015

iRule (round robin) modification - ignore if the node in pool is down!

I have an irule to divert traffic to two servers, and it is working as round robin, and want to get some help to modify this rule so if one node is down the traffic flows to another... I am hoping th...

Nacreous

Oct 09, 2015

You'll need to create a pool, pl_redirect_pool with an HTTP monitor and Server1 and Server2 as members. Then try this rule (note you need to hardcode the IPs of Servers 1 and Server 2 in here also);-

when RULE_INIT { 

   set ::whichone 0 
   set ::servers [list "x.x.x.x" "y.y.y.y"]
    Unfortunately have to hardcode the server IPs here
   set ::redirs  [list "http://Server1/xyz" "http://Server2/xyz"]

} 
when HTTP_REQUEST { 

     if  { [LB::status pool pl_redirect_pool member [lindex $servers $::whichone] 80] eq "up" } {}
        HTTP::redirect [lindex $::redirs $::whichone]
     else {
        HTTP::redirect [lindex $::redirs [expr ! $::whichone]] 
     }

      set ::whichone [expr ! $::whichone] }
}