Help in creating DataCenter Persistance with iRule

Fairly new to iRule so looking for some help on an idea.

 

 

www.companya.com is a WideIP on a 3dns server that resolves to addresses 10.0.0.1 or 11.0.0.1. Each address goes to a different DataCenter (we'll call them 1 and 2). I don't care which Datacenter the client lands on, but once there I want them to stick.

 

 

Once connected to a DC, I thought I could do a redirect to a DNS name that only resided on that paticular DC. For example, connecting to DC1, I would redirect to www1.companya.com. The DNS address of www1.companya.com would always be in DC1. DC2 would redirect to www2.companya.com which only resided on DC2.

 

 

I don't want anyone to directly bookmark the www1 or www2 site. I still want all initial traffic to be balanced by 3dns (in case one DC is unavailable.

 

 

On the initial VIP www.companya.com, I want to set cookie values in an iRule then re-direct to www1companya.com. The second VIP iRule (www1.companya.com) will check for these set cookie values. If they values are present let the client through to the site, If not re-direct back to www.companya.com to be loadbalanced to a DC. I think that this will keep users from bypassing the 3dns. Again the 3dns needs to pick the DC, then iRules need to stick the user to the DC.

 

 

Here's what I have so far. Please add any comments.

 

 

iRule set for www.companya.com VIP

 

when CLIENT_ACCEPTED {

 

set ckname www1

 

set ckvalue [IP::client_addr]

 

set ckdomain companya.com

 

set cookie [format "%s=%s; path=/; domain=%s" $ckname $ckvalue $ckdomain]

 

}

 

when HTTP_RESPONSE {

 

HTTP::respond 302 Location "https://www1.companya.com" "Set-Cookie" $cookie

 

}

 

 

 

iRule set for www1.companya.com VIP

 

 

when CLIENT_ACCEPTED {

 

set ckname www1

 

set ckvalue [IP::client_addr]

 

set ckdomain companya.com

 

}

 

when HTTP_REQUEST {

 

if {[HTTP::cookie exists $ckname]} {

 

pool UITShared

 

}

 

else {

 

HTTP::redirect "https://www.companya.com"

 

}

 

}

 

 

Suppose this will really work? I have not tried it yet. Ideas?

 

 

Thanks for all your help!