Forum Discussion
pvaughan
Nimbostratus
Nimbostratuscookie persistance Site affinity Irule help
Hey Guys and gals, need some help with an irule. I have been tasked with the following requirement and need to write an irule to accomplish this task.
We have 2 data centers with a gtm handing out dns and ltms doing the local loadbalaincing. When a client does a write request to the application it will insert a cookie marking the site it came from for example dc1 or dc2. My developers want to make sure if the ldns times out and the gtm sends the client a different site the ltm will see the wrong site in the cookie and send the packets to the correct site. Thanks
hooleylistCirrostratus
Hi,
You can check HTTP requests in the HTTP_REQUEST event for a cookie and value using [HTTP::cookie value $cookie_name]. You can send a redirect to a site specific hostname using 'HTTP::redirect "http://site2.example.com[HTTP::uri]'.
https://devcentral.f5.com/wiki/iRules.http__cookie.ashx
https://devcentral.f5.com/wiki/iRules.http__redirect.ashx
https://devcentral.f5.com/wiki/iRules.http__uri.ashx
Aaron
pvaughangtm is going to resolve the dns request globally so I don't think a redirect will work. I would rather have the ltm proxy the connection and send it to the other ltm. So if the ltm sees the cookie for the wrong site then snat and send the request to the other ltm