help me write a irule about persist with uri

A couple of questions: 1) What is the protocol being used, and what application is it? 2) What's the reason for needing to re-balance back to the first server if it comes back?

Hi, @MiLK_MaN 1.the protocol is HTTP,and the application is their development. The staff visit the application with HTTP,and the URI include their own ID number (the string is "loginid=xxxxxxxx"). 2.their Ngix can satisfy this re-balance back to the first server if it comes back, so the leader also require f5 to satisfy it. thanks

In the pool configuration, set "Action on Service Down" to "reselect", which will cause the BIG-IP to do another pool selection against available members.

 

I'm going to advise against having the traffic go back to the original server just for the sake of it. Sure, technically this can be achieved, but it's actually not that easy and requires you to first check if pool member A is active, and if so, unbind the connection to pool member B and then re-bind with pool member A. There's no real easy way to track that the pool member that was originally selected was member A without creating a table entry, and then checking it on each request.... all in all its technically possible but horribly inefficient and not really worth it.