Crossroads is a service independent, open source load balance and fail-over utility for Linux and TCP based services. It can be used for HTTP, HTTPS, SSH, SMTP and DNS etc. It is also a multi-threaded utility which consumes only one memory space which leads to increase the performance when balancing load.
Let’s have a look at how XR works. We can locate XR between network clients and a nest of servers which dispatches client requests to the servers balancing the load.
If a server is down, XR forwards next client request to the next server in line, so client feels no down time. Have a look at the below diagram to understand what kind of a situation we are going to handle with XR.
