I have an ejabberd cluster in AWS that I want to load balance. I initially tried putting an ELB in front of the nodes, but that makes the sessions to be non-sticky. I then enabled proxy protocol on the ELB and introduced an HAProxy node between the ELB and the ejabberd cluster. My assumption / understanding here was that the HAProxy instance would use the TCP proxy and ensure the sessions are sticky on the ejabberd servers.
However, that still does not seem to be happening! Is this even possible in the first place? Introducing the cookie config in the HAProxy.cfg file gives an error that cookies are enabled only for HTTP, so how can I have TCP sessions stay sticky on the server...
Please do help as seem to be lost on ideas here!
ejabberd does not require sticky load balancing. You do not need to implement this. Just use ejabberd cluster with ELB or HAProxy on front, without stickyness.