Sticky learn and Wildfly

[uqpik]

Wildlfy sends a cookie for session affinity. Depending on the primary session owner the value of the cookie is modified to switch to another server.
How can a i respect this in the ingress configuration, normally i would use "sticky learn", but this seems not to work for the ingress controller.
Like HAProxys "preserve" keyword for cookie would be desirable.

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[rikatz]

https://kubernetes.github.io/ingress-nginx/examples/affinity/cookie/ ?

[uqpik]

https://kubernetes.github.io/ingress-nginx/examples/affinity/cookie/ ?
There is no setting that uses the cookie value set by the application server, it always uses its own cookie (and value). "sticky learn" is not supportetd by nginx ingress.
There should be the possibility to put the cookie send from the application server into a table to use it for routing.

[rikatz]

I see. Sorry, we dont have a short or midterm to implement or accept this feature, it would demand changing lua code and accepting that the backend will tell ingress to which backend it should route, which IMO is not something we should be doing.

[uqpik]

For session caching (replication), a WildFly (and JBoss EAP) cluster has a primary session owner, that is reassigned when the original server is no longer available. For optimal performance, subsequent requests needs to be forwarded to this pod.
So, as the cluster decides which pod to assign, ingress-nginx should be aware of this.

This is indicated using an "affinity" cookie. Where the cookie value is set to the name of the desired server. And changes, when the primary session owner changes.