sticky sessions kubernetes service with apache and ingress - kubernetes

Question

I have an k8s Apache server which uses mod_jk to connect to different kubernetes services. mod_jk is sort of dummy here as workers are having k8s service URL. I am now trying to achieve sticky sessions based on JESSIONID in the cookie. I have traefik ingress controller which directs all requests to k8s Apache service. The requests is terminated at ingress level for TLS. What is the best way to achieve sticky session ?
I tried enabling sessionAffinity: ClientIP, but the client IP is always same. It is the ingress controller.

Answer 1

In the Kubernetes ingress object in the annotations label you have to define, which kind of Ingress will you use, so in your case: Traefik ingress controller. Please note, that the sticky session in Traefik is defined in the Service object with the annotation. Instead of a random cookie name, we define it as JSESSIONID.
Ingress object definition:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: traefik
labels:
app: session-affinity
name: session-affinity
spec:
tls:
- host: <address>
secretName:
rules:
- host: <address>
http:
paths:
- path: /
backend:
serviceName: session-affinity
servicePort: 8080
Service object definition:
apiVersion: v1
kind: Service
metadata:
name: session-affinity
labels:
app: session-affinity
annotations:
traefik.ingress.kubernetes.io/affinity: "true"
traefik.ingress.kubernetes.io/session-cookie-name: "JSESSIONID"
spec:
type: NodePort
ports:
- port: 8080
targetPort: 8080
You can find more information in documentation.