How to load balance sockets using ingress nginx - nginx

Question

In kubernetes I have a deployment of 3 pods in charge of the sockets.
I wish to load balance the traffic between the pods of the deployment. To do it, I'm using the NGINX Ingress controller installed via Helm using the chart stable/nginx-ingress.
The problem is that the clients always connect to the same pod. There is no balancing.
To test the load balancing, I'm using sevaral phones using the data (2-6 phones). Each of them opening a socket connection.
I have 2 ingress rules. For the sockets I'm using:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-socket-service
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/websocket-services: "node-socket-service"
nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
nginx.ingress.kubernetes.io/upstream-hash-by: "$host"
spec:
tls:
- hosts:
- example.com
rules:
- host: example.com
http:
paths:
- path: /socket.io/
backend:
servicePort: 4000
serviceName: node-socket-service
Service:
apiVersion: v1
kind: Service
metadata:
name: node-socket-service
spec:
type: ClusterIP
selector:
component: node-socket
ports:
- port: 4000
targetPort: 4000
I tried to change the value of upstream-hash-by with : $binary_remote_addr $remote_addr $host ewma $request_uri, unsuccessful...
I'm wondering if the way that I'm doing my test is good. May be the load balancing is working well but it needs to have more clients.

Answer 1

I am assuming you are using the following architecture to reach your pod:
Ingress controller ---> kubernetes service ---> kubernetes deployment (POD)
If this is the case, then you are using load balancing with a statistical round robin policy already. For which I would conclude that your deployment only has one replica. Check the amount of replicas by running kubectl describe deployment $YOUR_DEPLOYMENT. Increase the amount of replicas by running kubectl scale deployment --replicas=5.
In case you are using a different architecture I would need to check it in order to verify why load balancing is not working. Most likely you are not using a Deployment bud a Pod to deploy your container.

Answer 2

Try nginx.ingress.kubernetes.io/upstream-hash-by: $arg_token instead of $host