Nginx container to load-balance websocket servers in Kubernetes

‼️ Note: At this point, I suggest checking the official ingress-nginx#websockets as well.

This container is designed to be run in a pod in Kubernetes to proxy websocket requests to a socket server. You can provide following environment variables to customize it.

# set env var to dns name of the socket server
SOCKET_SERVER=socket-service

This is supposed to work with the service exposed via AWS Elastic Loadbalancer. Make sure you enable proxy protocol in your ELB.

You should run this as a Kubernetes service. Remember to set sessionAffinity: ClientIP to both, this nginx and upstream socket service.

Example manifest:

apiVersion: v1
kind: Service
metadata:
  name: nginx-socket
  labels:
    run: nginx-socket
spec:
  type: NodePort
  ports:
  - port: 80
    protocol: TCP
    nodePort: 31110
  selector:
    run: nginx-socket
  sessionAffinity: ClientIP
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-socket
spec:
  replicas: 3
  template:
    metadata:
      labels:
        run: nginx-socket
    spec:
      containers:
      - name: nginx-socket
        image: apsops/kube-nginx-websocket:v0.3
        ports:
        - containerPort: 8080
        env:
          - name: SOCKET_SERVER
            value: socket-service

I plan to make this more modular and reliable.

Feel free to open issues and pull requests for bug fixes or features.

This project is licensed under the MIT License. Refer LICENSE for details.