I have a VueJS application running in a Docker image in kubernetes. Once multiple replicas/pods exist, clients are unable to load the application - many (but not all) calls to load files return 404.

I think this is because they are being sent to a different Pod than the Pod that originally serviced the request.

how to solve this problem?

This is my setup:

• VueJS applications (node.js-Server) run from Docker images in kubernetes.
• Services and endpoints in kubernetes above.
• The nginx ingress into Kubernetes serves as the next outward layer (see below).
• haproxy firewall to route myapp.mydomain.com/ to the ingress on k8s.

This is an example call that returns 404: Get https://myapp.mydomain.com/js/chunk-d18c0136.7a3f0664.js

This is my service specification:

apiVersion: v1
kind: Service
metadata:
  name: ${CI_PROJECT_NAME}-${CI_BUILD_REF_SLUG_SHORT}
  labels:
    app: ${CI_ENVIRONMENT_SLUG}
spec:
  ports:
    - port: 80
      targetPort: 8080
      protocol: TCP
      name: ${CI_PROJECT_NAME}-${CI_BUILD_REF_SLUG}
  selector:
    app: ${CI_ENVIRONMENT_SLUG}

This is my nginx entry specification:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ${CI_PROJECT_NAME}-${CI_BUILD_REF_SLUG_SHORT}
  labels:
    app: ${CI_ENVIRONMENT_SLUG}
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/affinity: "cookie"
    nginx.ingress.kubernetes.io/proxy-connect-timeout: "30"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
spec:
  defaultBackend:
    service:
      name: ${CI_PROJECT_NAME}-${CI_BUILD_REF_SLUG_SHORT}
      port:
        number: 80
  rules:
    - host: ${CI_APPLICATION_HOST}
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: ${CI_PROJECT_NAME}-${CI_BUILD_REF_SLUG_SHORT}
                port:
                  number: 80

As a workaround, we configure the firewall to communicate directly with only one Pod, or only run one replica.

Setting the session sticky "cookie" on the nginx portal does not work.