Kubernetes ingress returning a 502 bad gateway

Question

So, I am trying to deploy a personal website app and expose it to a local domain (for now) but I am always getting a 502 Bad Gateway from my nginx-ingress-controller . So, for such task I have built 3 files: deployment.yaml , service.yaml and ingress.yaml :

apiVersion: apps/v1
kind: Deployment
metadata:
  name: website-deployment
  labels:
    app: website
spec:
  replicas: 1
  selector:
    matchLabels:
      app: website
  template:
    metadata:
      labels:
        app: website
    spec:
      containers:
      - name: website
        image: jotinha2014/private
        ports:
        - containerPort: 55004

    apiVersion: v1
    kind: Service
    metadata:
      name: website-service
    spec:
      selector:
        app: website
      ports:
        - protocol: TCP
          port: 80
          targetPort: 55004
      type: ClusterIP

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: website-ingress
  namespace: default
  annotations:
    nginx.ingress.kubernetes.io/service-upstream: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: rabanadas.eu
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: website-service
            port:
              number: 80

Here are some logs from my nginx-ingress-controller:

2021/01/03 01:13:31 [error] 1371#1371: *34677 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.64.1, server: rabanadas.eu, request: "GET / HTTP/1.1", upstream: "http://10.106.8.10:80/", host: "rabanadas.eu"
2021/01/03 01:13:31 [error] 1371#1371: *34677 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.64.1, server: rabanadas.eu, request: "GET / HTTP/1.1", upstream: "http://10.106.8.10:80/", host: "rabanadas.eu"
2021/01/03 01:13:31 [error] 1371#1371: *34677 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.64.1, server: rabanadas.eu, request: "GET / HTTP/1.1", upstream: "http://10.106.8.10:80/", host: "rabanadas.eu"
192.168.64.1 - - [03/Jan/2021:01:13:31 +0000] "GET / HTTP/1.1" 502 552 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36" 474 0.000 [default-website-service-80] [] 10.106.8.10:80, 10.106.8.10:80, 10.106.8.10:80 0, 0, 0 0.000, 0.000, 0.000 502, 502, 502 dff7944bbbc17be35584fee465d047d2
W0103 01:15:52.298006       8 warnings.go:67] networking.k8s.io/v1beta1 Ingress is deprecated in v1.19+, unavailable in v1.22+; use networking.k8s.io/v1 Ingress

Right now I am using minikube and, as such, my nginx-ingress-controller was configure just by adding it as addon . I suspect that the problem is with my ingress configuration because I've already port-forwarded the pod deployed and the website is showing as it is supposed on the right port.

As requested, here are my website pod details:

Name:         website-deployment-69f57fc45-l4th9
Namespace:    default
Priority:     0
Node:         minikube/192.168.64.5
Start Time:   Sun, 03 Jan 2021 00:53:16 +0000
Labels:       app=website
              pod-template-hash=69f57fc45
Annotations:  <none>
Status:       Running
IP:           172.17.0.2
IPs:
  IP:           172.17.0.2
Controlled By:  ReplicaSet/website-deployment-69f57fc45
Containers:
  website:
    Container ID:   docker://eae48617da80f3ac4832695535432581746d925fc497066a5fd8a707b3020a88
    Image:          jotinha2014/private
    Image ID:       docker-pullable://jotinha2014/private@sha256:0a9573429315745eae0a33339021c82db2e92e0ba35ca652aa20482af31f1219
    Port:           55004/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Sun, 03 Jan 2021 00:53:18 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-j8pzx (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-j8pzx:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-j8pzx
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:          <none>

Thanks in advance fo any help.

Answer 1

As per the comments; The targetPort in the Service manifest, and the containerPort in the Deployment manifest need to match the port that the server inside the container is listening on.

As nginx by default listens on port 80, these should be changed to port 80. Otherwise, the server in the container should be changed to listen on a different port. For nginx this can be done with an nginx.conf file, or by setting an NGINX_PORT environment variable. See https://hub.docker.com/_/nginx for details.

Usually, you'll run one container per pod, so changing the port to something other than 80 is rarely needed.