common-nginx-custom-default-backend.yaml

apiVersion: v1

kind: Service
metadata:
  name: custom-default-backend
  namespace: ingress
  labels:
    app: custom-default-backend
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    name: http
  selector:
    app: custom-default-backend

---

apiVersion: v1
kind: ConfigMap
metadata:
  name: custom-default-backend-configmap
  namespace: ingress
  labels:
    app: custom-default-backend
data:
  custom_error_handling.conf: |
    server {
      listen 80 default_server reuseport;

      location / {
        # Handle HTML requests
        return 301 https://developers.italia.it/${http_x_code}.html;
      }

      location /nginx_status {
        allow 127.0.0.1;
        deny all;

        access_log off;
        stub_status on;
      }

      location /healthz {
        return 200;
      }
    }

---

apiVersion: v1
kind: ReplicationController
metadata:
  name: custom-default-backend
  namespace: ingress
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: custom-default-backend
    spec:
      containers:
      - name: custom-default-backend
        image: docker.io/nginx:1.17.3-alpine

        volumeMounts:
          - name: nginx-config
            mountPath: /etc/nginx/conf.d
            readOnly: true

        ports:
        - containerPort: 80

      volumes:
        - name: nginx-config
          configMap:
            name: custom-default-backend-configmap