CODEWITHSUNDEEP
mongodbkuberneteskubernetes-ingressmongo-express
keemahs
keemahs

Reputation: 998

cannot connect to mongo-express behind ingress k8s

I am trying to create the following:

  1. Deployment for mongo
  2. Deployment for mongo-express
  3. ClusterIp for mongo
  4. ClusterIp for mongo-express
  5. An Ingress Service to route request to mongo-express

I want to be able to go to xyz.com/admin/auth-db-gui and see the mongo-express gui.

I am running this on Linux minikube.

When going to xyz.com/admin/auth-db-gui, I get 503 Service Temporarily Unavailable, however when executing kubectl get pods, I can see 2 pods running.

I will setup the mapping for xyz.com in /etc/hosts manually as this is for only dev purpose

db.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-db-deployment
spec:
  selector:
    matchLabels:
      app: auth-db
  template:
    metadata:
      labels:
        app: auth-db
    spec:
      containers:
        - name: auth-db
          image: mongo
---
apiVersion: v1
kind: Service
metadata:
  name: auth-db-service
spec:
  selector:
    app: auth-db
  ports:
    - name: auth-db
      protocol: TCP
      port: 27017
      targetPort: 27017

db-gui

apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-db-gui-deployment
spec:
  selector:
    matchLabels:
      app: auth-db-gui
  template:
    metadata:
      labels:
        app: auth-db-gui
    spec:
      containers:
        - name: auth-db-gui
          image: mongo-express
          env:
            - name: ME_CONFIG_MONGODB_SERVER
              value: auth-db-service
---
apiVersion: v1
kind: Service
metadata:
  name: auth-db-gui-service
spec:
  selector:
    app: auth-db-gui
  ports:
    - name: auth-db-gui
      protocol: TCP
      port: 27017
      targetPort: 27017

ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: xyz-ingress
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/use-regex: "true"
spec:
  rules:
    - host: xyz.com
      http:
        paths:
          - path: /admin/auth-db-gui
            backend:
              serviceName: auth-db-gui-service
              servicePort: 8081

Sorry if there is an obvious mistake above.

Upvotes: 0

Views: 846

Answers (1)

acid_fuji
acid_fuji

Reputation: 6853

I notice that in some cases 503 means that ports on configured correctly.

I've tested your ingress, along with the service and the deployment and after correcting the mistake with port in the ingress object it works great:

curl -H "Host:  xyz.com"  "192.168.49.2/admin/auth-db-gui"   
{
  "path": "/admin/auth-db-gui",
  "headers": {
    "host": "xyz.com",
    "x-request-id": "ff272df6d729af6c1fb4d5f510de88f4",
    "x-real-ip": "192.168.49.1",
    "x-forwarded-for": "192.168.49.1",
    "x-forwarded-host": "xyz.com",
    "x-forwarded-port": "80",
    "x-forwarded-proto": "http",
    "x-scheme": "http",
    "user-agent": "curl/7.52.1",
    "accept": "*/*"
  },
  "method": "GET",
  "body": "",
  "fresh": false,
  "hostname": "xyz.com",
  "ip": "192.168.49.1",
  "os": {
    "hostname": "auth-db-gui-deployment-555c77cf75-fjbf2"

For testing purposes I highly recommend mendhak/http-https-echo. I swapped the image in your deployed and fix the port. You can test the ingress yourself with the below yaml files:

#ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: xyz-ingress
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/use-regex: "true"
spec:
  rules:
    - host: xyz.com
      http:
        paths:
          - path: /admin/auth-db-gui
            backend:
              serviceName: auth-db-gui-service
              servicePort: 27017

Notice the how the port are being set. The servicePort in ingress corresponds to service port which is 27017. I changed the target port of the service since echo-server works on 80

#sevice.yaml

apiVersion: v1
kind: Service
metadata:
  name: auth-db-gui-service
spec:
  selector:
    app: auth-db-gui
  ports:
    - name: auth-db-gui
      protocol: TCP
      port: 27017
      targetPort: 80

#deployment.yaml
 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-db-gui-deployment
spec:
  selector:
    matchLabels:
      app: auth-db-gui
  template:
    metadata:
      labels:
        app: auth-db-gui
    spec:
      containers:
        - name: auth-db-gui
          image: mendhak/http-https-echo

Please have a look at the docs about services for more examples.

Upvotes: 1

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