[FIXED] Local Mongo DB Container Access with Kubernetes Service Endpoint in K3s is not working

Issue

Earlier I used earlier kubeadm to create an endpoint from my local MongoDB which is running in a Docker container, now we have switched from kubeadm to k3s because it is a lot of easier to use. Now we are not able to use the MongoDB endpoints, it is reachable inside the Kubernetes cluster. I will share the necessary information for you. Would be glad if anybody can help me.

1. This is the Mongo DB container which is running inside usual Docker:

2. Now I would like use it in my Kubernetes cluster, before I did a check if I am able to access inside the port 27019 and it seems to be fine.

user@shell:~$ curl {address-of-the-VM}:27019
It looks like you are trying to access MongoDB over HTTP on the native driver port.

3. Add next I created the Endpoint and service file

apiVersion: v1
kind: Service
metadata:
  name: mongo
  namespace: dev
spec:
  clusterIP: None
  ports:
  - port: 27019
    targetPort: 27019

apiVersion: v1
kind: Endpoints
metadata:
  name: mongo
  namespace: dev
subsets:
  - addresses:
      - ip: {address-of-the-VM}
    ports:
      - port: 27019
        name: mongo
        

And as next I used them for my environment variable as ConfigMap:

kind: ConfigMap
apiVersion: v1
metadata:
  name: spring-profile
  namespace: dev
data:
  MONGODB_HOSTS: mongo.dev
  MONGODB_PORTS: "27019"
  spring.profiles.active: dev
  stage: dev

And bind it to my pod in deployment:

    containers:
      - name: dev-server
        image: localhost:5000/dev_dev-server 
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
        envFrom:
        - configMapRef:
            name: spring-profile    

Now I am getting this issue, so the database can not find.

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'maintenanceFeature': Unsatisfied dependency expressed through field 'systemSrvc'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'systemDAO': Unsatisfied dependency

As I mentioned earlier in our kubeadm architecture it worked very fine now it is not working. And I checked as well if the MongoDB is in the node of K3s and yes, it is.

Solution

I found the solution, you can use directly the IP Address {address-of-the-VM}:27019.

Answered By - Cosss