7

I have multiple instances of MongoDB deployed inside my Kubernetes cluster through Helm packages. They are running as a service, in NodePort.

How do I connect to those MongoDB instances through UI tools like MongoDB Compass and RoboMongo from outside the cluster?

Peter Mortensen
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Shruthi Bhaskar
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4 Answers4

12

You can use kubectl port-forward to connect to MongoDB from outside the cluster.

Run kubectl port-forward << name of a mongodb pod >> --namespace << mongodb namespace >> 27018:27018.
Now point your UI tool to localhost:27018 and kubectl will forward all connections to the pod inside the cluster.

Starting with Kubernetes 1.10+ you can also use this syntax to connect to a service (you don't have to find a pod name first):
kubectl port-forward svc/<< mongodb service name >> 27018:27018 --namespace << mongodb namespace>>

Oliver
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1

If it is not your production database you can expose it through a NodePort service:

# find mongo pod name
kubectl get pods
kubectl expose pod <<pod name>> --type=NodePort
# find new mongo service
kubectl get services

Last command will output something like

mongodb-0   10.0.0.45    <nodes>       27017:32151/TCP   30s

Now you can access your mongo instance with mongo <<node-ip>>:32151

Andrey Serebryanskiy
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1

Fetch the service associated with MongoDB:

kubectl get services -n <namespace>

Port forward using:

kubectl port-forward service/<service_name> -n <namespace> 27018:27017

Open Robomongo on localhost:27018.

Peter Mortensen
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Adi Sivasankaran
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0

If not resolved, expose your mongo workload as a load balancer and use the IP address provided by the service. Copy the LB IP address and use the same in the robo3T. If it requires authentication, check my YAML file below:

apiVersion: apps/v1
kind: Deployment
metadata:
    name: mongodb
    labels:
        app: mongodb
spec:
    replicas: 1
    selector:
        matchLabels:
            app: mongodb
    template:
        metadata:
            labels:
                app: mongodb
        spec:
            containers:
                - name: mongodb
                  image: mongo
                  volumeMounts:
                      - name: data
                        mountPath: "/data/db"
                        subPath: "mongodb_data"
                  ports:
                      - containerPort: 27017
                        protocol: TCP
                  env:
                      - name: MONGO_INITDB_ROOT_USERNAME
                        value: xxxx
                      - name: MONGO_INITDB_ROOT_PASSWORD
                        value: xxxx
            imagePullSecrets:
                - name: xxxx
            volumes:
                - name: data
                  persistentVolumeClaim:
                      claimName: xxx

Set the same values in the authentication tab in ROBO3T

Note: I haven't mentioned the service section in the YAML since I directly exposed as an LB in the GCP UI itself.

Peter Mortensen
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Thrinadh Kumpatla
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