Question 116228 in Mongodb Question posted in
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How to connect to mongodb replicaset (k8s) using compass

I installed mongodb as a replicaset with 3 replicas on my k8s cluster using the bitnami helm chart.

So I get these pods:

mongodb-0.mongodb-headless.mongodb.svc.cluster.local:27017
mongodb-1.mongodb-headless.mongodb.svc.cluster.local:27017
mongodb-2.mongodb-headless.mongodb.svc.cluster.local:27017

Now I would like to get access using mongodb compass.

I set a port forward (at 27017 I’m running a local mongodb)

kubectl port-forward svc/mongodb-headless -n mongodb 27018:27017

and tried to connect compass with the uri

mongodb://localhost:27018

But this gives me the error

getaddrinfo ENOTFOUND mongodb-0.mongodb-headless.mongodb.svc.cluster.local

What am I doing wrong to connect to my k8s cluster mongodb using compass?

Update

% kubectl get all -n mongodb

NAME                    READY   STATUS    RESTARTS   AGE
pod/mongodb-0           1/1     Running   0          25h
pod/mongodb-1           1/1     Running   0          25h
pod/mongodb-2           1/1     Running   0          25h
pod/mongodb-arbiter-0   1/1     Running   0          2d14h

NAME                               TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)     AGE
service/mongodb-arbiter-headless   ClusterIP   None         <none>        27017/TCP   2d14h
service/mongodb-headless           ClusterIP   None         <none>        27017/TCP   2d14h

NAME                               READY   AGE
statefulset.apps/mongodb           3/3     2d14h
statefulset.apps/mongodb-arbiter   1/1     2d14h

values.yaml for bitnami helm chart

image:
  registry: docker.io
  repository: bitnami/mongodb
  digest: "sha256:916202d7af766dd88c2fff63bf711162c9d708ac7a3ffccd2aa812e3f03ae209" # tag: 4.4.15
  pullPolicy: IfNotPresent
architecture: replicaset
replicaCount: 2
updateStrategy:
  type: RollingUpdate
containerPorts:
  mongodb: 27017
auth:
  enabled: true
  rootUser: root
  rootPassword: "password"
  usernames: ["user"]
  passwords: ["userpass"]
  databases: ["db"]

service:
  portName: mongodb
  ports:
    mongodb: 27017

persistence:
  enabled: true
  accessModes:
    - ReadWriteOnce
  size: 8Gi

volumePermissions:
  enabled: true

livenessProbe:
  enabled: false
readinessProbe:
  enabled: false
Tags:

4

Answers


  1. 0

    For what I know (and I use), it isn’t possible to use port forwarding to connect mongo replica set with Compass (you can not use a local port twice or more times…)
    To me that because compass use the topology that replica set use. So you need to be compliant of that topology from your client computer.

    So you can expose the mongo pods with Cluster IP, manage your hosts file to match kubernetes nodes.

    And use standard connection string like you are in kubernetes :
    enter image description here

    UPDATE :
    You can configure mongo helm to do cluster https://artifacthub.io/packages/helm/bitnami/mongodb
    enter image description here

    And you hosts file :

    external_IP1 mongodb-0.mongodb-headless.mongodb.svc.cluster.local

    external_IP2 mongodb-1.mongodb-headless.mongodb.svc.cluster.local

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  2. 0

    You can create 3x nodePort services for the task , example exposure for mongodb-0 pod:

    kind: Service 
apiVersion: v1 
metadata:
  name: mongodb-0
spec:
  type: NodePort
  selector:
    statefulset.kubernetes.io/pod-name: mongodb-0
  ports:
    - nodePort: 30117
      port: 27017
      targetPort: 27017
      protocol: TCP

    And you can connect with COMPASS via the k8s worker nodes exposed nodePort’s as follow:

      connect: mongodb://workernode:30117

    assuming that you have created 3x nodePort’s -> 30117,30118,30119 for the three pods and your bitnami helmchart is using statefulset to manage the pods so the pod names are: mongodb-0,1,2

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  3. 0

     Just have recreated your setup. Everything works fine

    $ k create ns mongo-test
namespace/mongo-test created

$ k -n mongo-test create -f mongo-svc-sts.yaml
statefulset.apps/mongo created
service/mongo-headless created

    result

    $ k -n mongo-test get all
NAME          READY   STATUS    RESTARTS   AGE
pod/mongo-0   1/1     Running   0          44s
pod/mongo-1   1/1     Running   0          40s
pod/mongo-2   1/1     Running   0          27s

NAME                     TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)     AGE
service/mongo-headless   ClusterIP   None         <none>        27017/TCP   13m

NAME                     READY   AGE
statefulset.apps/mongo   3/3     45s

    port forward

    $ k -n mongo-test port-forward svc/mongo-headless 27018:27017
Forwarding from 127.0.0.1:27018 -> 27017
Forwarding from [::1]:27018 -> 27017
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018
Handling connection for 27018

    compass
    enter image description here

    mongo-svc-sts.yaml

    apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mongo
spec:
  serviceName: "mongo"
  replicas: 3
  selector:
    matchLabels:
      app.kubernetes.io/name: mongo
      app.kubernetes.io/component: backend
  template:
    metadata:
      labels:
        app.kubernetes.io/name: mongo
        app.kubernetes.io/component: backend
    spec:
      tolerations:
        - operator: Exists
      containers:
      - name: mongo
        image: mongo:latest
        args:
          - --bind_ip
          - 0.0.0.0
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 27017
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: mongo
    service: logging
  name: mongo-headless
spec:
  type: ClusterIP
  clusterIP: None
  ports:
  - port: 27017
  selector:
    app.kubernetes.io/name: mongo
    app.kubernetes.io/component: backend

    to be able to help you pls use that YAMLs and post the outputs. If it does not work probably you should debug your k8s installation

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  4. 0

    It’s work with port forward and compass with some configuration in compass, using advence options with Direct Connection :
    enter image description here
    And don’t add replicat set option.

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