Setup mongo using Kubernetes community operator in local dev box

Setting up mongo in local dev box is little tricky. The official documents are good place to start. But I faced issues with getting them all working in a local setup for development purpose.

Setup mongo operator

helm repo add mongodb https://mongodb.github.io/helm-charts
helm install community-operator mongodb/community-operatorSetup mongo database resource

• Let’s setup mongo database resource. Save the below file as mongo.yaml. Later we will revisit this area and move this into our helm-charts repository.

---
apiVersion: mongodbcommunity.mongodb.com/v1
kind: MongoDBCommunity
metadata:
  name: mongo
spec:
  members: 1
  type: ReplicaSet
  version: "4.2.6"
  security:
    authentication:
      modes: ["SCRAM"]
  users:
    - name: my-user
      db: admin
      passwordSecretRef: # a reference to the secret that will be used to generate the user's password
        name: my-user-password
      roles:
        - name: clusterAdmin
          db: admin
        - name: userAdminAnyDatabase
          db: admin
        - name: readWriteAnyDatabase
          db: admin
      scramCredentialsSecretName: my-scram
  additionalMongodConfig:
    storage.wiredTiger.engineConfig.journalCompressor: zlib
  statefulSet:
    spec:
      serviceName: mongo
      template:
        spec:
          containers:
            - name: mongodb
              image: mongo
              env:
                - name: MONGO_INITDB_DATABASE
                  value: platformdb
                - name: MONGO_INITDB_ROOT_USERNAME
                  value: admin
                - name: MONGO_INITDB_ROOT_PASSWORD
                  value: password
            - name: mongodb-agent
              readinessProbe:
                exec:
                  command:
                    - ls
                enabled: false
                failureThreshold: 50
                initialDelaySeconds: 300
                periodSeconds: 300
                timeoutSeconds: 300
# the user credentials will be generated from this secret
# once the credentials are generated, this secret is no longer required
---
apiVersion: v1
kind: Secret
metadata:
  name: my-user-password
type: Opaque
stringData:
  password: password

• Run following command

kubectl apply -f mongo.yaml
# operator will pick this kind of resource 
# and setup the all the mongo requirements

Connecting desktop mongo clients with mongo

• we need to port forward mongo

kubectl port-forward service/mongo 27017:27017

• connection URL based on above flow:

mongodb://admin:password@localhost:27017/?authSource=admin&authMechanism=SCRAM-SHA-256&directConnection=true

• We are all set to use the mongo