Deploy MongoDB Community on Kubernetes

 

In this post we will review the step to install MongoDB community version on a kubernetes cluster.

First, we install the MongoDB operator:

helm repo add mongodb https://mongodb.github.io/helm-charts
helm install community-operator mongodb/community-operator

Next, we create a replica.yaml file for the MongoDB custom resources:

---
apiVersion: mongodbcommunity.mongodb.com/v1
kind: MongoDBCommunity
metadata:
  name: example-mongodb
spec:
  members: 1
  type: ReplicaSet
  version: "5.0.16"
  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
      scramCredentialsSecretName: my-scram
  additionalMongodConfig:
    storage.wiredTiger.engineConfig.journalCompressor: zlib

# 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: my-pass

And apply the resources:

kubectl apply -f replica.yaml

Now we can connect to the MongoDB using kubectl:

kubectl exec -it example-mongodb-0 -- mongosh "mongodb+srv://my-user:mongo@example-mongodb-svc.default.svc.cluster.local/admin?ssl=false"