Installing MongoDB in Kubernetes

The most straight forward way installing MongoDB in Kubernetes is to use helm. But make sure the nfs provisioner is already deployed in kubernetes. You can refer to Kubernetes: Dynamic NFS-Client Provisioner to deploy nfs provisioner.

helm install --name my-mongodb stable/mongodb --set persistence.storageClass=nfs-client --set persistence.accessMode=ReadWriteMany --set persistence.size=250Gi

persistence.storageClass=nfs-client: refers to your nfs provisioner storage class name

persistence.accessMode and persistence.size are self explanatory.

You will get the following:
NAME:   my-mongodb
LAST DEPLOYED: Wed Oct  9 12:00:05 2019
NAMESPACE: thingsboard
STATUS: DEPLOYED
RESOURCES:
==> v1/PersistentVolumeClaim
NAME        STATUS   VOLUME      CAPACITY  ACCESS MODES  STORAGECLASS  AGE
my-mongodb  Pending  nfs-client  0s
==> v1/Pod(related)
NAME                        READY  STATUS   RESTARTS  AGE
my-mongodb-f5b999859-s4r8m  0/1    Pending  0         0s
==> v1/Secret
NAME        TYPE    DATA  AGE
my-mongodb  Opaque  1     0s
==> v1/Service
NAME        TYPE       CLUSTER-IP      EXTERNAL-IP  PORT(S)    AGE
my-mongodb  ClusterIP  10.103.134.182  <none>       27017/TCP  0s
==> v1beta1/Deployment
NAME        READY  UP-TO-DATE  AVAILABLE  AGE
my-mongodb  0/1    1           0          0s
NOTES:
** Please be patient while the chart is being deployed **
MongoDB can be accessed via port 27017 on the following DNS name from within your cluster:
my-mongodb.thingsboard.svc.cluster.local
To get the root password run:
export MONGODB_ROOT_PASSWORD=$(kubectl get secret --namespace thingsboard my-mongodb -o jsonpath="{.data.mongodb-root-password}" | base64 --decode)
To connect to your database run the following command:
kubectl run --namespace thingsboard my-mongodb-client --rm --tty -i --restart='Never' --image bitnami/mongodb --command -- mongo admin --host my-mongodb --authenticationDatabase admin -u root -p $MONGODB_ROOT_PASSWORD
To connect to your database from outside the cluster execute the following commands:
kubectl port-forward --namespace thingsboard svc/my-mongodb 27017:27017 &
    mongo --host 127.0.0.1 --authenticationDatabase admin -p $MONGODB_ROOT_PASSWORD