How to specify the storage-class of the data pvc?

[TLINDEN]

What did you do to encounter the bug?
Deployed the operator and the sample CR.

What did you expect?
It shall be possible to specify the storage-class of the data pvc.

What happened instead?
Seems not to be possible, at least I couldn't find any hint in the CRD for this.

Screenshots

NAME                                               STATUS  VOLUME                                    CAPACITY  ACCESS  MODES    STORAGECLASS  AGE
data-volume-rocketchat-footest-mongodb-instance-0  Bound   pvc-958c8ebb-93ca-4491-84a7-c2fd85664d5b  10G       RWO     csi-lvm  97m           
logs-volume-rocketchat-footest-mongodb-instance-0  Bound   pvc-fc9ef63f-1bbb-449c-8221-94e0af5ed1ff  2G        RWO     csi-lvm  97m 

The class csi-lvm is the default on our cluster, but I'd need to use a cloud storage instead.

Operator Information

• Operator Version: 1.2.0
• MongoDB Image used: 6.0.13

Kubernetes Cluster Information

• Distribution: metal-stack
• Version: 1.28.15
• Image Registry location (quay, or an internal registry): quay

Additional information

% kgp
NAME                                            READY   STATUS  RESTARTS        AGE 
mongodb-kubernetes-operator-57b5b56c6d-2sj89    1/1     Running 0               136m
rocketchat-footest-mongodb-instance-0           2/2     Running 0               100m

k get mdbc
NAME                                   PHASE     VERSION
rocketchat-footest-mongodb-instance   Running   6.0.13                                                                             

• yaml definitions of your MongoDB Deployment(s):

---
apiVersion: mongodbcommunity.mongodb.com/v1
kind: MongoDBCommunity
metadata:
  name: {{ nsname }}-mongodb-instance
  namespace: {{ nsname }}
spec:
  members: 1
  type: ReplicaSet
  version: "6.0.13"
  security:
    authentication:
      modes: ["SCRAM"]
  users:
    - name: {{ rcConfig.mongodb.username }}
      db: {{ rcConfig.mongodb.database }}
      passwordSecretRef:
        name: mongodb-user
      roles:
        - name: clusterAdmin
          db: {{ rcConfig.mongodb.database }}
        - name: userAdminAnyDatabase
          db: {{ rcConfig.mongodb.database }}
      scramCredentialsSecretName: my-scram
  additionalMongodConfig:
    storage.wiredTiger.engineConfig.journalCompressor: zlib

---
apiVersion: v1
kind: Secret
metadata:
  name: mongodb-user
  namespace: {{ nsname }}
type: Opaque
stringData:
  password: {{ rcConfig.mongodb.userpw }}

[shyam-king]

+1 on this, I can't figure how to scale up the size of the volume as well

[TLINDEN]

It's possible to tune the storage configuration using a volumeClaimTemplate, here's how I fixed my issue:

---
apiVersion: mongodbcommunity.mongodb.com/v1
kind: MongoDBCommunity
metadata:
  name: {{ nsname }}-mongodb-instance
  namespace: {{ nsname }}
spec:
  members: 1
  type: ReplicaSet
  version: "6.0.13"
  security:
    authentication:
      modes: ["SCRAM"]
  users:
    - name: {{ rcConfig.mongodb.username }}
      db: {{ rcConfig.mongodb.database }}
      passwordSecretRef:
        name: mongodb-user
      roles:
        - name: clusterAdmin
          db: {{ rcConfig.mongodb.database }}
        - name: userAdminAnyDatabase
          db: {{ rcConfig.mongodb.database }}
        - name: backup
          db: {{ rcConfig.mongodb.database }}
        - name: restore
          db: {{ rcConfig.mongodb.database }}
        - name: dbOwner
          db: {{ rcConfig.mongodb.database }}
      scramCredentialsSecretName: my-scram
  additionalMongodConfig:
    storage.wiredTiger.engineConfig.journalCompressor: zlib
  statefulSet:
    spec:
      # ====> here:
      volumeClaimTemplates:
        - metadata:
            name: data-volume
          spec:
            accessModes: [ "ReadWriteOnce" ]
            resources:
              requests:
                storage: {{ rcConfig.mongodb.storagesize }}
            storageClassName: {{ rcConfig.mongodb.storageclass }}
        - metadata:
            name: logs-volume
          spec:
            accessModes: [ "ReadWriteOnce" ]
            resources:
              requests:
                storage: {{ rcConfig.mongodb.logstoragesize }}
            storageClassName: {{ rcConfig.mongodb.storageclass }}
            
---
apiVersion: v1
kind: Secret
metadata:
  name: mongodb-user
  namespace: {{ nsname }}
type: Opaque
stringData:
  password: {{ rcConfig.mongodb.userpw }}

This repo also contains an example CR configuration with this.

So, this is a documentation issue, there should be more and better documentation.