IOMesh for MongoDB

Setup k8s Cluster Storage

1. Create a file named iomesh-mongodb-sc.yaml with the following contents:

   kind: StorageClass
   apiVersion: storage.k8s.io/v1
   metadata:
     name: iomesh-mongodb-sc
   provisioner: com.iomesh.csi-driver # driver.name in values.yaml when install IOMesh
   reclaimPolicy: Retain
   allowVolumeExpansion: true
   parameters:
     csi.storage.k8s.io/fstype: "ext4"
     replicaFactor: "2"
     thinProvision: "true"
   

2. Apply the yaml config:

   kubectl apply -f iomesh-mongodb-sc.yaml
   

Deploy MongoDB

Create a headless Service for MongoDB

1. Create a Service used for DNS lookups between MongoDB Pods and the clients within your cluster

   apiVersion: v1
   kind: Service
   metadata:
     name: mongo
     labels:
       name: mongo
   spec:
     ports:
       - port: 27017
         targetPort: 27017
     clusterIP: None
     selector:
       role: mongo
   

2. Apply the yaml config:

   kubectl apply -f mongodb-service.yaml
   

Create MongoDB cluster using pv provided for IOMesh Storage

1. Use StatefulSet to create a MongoDB cluster

   apiVersion: apps/v1beta1
   kind: StatefulSet
   metadata:
     name: mongo
   spec:
     selector:
       matchLabels:
         role: mongo
         environment: test
     serviceName: "mongo"
     replicas: 3
     template:
       metadata:
         labels:
           role: mongo
           environment: test
       spec:
         terminationGracePeriodSeconds: 10
         containers:
         - name: mongo
           image: mongo
           command:
             - mongod
             - "--replSet"
             - rs0
             - "--smallfiles"
             - "--noprealloc"
           ports:
             - containerPort: 27017
           volumeMounts:
             - name: mongo-persistent-storage
               mountPath: /data/db
         - name: mongo-sidecar
           image: cvallance/mongo-k8s-sidecar
           env:
             - name: MONGO_SIDECAR_POD_LABELS
               value: "role=mongo,environment=test"
     volumeClaimTemplates:
     - metadata:
         name: mongodb-data
       spec:
         accessModes: [ "ReadWriteOnce" ]
         storageClassName: iomesh-mongodb-sc # storageClass created above
         resources:
           requests:
             storage: 10Gi
   

2. Apply the yaml config:

   kubectl apply -f mongodb-statefulset.yaml
   

IOMesh Storage will create Persistent Volumes for each MongoDB pod. These volumes use ext4 file system with a replica factor of 2 and thin provision.

Operate MongoDB Data

Users can use the features provided by IOMesh storage to perform such operations as expansion/snapshot/rollback/clone of the Persistent Volumes where MongoDB data are located, see the reference for details application-operations