:Mount cloud disks on an RDS Custom container series node

Prerequisites

An RDS Custom container series AI node is created.

Billing

Cloud disks are billed on a pay-as-you-go basis in RDS.

• When you declare a persistent volume (PV) claim (PVC) and start a pod for the first time, a cloud disk is created and billing begins. The billing cycle continues until the cloud disk is released.

• After a pod is released, the cloud disk continues to exist and incur charges. You can use the cloud disk through the PVC when you start a new pod. If you no longer need the disk, you must manually release the Custom container cloud disk.

Notes

• You can mount Custom container cloud disks only on Custom container nodes.

• You cannot scale out disk capacity by modifying a PVC.

• You can use a PVC to declare only cloud disks with performance levels that the cluster supports.

Step 1: Configure supported cloud disk performance levels for the ACK cluster

• You can configure the performance levels when you create an RDS Custom container series node in the ACK cluster for the first time.

  

• You can modify the supported cloud disk performance levels for an existing ACK cluster.

  1. Log on to the RDS console. In the navigation pane on the left, click RDS Custom > Custom Container Cluster.

  2. On the Custom Container Cluster page, click the ACK Pro Cluster List tab.

  3. Find the cluster that you want to manage and click Update Cluster Settings in the Actions column.

  4. On the page that appears, configure the supported cloud disk performance levels for the cluster and click OK.

     

     Important

     You can only add new cloud disk performance levels.

Step 2: Use a cloud disk on an RDS Custom container node

To create and use a Custom container cloud disk, declare a PVC in the ACK cluster. When you use the PVC to start a pod for the first time, the system creates a cloud disk in the cluster with the specified performance level and storage capacity.

1. Create a PVC.

   1. Create a YAML file, such as pvc-disk-test-pl0.yaml. Set the storageClassName field to aliclouddb-vnode-disk-essd-<disk performance level>. For example:

      apiVersion: v1
      kind: PersistentVolumeClaim
      metadata:
        name: disk-test-pl0
        namespace: default
      spec:
        accessModes:
        - ReadWriteOnce # The persistent volume can be mounted as read-write by a single node.
        resources:
          requests:
            storage: 30Gi
        storageClassName: aliclouddb-vnode-disk-essd-pl0
        volumeMode: Filesystem

   2. Run the following command to create the PVC.

      kubectl create -f pvc-disk-test-pl0.yaml

2. Deploy a pod and mount the PVC.

   1. Create a YAML file, such as pod.yaml, and specify the mount path for the cloud disk. For example, to mount the cloud disk to the /data path:

      # Pod configuration
      apiVersion: v1
      kind: Pod
      metadata:
        name: disktest-pl0
      spec:
        containers:
        - command:
          - sh
          - -c
          - echo hello world; sleep infinity;
          image: aliclouddb-pub-registry-vpc.cn-beijing.cr.aliyuncs.com/aliclouddb-public/des-ai-nv:25.05-sglang0.4.6.post4-pytorch2.6-cu124-20250513-serverless
          imagePullPolicy: IfNotPresent
          name: disktest-pl0
          ports:
          - containerPort: 8000
            name: restful
            protocol: TCP
          resources:
            requests:
              cpu: "10"
              memory: "100Gi"
            limits:
              cpu: "10"
              memory: "100Gi"
          volumeMounts:
            - mountPath: /data
              name: data-volume
        volumes:
          - name: data-volume
            persistentVolumeClaim:
              claimName: disk-test-pl0
        restartPolicy: Always
        nodeSelector:
          alibabacloud.com/virtual-node: "true"
        tolerations:
        - effect: NoSchedule
          key: virtual-kubelet.io/provider
          value: aliclouddb

   2. Run the following command to deploy the pod and mount the PVC.

      kubectl apply -f pod.yaml

3. (Optional) Log on to the pod to view the mounted Custom container cloud disk.

   kubectl get pods  # Check the pod status
   
   kubectl exec -it <pod_name> -- /bin/bash   # Enter the container
   
   df -h  # Check the mount path

   Example response:

   

Release a Custom container cloud disk

To release the Custom container cloud disk, delete the PVC and the associated persistent volume (PV).

kubectl delete pvc <pvc_name>

kubectl delete pv <pv_name>

References

For more information, see Introduction to RDS Custom.