A cluster admin can use StorageClass to define different storage classes for Tencent Kubernetes Engine (TKE) clusters. TKE provides the block storage StorageClass by default. You can use both StorageClass and PersistentVolumeClaim to dynamically create required storage resources. This document describes how to create a StorageClass of the Cloud Block Storage (CBS) type by using the console and Kubectl, and how to customize the template required by CBS disks.
Console Operation Directions
Creating StorageClass
1. Log in to the TKE console and click Cluster in the left sidebar.
2. Click the ID of the cluster for which a StorageClass needs to be created to go to the cluster details page.
3. Click Storage > StorageClass in the left sidebar, as shown in the following figure.
4. Click Create to go to the Create StorageClass page, where you can set the parameters as required, as shown in the following figure.
The main parameters are described as follows:
Name: Set a custom name. This document uses cbs-test as an example.
Provisioner: Select Cloud Block Storage.
Region: The region where the current cluster is located.
Availability zone: Select the availability zones that support CBS disks in the current region as required.
Billing mode: The pay-as-you-go billing mode is provided. It allows you to enable and terminate instances at any time. The instances are billed based on actual usage, and the Delete and Retain reclaim policies are supported.
Disk type: Premium Cloud Disk, SSD Cloud Disk, and Enhanced SSD Cloud Disk are supported. Different availability zones may have different disk types. For more information, see Cloud Disk Types. Select a disk type as prompted by the console.
Reclaim policy: The reclaim policy for cloud disks. Generally, the Delete and Retain reclaim policies are provided, which depends on the selected billing mode. For data security, we recommend that you select Retain.
Volume binding mode: The modes of Bind now and Wait for scheduling are available. Different modes support different volume binding policies. Refer to the following information to select the appropriate mode:
Bind now: PVCs created via the storageclass will be directly bound with the PV and allocated.
Wait for scheduling: PVCs created via the storageclass will not be bound with the PV and allocated until the pod that uses the PVCs is created.
Scheduled snapshot: Setting scheduled snapshot policy can effectively protect data security, but data backup will generate certain fees. For more information, see Snapshot Overview.
Note:
The default-policy configuration provided by TKE for backup includes the date of backup execution, time point of backup execution, and backup retention period.
5. Click Create a StorageClass to complete the process.
Creating a PVC by using a specified StorageClass
1. On the Cluster management page, select the ID of the cluster for which a PVC needs to be created.
2. On the cluster details page, choose Storage > PersistentVolumeClaim in the left sidebar to go to the PersistentVolumeClaim page, as shown in the following figure.
3. Click Create to go to the Create a PersistentVolumeClaim page, where you can set key PVC parameters as required, as shown in the following figure.
The main parameters are described as follows:
Name: set a custom name. This document uses cbs-pvc as an example.
Namespace: Select default.
Provisioner: Select Cloud Block Storage.
R/W permission: CBS disks only support Single machine read and write.
StorageClass: Specify a StorageClass as required. This document uses the cbs-test created in the step of Creating a StorageClass as an example.
Note:
The PVC and PV will be bound to the same StorageClass.
If you do not specify a StorageClass, the value of StorageClass for the corresponding PVC is empty, and the value of the storageClassName field in the corresponding YAML file is a null string.
PersistVolume: Specify a PersistentVolume as required. In the example in this document, no PersistentVolume is specified.
Note:
The system first searches the current cluster to see whether there are PVs that meet the binding rules. If no, the system dynamically creates a PV to be bound based on the PVC and the selected StorageClass.
If StorageClass is not specified, then PersistVolume must be specified.
Disk type: Based on the selected StorageClass, the available disk types are displayed: Premium Cloud Disk, SSD Cloud Disk and Enhanced SSD Cloud Disk.
Capacity: When PersistentVolume is not specified, you need to indicate the desired capacity of the cloud disk. The capacity must be a multiple of 10. For premium cloud disk, the minimum capacity is 10 GB, and for SSD cloud disk and enhance SSD cloud disk, the minimum capacity is 20 GB.
Cost: Based on the above parameters, calculate the cost of the corresponding cloud disk. For more information, see Billing Modes.
4. Click Create a PersistentVolumeClaim to complete the creation.
Creating a StatefulSet to mount a PVC volume
Note:
This step creates a StatefulSet workload as an example.
1. On the details page of the desired cluster, choose Workload > StatefulSet in the left sidebar to go to the StatefulSet page.
2. Click Create to go to the Create Workload page. For more information, see Creating a StatefulSet. Then, mount a volume as required, as shown in the following figure.
Volume (optional):
Mount method: Select Use existing PVC.
Volume name: Set a custom name. This document uses cbs-vol as an example.
# If this line is present, it will become the default-class, and if you do not specify a type when creating a PVC, this type will be used automatically.
name: cloud-premium
# If the CBS-CSI add-on is installed for the TKE cluster, enter `com.tencent.cloud.csi.cbs` for `provisioner`.
# If the CBS-CSI add-on is not installed, enter `cloud.tencent.com/qcloud-cbs` for `provisioner` (this capability is deprecated in v1.20 and later versions).
provisioner: com.tencent.cloud.csi.cbs
parameters:
type: CLOUD_PREMIUM
renewflag: NOTIFY_AND_AUTO_RENEW
paymode: POSTPAID_BY_HOUR
aspid: asp-123
reclaimPolicy: Retain
volumeBindingMode: WaitForFirstConsumer
The following table lists the supported parameters.
Parameter
Description
type
This includes CLOUD_PREMIUM (Premium cloud disk), CLOUD_SSD (SSD cloud disk) and CLOUD_HSSD (enhanced SSD cloud disk).
zone
Availability zone. If an availability zone is specified, the cloud disk is created in this availability zone. If no availability zone is specified, the availability zones of all nodes are obtained and one is selected at random. For the identifiers of all Tencent Cloud regions, see Regions and Availability Zones.
paymode
The billing method of the cloud disk. The default value is POSTPAID_BY_HOUR (pay-as-you-go), which supports the Retain and Delete reclaim policies. Retain is only available in clusters later than V1.8.
volumeBindingMode
The volume binding mode. Two modes are supported: Immediate (bind now) and WaitForFirstConsumer (wait for scheduling).
reclaimPolicy
The reclaim policy. Two policies are supported: Delete and Retain.
renewflag
CBS renew mode. The default value is NOTIFY_AND_MANUAL_RENEW.
NOTIFY_AND_AUTO_RENEW indicates that the created CBS supports notifications upon expiration and automatic renewal by month.
NOTIFY_AND_MANUAL_RENEW indicates that the created CBS supports notifications upon expiration but not automatic renewal.
DISABLE_NOTIFY_AND_MANUAL_RENEW indicates that the created CBS does not support notifications upon expiration or automatic renewal.
aspid
Snapshot policy ID. The created cloud disk will be automatically bound with this policy. Binding failure does not affect the creation of the cloud disk.
Creating a multi-Pod StatefulSet
You can use a cloud disk to create a multi-pod StatefulSet. The sample YAML file is as follows:
Note:
The apiVersion of the resource object varies based on the cluster Kubernetes version. You can run the command kubectl api-versions to view the apiVersion of the current resource object.
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web
spec:
selector:
matchLabels:
app: nginx
serviceName:"nginx"
replicas:3
template:
metadata:
labels:
app: nginx
spec:
terminationGracePeriodSeconds:10
containers:
-name: nginx
image: nginx
ports:
-containerPort:80
name: web
volumeMounts:
-name: www
mountPath: /usr/share/nginx/html
volumeClaimTemplates:# the system automatically creates a PVC and then automatically creates a PV.
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