(kubectl) Creating a StatefulSet Mounted with an OBS Volume

Scenario

CCE allows you to use an existing OBS volume to create a StatefulSet through a PersistentVolumeClaim (PVC).

Prerequisites

• You have created a CCE cluster and installed the FlexVolume plug-in (storage-driver) in the cluster.
• The AK/SK has been uploaded. For details, see Preparations.

Notes and Constraints

The following configuration example applies to clusters of Kubernetes 1.13 or earlier.

Procedure

1. Create an OBS volume by referring to Creating an OBS Volume and obtain the PVC name.
2. Use kubectl to connect to the cluster. For details, see Connecting to a Cluster Using kubectl.
3. Create a YAML file for creating the workload. Assume that the file name is obs-statefulset-example.yaml.

   touch obs-statefulset-example.yaml

   vi obs-statefulset-example.yaml

   Example YAML:

   apiVersion: apps/v1
   kind: StatefulSet
   metadata:
     name: obs-statefulset-example
     namespace: default
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: obs-statefulset-example
     serviceName: qwqq
     template:
       metadata:
         annotations:
           metrics.alpha.kubernetes.io/custom-endpoints: '[{"api":"","path":"","port":"","names":""}]'
           pod.alpha.kubernetes.io/initialized: "true"
         creationTimestamp: null
         labels:
           app: obs-statefulset-example
       spec:
         affinity: {}
         containers:	
           image: nginx:latest
           imagePullPolicy: Always
           name: container-0
           volumeMounts:
           - mountPath: /tmp
             name: pvc-obs-example
         imagePullSecrets:
         - name: default-secret
         volumes:
           - name: pvc-obs-example
             persistentVolumeClaim:
               claimName: cce-obs-demo

   Table 1 Key parameters

   Parameter	Description
   replicas	Number of pods.
   name	Name of the created workload.
   image	Image used by the workload.
   mountPath	Mount path in the container.
   serviceName	Service corresponding to the workload. For details about how to create a Service, see Creating a StatefulSet.
   claimName	Name of an existing PVC.

4. Create the StatefulSet.

   kubectl create -f obs-statefulset-example.yaml