(kubectl) Creating a StatefulSet Mounted with an SFS Volume

Scenario

CCE allows you to use an existing SFS 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.

Notes and Constraints

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

Procedure

1. Create an SFS volume by referring to Creating an SFS Volume and record the volume 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 sfs-statefulset-example.yaml.

   touch sfs-statefulset-example.yaml

   vi sfs-statefulset-example.yaml

   Example YAML:

   apiVersion: apps/v1
   kind: StatefulSet
   metadata:
     name: sfs-statefulset-example
     namespace: default
   spec:
     replicas: 2
     selector:
       matchLabels:
         app: sfs-statefulset-example
     serviceName: qwqq
     template:
       metadata:
         annotations:
           metrics.alpha.kubernetes.io/custom-endpoints: '[{"api":"","path":"","port":"","names":""}]'
           pod.alpha.kubernetes.io/initialized: "true"
         labels:
           app: sfs-statefulset-example
       spec:
         affinity: {}
         containers:
         - image: nginx:latest
           name: container-0
           volumeMounts:
           - mountPath: /tmp
             name: pvc-sfs-example
         imagePullSecrets:
         - name: default-secret
         volumes:
           - name: pvc-sfs-example
             persistentVolumeClaim:
               claimName: cce-sfs-demo

   Table 1 Key parameters

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

   

   spec.template.spec.containers.volumeMounts.name and spec.template.spec.volumes.name must be consistent because they have a mapping relationship.

4. Create the StatefulSet.

   kubectl create -f sfs-statefulset-example .yaml