相对于静态存储, 动态存储的优势:

                ● 管理员无需预先创建大量的PV作为存储资源;

                ● 静态存储需要用户申请PVC时保证容量和读写类型与预置PV的容量及读写类型完全匹配, 而动态存储则无需如此.

        本文使用NFS存储类型完成动态存储, 需要如下步骤.

1. 创建NFS服务

        参见上篇文章: 安装NFS服务

2. 部署存储供应卷

        根据PVC的请求, 动态创建PV存储.

[root@bogon statefulset]# cat deployment-nfs.yaml kind: Deployment apiVersion: extensions/v1beta1 metadata: name: nfs-client-provisioner spec: replicas: 1 strategy: type: Recreate template: metadata: labels: app: nfs-client-provisioner spec: serviceAccount: nfs-provisioner containers: - name: nfs-client-provisioner image: registry.cn-hangzhou.aliyuncs.com/open-ali/nfs-client-provisioner volumeMounts: - name: nfs-client-root mountPath: /persistentvolumes env: - name: PROVISIONER_NAME value: fuseim.pri/ifs - name: NFS_SERVER value: 192.168.64.133 - name: NFS_PATH value: /home/nfs volumes: - name: nfs-client-root nfs: server: 192.168.64.133 path: /home/nfs

        创建:

[root@bogon statefulset]# kubectl create -f deployment-nfs.yaml [root@bogon statefulset]# kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE nfs-client-provisioner 1 1 1 1 36m

3 部署storageclass

[root@bogon statefulset]# cat storageclass-nfs.yaml apiVersion: storage.k8s.io/v1beta1 kind: StorageClass metadata: name: managed-nfs-storage provisioner: fuseim.pri/ifs

        创建:

[root@bogon statefulset]# kubectl create -f storageclass-nfs.yaml [root@bogon statefulset]# kubectl get storageclass NAME PROVISIONER AGE managed-nfs-storage fuseim.pri/ifs 36m

4. 部署StatefulSet验证动态分配

[root@bogon statefulset]# cat statefulset-nfs.yaml apiVersion: apps/v1beta1 kind: StatefulSet metadata: name: web spec: serviceName: "nginx1" replicas: 1 volumeClaimTemplates: - metadata: name: test annotations: volume.beta.kubernetes.io/storage-class: "managed-nfs-storage" spec: accessModes: [ "ReadWriteOnce" ] resources: requests: storage: 2Gi template: metadata: labels: app: nginx1 spec: serviceAccount: nfs-provisioner containers: - name: nginx1 image: nginx:1.7.9 volumeMounts: - mountPath: "/mnt" name: test

        创建:

[root@bogon statefulset]# kubectl create -f statefulset-nfs.yaml statefulset "web" created 

        查看pod一直在创建中:

[root@bogon statefulset]# kubectl get pod NAME READY STATUS RESTARTS AGE nfs-client-provisioner-56dd854578-p4z8x 1/1 Running 0 3m web-0 0/1 ContainerCreating 0 2m

        开始排错, 查看pod详细信息:

[root@bogon statefulset]# kubectl describe pod web-0 Name: web-0 Namespace: default ... Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Scheduled 2m default-scheduler Successfully assigned web-0 to 192.168.64.134 Normal SuccessfulMountVolume 2m kubelet, 192.168.64.134 MountVolume.SetUp succeeded for volume "default-token-6bgzc" Warning FailedMount 34s kubelet, 192.168.64.134 Unable to mount volumes for pod "web-0_default(f7f0dd6a-88d1-11e8-87be-000c2964ecfc)": timeout expired waiting for volumes to attach/mount for pod "default"/"web-0". list of unattached/unmounted volumes=[test]

        查看storageclass:

[root@bogon statefulset]# kubectl describe storageclass managed-nfs-storage Name: managed-nfs-storage ... Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal ExternalProvisioning 3s (x18 over 4m) persistentvolume-controller waiting for a volume to be created, either by external provisioner "fuseim.pri/ifs" or manually created by system administrator

        可以判断是存储供应出的问题.

        查看供应日志:

[root@bogon statefulset]# kubectl logs -f nfs-client-provisioner-56dd854578-p4z8x E0716 08:33:59.141420 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:411: Failed to list *v1.PersistentVolumeClaim: persistentvolumeclaims is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumeclaims at the cluster scope E0716 08:33:59.141995 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:384: Failed to list *v1.StorageClass: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:default:default" cannot list storageclasses.storage.k8s.io at the cluster scope E0716 08:34:00.121657 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:412: Failed to list *v1.PersistentVolume: persistentvolumes is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumes at the cluster scope E0716 08:34:00.147990 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:411: Failed to list *v1.PersistentVolumeClaim: persistentvolumeclaims is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumeclaims at the cluster scope E0716 08:34:00.152728 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:384: Failed to list *v1.StorageClass: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:default:default" cannot list storageclasses.storage.k8s.io at the cluster scope E0716 08:34:01.127057 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:412: Failed to list *v1.PersistentVolume: persistentvolumes is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumes at the cluster scope E0716 08:34:01.153919 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:411: Failed to list *v1.PersistentVolumeClaim: persistentvolumeclaims is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumeclaims at the cluster scope E0716 08:34:01.159801 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:384: Failed to list *v1.StorageClass: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:default:default" cannot list storageclasses.storage.k8s.io at the cluster scope E0716 08:34:02.134286 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:412: Failed to list *v1.PersistentVolume: persistentvolumes is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumes at the cluster scope E0716 08:34:02.156738 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:411: Failed to list *v1.PersistentVolumeClaim: persistentvolumeclaims is forbidden: User "system:serviceaccount:default:default" cannot list persistentvolumeclaims at the cluster scope E0716 08:34:02.163755 1 reflector.go:201] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:384: Failed to list *v1.StorageClass: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:default:default" cannot list storageclasses.storage.k8s.io at the cluster scope 

        报错没有权限. 需要创建权限体系, 步骤如下.

5 构建权限体系

        ServiceAccount也是一种账号, 供运行在pod中的进程使用, 为pod中的进程提供必要的身份证明.

        创建serviceaccount

[root@bogon statefulset]# cat serviceaccount.yaml apiVersion: v1 kind: ServiceAccount metadata: name: nfs-provisioner

        创建role

[root@bogon statefulset]# cat serviceaccount.yaml apiVersion: v1 kind: ServiceAccount metadata: name: nfs-provisioner [root@bogon statefulset]# cat clusterrole.yaml kind: ClusterRole apiVersion: rbac.authorization.k8s.io/v1 metadata: name: nfs-provisioner-runner rules: - apiGroups: [""] resources: ["persistentvolumes"] verbs: ["get", "list", "watch", "create", "delete"] - apiGroups: [""] resources: ["persistentvolumeclaims"] verbs: ["get", "list", "watch", "update"] - apiGroups: ["storage.k8s.io"] resources: ["storageclasses"] verbs: ["get", "list", "watch"] - apiGroups: [""] resources: ["events"] verbs: ["watch", "create", "update", "patch"] - apiGroups: [""] resources: ["services", "endpoints"] verbs: ["get"] - apiGroups: ["extensions"] resources: ["podsecuritypolicies"] resourceNames: ["nfs-provisioner"] verbs: ["use"]

        账户和角色绑定

[root@bogon statefulset]# cat clusterrolebinding.yaml kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata: name: run-nfs-provisioner subjects: - kind: ServiceAccount name: nfs-provisioner namespace: default roleRef: kind: ClusterRole name: nfs-provisioner-runner apiGroup: rbac.authorization.k8s.io

        创建:

kubectl create -f serviceaccount.yaml -f clusterrole.yaml -f clusterrolebinding.yaml

        在存储供应卷和StatefulSet文件中分别放入如下配置:

serviceAccount: nfs-provisioner

        例如StatefulSet文件:

[root@bogon statefulset]# cat statefulset-nfs.yaml apiVersion: apps/v1beta1 kind: StatefulSet metadata: name: web spec: serviceName: "nginx1" replicas: 1 volumeClaimTemplates: - metadata: name: test annotations: volume.beta.kubernetes.io/storage-class: "managed-nfs-storage" spec: accessModes: [ "ReadWriteOnce" ] resources: requests: storage: 2Gi template: metadata: labels: app: nginx1 spec: serviceAccount: nfs-provisioner containers: - name: nginx1 image: nginx:1.7.9 volumeMounts: - mountPath: "/mnt" name: test

         kubernetes1.6以后默认开启rbac, 做完如上操作然后再次创建即可.