1. 介紹：

本文介紹的動態生成NAS存儲卷的方案：在一個已有文件系統上，自動生成一個目錄，這個目錄定義為目標存儲卷；

鏡像地址：registry.cn-hangzhou.aliyuncs.com/acs/alicloud-nas-controller:v1.11.5.4-433631d-aliyun

默認生成資源：
生成的PV名字為：pvc-${pvc-uid}
生成目錄的名字：namespace-pvcname-pvname

可以再pvc的annotations中如下聲明，自定義名字：
生成的pv、目錄名字為下面定義的名字。

  annotations:pv-name-created: replace-user-id

2. 部署NAS Controller

創建alicloud-nas-controller，實現動態provider nas pv；
創建alicloud-nas storageclass，為nas pv provision 提供模板；

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:name: alicloud-nas
provisioner: alicloud/nas
reclaimPolicy: Delete
parameters:drivertype: flexvolumenfsversion: "4.0"options: ""---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:name: alicloud-nas-controllernamespace: kube-system
spec:replicas: 1strategy:type: Recreatetemplate:metadata:labels:app: alicloud-nas-controllerspec:tolerations:- effect: NoScheduleoperator: Existskey: node-role.kubernetes.io/master- effect: NoScheduleoperator: Existskey: node.cloudprovider.kubernetes.io/uninitializedserviceAccount: admincontainers:- name: alicloud-nas-controllerimage: registry.cn-hangzhou.aliyuncs.com/acs/alicloud-nas-controller:v1.11.5.4-433631d-aliyunimagePullPolicy: AlwaysvolumeMounts:- mountPath: /persistentvolumesname: nfs-client-rootenv:- name: NFS_SERVERvalue: 154154b095-**.cn-beijing.nas.aliyuncs.com- name: NFS_PATHvalue: /volumes:- name: nfs-client-rootflexVolume:driver: alicloud/nasoptions:path: /server: 154154b095-**.cn-beijing.nas.aliyuncs.comvers: "4.0"

StorageClass使用說明：

drivertype: 用來表示生成pv存儲類型，可選nfs, flexvolume.nfs: 默認選項，表示使用k8s原生NFS驅動掛載；flexvolume: 表示使用阿里云提供的Flexvolume NAS驅動掛載；nfsversion: 掛載nfs使用的版本，支持3，4.0.默認為4.0；drivertype為flexvolume的時候在這里配置；為nfs的時候通過mountOptions 配置；options：為掛載nfs的可選項配置；drivertype為flexvolume的時候在這里配置；為nfs的時候通過mountOptions 配置；

StorageClass舉例：

## 使用kubernetes提供的NFS驅動，并配置mountOptions，reclaimPolicy為Delete；
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:name: alicloud-nas-nfs
mountOptions:
- vers=4.0
- noresvport
provisioner: alicloud/nas
reclaimPolicy: Delete## 使用阿里云提供的Flexvolume NAS驅動，配置nfs版本、options；
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:name: alicloud-nas-flex
provisioner: alicloud/nas
reclaimPolicy: Delete
parameters:drivertype: flexvolumenfsversion: "3"options: "noresvport"

3. 創建應用-Deployment：

kind: PersistentVolumeClaim
apiVersion: v1
metadata:name: replace-user-idannotations:pv-name-created: replace-user-id
spec:storageClassName: alicloud-nasaccessModes:- ReadWriteManyresources:requests:storage: 5Gi
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:name: "deploy-nas"
spec:replicas: 1strategy:type: Recreatetemplate:metadata:labels:app: deploy-nasspec:containers:- name: "nginx"image: "nginx"volumeMounts:- name: pvc-nasmountPath: "/data"volumes:- name: pvc-naspersistentVolumeClaim:claimName: replace-user-id執行：
# userID="hello-123"
# cat deploy.yaml | sed  "s/replace-user-id/\"$userID\"/g" | kubectl create -f -# kubectl get pod | grep deploy-nas
deploy-nas-85696b6bfc-t5dmh         1/1       Running          0          28m# kubectl get pvc | grep hell
hello-123       Bound     hello-123                                  5Gi        RWX            alicloud-nas-flex   28m# kubectl get pv | grep hell
hello-123                                  5Gi        RWX            Delete           Bound      default/hello-123       alicloud-nas-flex                       28m# Nas目錄下查看生成目錄：
# ls -l | grep hello
drwxrwxrwx  2 root root 4096 2月  19 09:58 hello-123

4. 創建應用-StatefulSet：

使用volumeTemplateClaim不支持使用pv-name-created配置pv名字；

apiVersion: v1
kind: Service
metadata:name: nginxlabels:app: nginx
spec:ports:- port: 80name: webclusterIP: Noneselector:app: nginx
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:name: web
spec:replicas: 2serviceName: "nginx"template:metadata:labels:app: nginxspec:containers:- name: nginximage: nginx:alpinevolumeMounts:- mountPath: "/data"name: pvc-stsvolumeClaimTemplates:- metadata:name: pvc-stsspec:accessModes:- ReadWriteOncestorageClassName: alicloud-nas-flexresources:requests:storage: 2Gi創建后查看：
# kubectl get pod | grep web
web-0                               1/1       Running          0          7s
web-1                               1/1       Running          0          4s# kubectl get pvc | grep web
pvc-sts-web-0   Bound     pvc-65ab251a-33ec-11e9-a151-00163e066784   2Gi        RWO            alicloud-nas-flex   13m
pvc-sts-web-1   Bound     pvc-8437c50e-33ed-11e9-a151-00163e066784   2Gi        RWO            alicloud-nas-flex   5m# kubectl get pv | grep web
pvc-65ab251a-33ec-11e9-a151-00163e066784   2Gi        RWO            Delete           Bound      default/pvc-sts-web-0   alicloud-nas-flex                       13m
pvc-8437c50e-33ed-11e9-a151-00163e066784   2Gi        RWO            Delete           Bound      default/pvc-sts-web-1   alicloud-nas-flex                       5m# Nas目錄下查看生成目錄：
# ls -l | grep sts
drwxrwxrwx  2 root root 4096 2月  19 10:16 default-pvc-sts-web-0-pvc-65ab251a-33ec-11e9-a151-00163e066784
drwxrwxrwx  2 root root 4096 2月  19 10:24 default-pvc-sts-web-1-pvc-8437c50e-33ed-11e9-a151-00163e066784

5. 創建應用-Pod：

kind: PersistentVolumeClaim
apiVersion: v1
metadata:name: replace-user-idannotations:pv-name-created: replace-user-id
spec:storageClassName: alicloud-nas-flexaccessModes:- ReadWriteManyresources:requests:storage: 5Gi
---
apiVersion: v1
kind: Pod
metadata:name: "nas-pod"
spec:containers:- name: "nginx"image: "nginx"volumeMounts:- name: pvc-nasmountPath: "/data"volumes:- name: pvc-naspersistentVolumeClaim:claimName: replace-user-id# userID="pod-123"
# cat pod.yaml | sed  "s/replace-user-id/\"$userID\"/g" | kubectl create -f -# kubectl get pod | grep pod
nas-pod                             1/1       Running          0          32s# kubectl get pvc | grep pod
pod-123         Bound     pod-123                                    5Gi        RWX            alicloud-nas-flex   44s# kubectl get pv | grep pod
pod-123                                    5Gi        RWX            Delete           Bound      default/pod-123         alicloud-nas-flex                       48s# ls -l | grep pod
drwxrwxrwx  2 root root 4096 2月  19 10:54 pod-123

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本文作者：kanjunbao

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