這里使用了k8s自身的持久化卷存儲機制：PV和PVC。各組件之間的關系參考下圖：

PV的Access Mode(訪問模式)

The access modes are:

ReadWriteOnce – the volume can be mounted as read-write by a single node

ReadOnlyMany – the volume can be mounted read-only by many nodes

ReadWriteMany – the volume can be mounted as read-write by many nodes

In the CLI, the access modes are abbreviated to:

RWO - ReadWriteOnce

ROX - ReadOnlyMany

RWX - ReadWriteMany

Reclaim Policy(回收策略)

Current reclaim policies are:

Retain – manual reclamation

Recycle – basic scrub (“rm -rf /thevolume/*”)

Delete – associated storage asset such as AWS EBS, GCE PD, Azure Disk, or OpenStack Cinder volume is deleted

Currently, only NFS and HostPath support recycling. AWS EBS, GCE PD, Azure Disk, and Cinder volumes support deletion.

PV是有狀態的資源對象，有以下幾種狀態：

1、Available：空閑狀態

2、Bound：已經綁定到某個pvc上

3、Released：對應的pvc已經刪除，但資源還沒有被回收

4、Failed：pv自動回收失敗

1、創建secret。在secret中，data域的各子域的值必須為base64編碼值。

#echo "AQDchXhYTtjwHBAAk2/H1Ypa23WxKv4jA1NFWw==" | base64

QVFEY2hYaFlUdGp3SEJBQWsyL0gxWXBhMjNXeEt2NGpBMU5GV3c9PQo=

#vim ceph-secret.yaml

apiVersion: v1

kind: Secret

metadata:

name: ceph-secret

data:

key: QVFEY2hYaFlUdGp3SEJBQWsyL0gxWXBhMjNXeEt2NGpBMU5GV3c9PQo=

2、創建pv。pv只能是網絡存儲，不屬于任何node，但可以在每個node上訪問。pv并不是定義在pod上的，而是獨立定義于pod之外。目前pv僅支持定義存儲容量。

#vim ceph-pv.yml

apiVersion: v1

kind: PersistentVolume

metadata:

name: cephfs

spec:

capacity:

storage: 10Gi

accessModes:

- ReadWriteMany

fsType: xfs

cephfs:

monitors:

- 172.16.100.5 :6789

- 172.16.100.6 :6789

- 172.16.100.7 :6789

path: /opt/eshop_dir/eshop

user: admin

secretRef:

name: ceph-secret

3、創建pvc

#vim ceph-pvc.yml

kind: PersistentVolumeClaim

apiVersion: v1

metadata:

name: cephfs

spec:

accessModes:

- ReadWriteMany

resources:

requests:

storage: 8Gi

4、查看pv和pvc

#kubectl get pv

cephfs 10Gi RWX Retain Bound default/cephfs 2d

#kubectl get pvc

cephfs Bound cephfs 10Gi RWX 2d

5、創建rc，這個只是測試樣例

#vim ceph-rc.yml

kind: ReplicationController

metadata:

name: cephfstest

labels:

name: cephfstest

spec:

replicas: 4

selector:

name: cephfstest

template:

metadata:

labels:

name: cephfstest

spec:

containers:

- name: cephfstest

image: 172.60.0.107/pingpw/nginx-php:v4

env:

- name: GET_HOSTS_FROM

value: env

ports:

- containerPort: 81

volumeMounts:

- name: cephfs

mountPath: "/opt/cephfstest"

volumes:

- name: cephfs

persistentVolumeClaim:

claimName: cephfs

5、查看pod

#kubectl get pod -o wide

cephfstest-09j37 1/1 Running 0 2d 10.244.5.16 kuber-node03

cephfstest-216r6 1/1 Running 0 2d 10.244.3.25 kuber-node01

cephfstest-4sjgr 1/1 Running 0 2d 10.244.4.26 kuber-node02

cephfstest-p2x7c 1/1 Running 0 2d 10.244.6.22 kuber-node04

總結

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