k8s中的副本控制器保证了pod的始终存储，却保证不了pod中的数据。只有启动一个新pod的，之前pod中的数据会随着容器的删掉而丢失！
PersistentVolume（一些简称PV）：由管理员添加的的一个存储的描述，是一个全局资源，包含存储的类型，存储的大小和访问模式等。它的生命周期独立于Pod，例如当使用它的Pod销毁时对PV没有影响。
PersistentVolumeClaim（一些简称PVC）：是Namespace里的资源，描述对PV的一个请求。请求信息包含存储大小，访问模式等。
yum install nfs-utils -y
[root@master ~]# vim /etc/exports [root@master ~]# cat /etc/exports /data 192.168.118.0/24(rw,async,no_root_squash,no_all_squash) [root@master ~]# mkdir /data/k8s -p [root@master ~]# systemctl restart rpcbind [root@master ~]# systemctl restart nfs
[root@node01 ~]# showmount 192.168.118.18 -e Export list for 192.168.118.18: /data 192.168.118.0/24 [root@node02 ~]# showmount 192.168.118.18 -e Export list for 192.168.118.18: /data 192.168.118.0/24
1、文件结构组成
[root@master volume]# ll total 20 -rw-r--r-- 1 root root 153 May 15 13:59 test2-pvc.yaml -rw-r--r-- 1 root root 278 May 15 11:57 test2-pv.yaml -rw-r--r-- 1 root root 278 May 15 13:40 test3-pv.yaml -rw-r--r-- 1 root root 152 May 15 13:55 test-pvc.yaml -rw-r--r-- 1 root root 278 May 15 13:40 test-pv.yaml
2、创建pv test
[root@master volume]# cat test-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: test
labels:
type: test
spec:
capacity:
storage: 10Gi
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Recycle
nfs:
path: "/data/k8s"
server: 192.168.118.18
readOnly: false
[root@master volume]# kubectl create -f test-pv.yaml
persistentvolume "test" created
[root@master volume]# kubectl get pv
NAME CAPACITY ACCESSMODES RECLAIMPOLICY STATUS CLAIM REASON AGE
test 10Gi RWX Recycle Available 12s
2、创建pv test2
[root@master volume]# mv test-pv.yaml test2-pv.yaml
[root@master volume]# cat test2-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: test2
labels:
type: test
spec:
capacity:
storage: 5Gi
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Recycle
nfs:
path: "/data/k8s"
server: 192.168.118.18
readOnly: false
[root@master volume]# kubectl create -f test2-pv.yaml
persistentvolume "test2" created
[root@master volume]# kubectl get pv
NAME CAPACITY ACCESSMODES RECLAIMPOLICY STATUS CLAIM REASON AGE
test 10Gi RWX Recycle Available 25m
test2 5Gi RWX Recycle Available 40s
4、创建pvc
[root@master volume]# cat test-pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: nfs
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 1Gi
[root@master volume]# kubectl create -f test-pvc.yaml
persistentvolumeclaim "nfs" created
[root@master volume]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESSMODES AGE
nfs Bound test2 5Gi RWX 23s
在多个pvc中优先选择满足条件中最小的pvc
[root@master volume]# kubectl get pv NAME CAPACITY ACCESSMODES RECLAIMPOLICY STATUS CLAIM REASON AGE test 10Gi RWX Recycle Available 2h test2 5Gi RWX Recycle Bound default/nfs 1h
1、修改pv test 2如下：
[root@master volume]# cat test2-pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: nfs2
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 7Gi
[root@master volume]# kubectl create -f test2-pvc.yaml
persistentvolumeclaim "nfs2" created
2、查看pv与pvc绑定情况
[root@master volume]# kubectl get pv NAME CAPACITY ACCESSMODES RECLAIMPOLICY STATUS CLAIM REASON AGE test 10Gi RWX Recycle Bound default/nfs2 2h test2 5Gi RWX Recycle Bound default/nfs 2h test3 6Gi RWX Recycle Available 9m
kubernetes云平台管理实战：k8s存储pv和pvc（十九）
原文：https://www.cnblogs.com/luoahong/p/12937479.html