#yyds干货盘点#--k8s-存储

容器部署过程中一般有以下三种数据：

• 启动时需要的初始数据，可以是配置文件
• 启动过程中产生的临时数据，该临时数据需要多个容器间共享
• 启动过程中产生的持久化数据

我们希望容器重启可以保存以上类型的数据，所以存储卷就必须使用，那么应对以上不同类型需求，我们使用什么类型存储卷呢？

volumes：
启动依赖数据：configmap secret 
临时存储数据：emptyDir hostPath
持久化数据：nfs cephfs GlutserFS cloud等

存储系统与应用系统区分开，单独资源对象， 它不直接和Pod发生关系，通过另一个资源对象PersistentVolumeClaim来绑定关联,生命周期与POD关联。

举例几个典型的类型：

emptyDir
apiVersion: v1
kind: Pod
metadata:
name: demo
labels:
purpose: demonstrate-envars
spec:
volumes: - name: volume1
emptyDir:{}
containers: - name: demo1
image: busybox
command: ['sh','-c','sleep 5000']
volumeMounts: - mountPath:/xx
name: volume1 - name: demo2
image: busybox
command: ['sh','-c','sleep 5000']
volumeMounts: - mountPath:/xx
name: volume1

hostpath
apiVersion: v1
kind: Pod
metadata:
name: demo
labels:
purpose: demonstrate-envars
spec:
volumes: - name: volume1
hostPath:
path:/zz
containers: - name: demo1
image: busybox
command: ['sh','-c','sleep 5000']
volumeMounts: - mountPath:/xx
name: volume1 - name: demo2
image: busybox
command: ['sh','-c','sleep 5000']
volumeMounts: - mountPath:/xx
name: volume1

NFS
apiVersion: v1
kind: Pod
metadata:
labels:
run: nginx
name: nginx
spec:
volumes: - name: nfs
nfs:
server: 192.168.26.102
path:"/123" containers: - image: nginx
name: nginx
volumeMounts: - name: nfs
mountPath:"/usr/share/nginx/html"

issci存储
apiVersion: v1
kind: Pod
metadata:
name: iscsipd
spec:
containers: - name: iscsipd-rw
image: nginx
volumeMounts: - mountPath:"/mnt/iscsipd"
name: iscsipd-rw
volumes: - name: iscsipd-rw
iscsi:
targetPortal: 192.168.26.102:3260
iqn: iqn.2018-10.cc.rhce:disk
lun: 0
fsType: xfs
readOnly: fals

主要来讲讲持久化存储PV：

PV的预制创建有两种模式：静态模式和动态模式。

静态模式：除创建PVC外，还需手动创建PV。

动态模式：只需创建PVC，系统根据PVC自动创建PV。

apiVersion: v1 
kind: PersistentVolume
metadata: 
name: pv0003 
spec: 
capacity: 
storage: 5Gi 
volumeMode: Filesystem
accessModes: 
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle 
storageClassName: slow 
mountOptions: 
- hard 
- nfsvers=4.1 
nfs: 
path: /tmp
server: 172.17.0.2

那么对于用户来说更关心的是什么呢？存储访问模式，存储大小，甚至类型适配能力等。这就需要我们申明存储，所以引入持久化存储申明（PVC）

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: redis-pv-claim
labels:
app: redis
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
storageClassName：sata

下面放一个示例，当然你也可以k8s官网文档去看。

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
annotations:
volume.beta.kubernetes.io/storage-class: sata
volume.beta.kubernetes.io/storage-provisioner: 
flexvolume-huawei.com/fuxivol
labels:
failure-domain.beta.kubernetes.io/region: 
southchina
failure-domain.beta.kubernetes.io/zone: kvmxen.dc1
name: test
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 10Gi
spec:
containers:
- image: nginx:latest
imagePullPolicy: IfNotPresent
name: container-0
volumeMounts:
- name: test
mountPath: /tmp
volumes:
- persistentVolumeClaim:
claimName: test
name: test

PS：代码块YAML格式缩进有问题。