openshift持久化存储

存储支持方式：NFS、GlusterFs、cep、samba等
以下以NFS为例，构建pod的持久化存储
1.创建NFS共享

mkdir /var/lib/mynfs
chown nfsnobody.nfsnobody /var/lib/mynfs
chmod 700 /var/lib/mynfs
#如果在/root目录下，需要修改/root目录的权限,否则共享出去的nfs无法挂载

cat /etc/export.d/my.export
/var/lib/mynfs *(rw,async,all_squash)
export -a
exportfs -rv
systemctl restart nfs

#检查是否可用
showmount -e nfsServerIp
mount -t nfs nfsServerIp:/var/lib/mynfs /mnt

#测试可用就行，然后umount
umount /mnt

2，创建项目等基础资源

oc new-project lan
oc new-app --name=myapp --docker-image=URL --insecure-registry 

oc create -f pv.yml

#cat pv.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mypv
spec:
  capacity:
    storage: 1Gi 
  accessModes:
    - ReadWriteMany 
  persistentVolumeReclaimPolicy: Retain 
  nfs: 
    path:/var/lib/mynfs
    server: nfsServerIp
    readOnly: false

3，查看myapp的dc配置，获取volume值

oc get dc
oc describe dc dcName
#此处会输出我们需要绑定存储的目录名称，见下图mydc.jpg
#详情请见官网[https://docs.openshift.com/container-platform/3.5/dev_guide/app_tutorials/maven_tutorial.html](https://docs.openshift.com/container-platform/3.5/dev_guide/app_tutorials/maven_tutorial.html)

此处的name即是我们需要绑定存储的volume名称

mydc.jpg

4，给pod绑定存储

bash]  oc volumes dc myDcName --add --overwrite --name=volumeName -t pvc  \
--claim-name='yourName' 
--claim-mode='ReadWriteMany/ReadWriteOnce/ReadOnlyMany'  #三种类型可选
--claim-size=1Gi

5,查看是否生效

oc describe dc dcName