Kubernetes部分Volume类型介绍及yaml示例--NFS（网络数据卷）

1. 说明 nfs 卷允许将现有的 NFS（网络文件系统）共享挂载到你的容器中。不像 emptyDir，当删除 Pod 时，nfs 卷的内容被保留，卷仅仅是被卸载。这意味着 NFS 卷可以预填充数据，并且可以在 pod 之间“切换”数据。 NFS 可以被多个写入者同时挂载。
2. 部署NFS服务器 关于NFS的部署，请参考NFS部署及优化（一）
3. 实战pod内的文件共享

#创建yaml文件
cat >> nginx_volume.yaml << EOF
apiVersion: v1
kind: Pod
metadata:
		name: nginx-test
		namespace: test
		labels:
			app: nginx
spec:
		containers:
		- name: nginx
			image: nginx:1.7.9
			ports:
			- containerPort: 80
			volumeMounts:
			#Mount the path to the container
			- mountPath: "/tmp/"
				name: pv0003
		volumes:
		- name: pv0003
			nfs:
			  #fixed：This ip is the address of the nfs server
				server: 192.168.246.169
				#fixed：This path is shared externally by the nfs server
				path: "/data"

#启动nginx_volume.yaml
kubectl create -f ./nginx_volume.yaml 

#查看Pod运行状态
kubectl get po -n test
NAME                         READY     STATUS    RESTARTS   AGE
nginx-test                   1/1       Running   0          29s

#进入容器查看共享卷volume
kubectl exec -it nginx-test  /bin/bash --namespace=test
root@nginx-test:/# cd tmp
root@nginx-test:/tmp# ls
lost+found  sys
##我们可以看到NFS服务器共享卷/data已经挂载进来了

1. 实战多个Pod内的容器间共享

#创建deployment
cat >> deploy_volume.yaml << EOF
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
		name: nginx-wtf
		namespace: test
spec:
		replicas: 2
		template:
			metadata:
				labels:
					app: wtf
			spec:
				containers:
				- name: nginx-wtf
					image: nginx:1.7.9
					ports:
					- containerPort: 81
					volumeMounts:
					 - name: pv0003
						 mountPath: /tmp/
				volumes:
				- name: pv0003
					nfs:
						server: 192.168.246.169
						path: "/data/"

#启动deployment
kubectl create -f ./deploy_volume.yaml

#查看Pods的运行状态
NAME                         READY     STATUS    RESTARTS   AGE
nginx-wtf-5774b87bdc-n97gr   1/1       Running   0          32m
nginx-wtf-5774b87bdc-xpsnr   1/1       Running   0          32m

#进入容器查看共享卷volume
kubectl exec -it nginx-wtf-5774b87bdc-n97gr  /bin/bash --namespace=test
root@nginx-wtf-5774b87bdc-n97gr:/# cd tmp
root@nginx-wtf-5774b87bdc-n97gr:/tmp# ls
lost+found  sys

1. 实战volume的操作

#查看下当前命名空间运行有挂载NFS卷的Pods
kubectl get po -n test
NAME                         READY     STATUS    RESTARTS   AGE
nginx-test                   1/1       Running   0          2m
nginx-wtf-5774b87bdc-n97gr   1/1       Running   0          36m
nginx-wtf-5774b87bdc-xpsnr   1/1       Running   0          36m
##在命名空间test里运行有三个Pods

#在NFS服务端对共享卷进行操作
##创建目录datagrand
mkdir /data/datagrand

#查看各Pod中容器内卷的变化
##nginx-test
kubectl exec -it nginx-test  /bin/bash --namespace=test
root@nginx-test:/# cd tmp
root@nginx-test:/tmp# ls
datagrand  lost+found  sys
##nginx-wtf-5774b87bdc-n97gr
kubectl exec -it nginx-wtf-5774b87bdc-n97gr  /bin/bash --namespace=test
root@nginx-wtf-5774b87bdc-n97gr:/# cd tmp
root@nginx-wtf-5774b87bdc-n97gr:/tmp# ls
datagrand  lost+found  sys
##nginx-wtf-5774b87bdc-xpsnr
kubectl exec -it nginx-wtf-5774b87bdc-xpsnr  /bin/bash --namespace=test
root@nginx-wtf-5774b87bdc-xpsnr:/# cd tmp
root@nginx-wtf-5774b87bdc-xpsnr:/tmp# ls
datagrand  lost+found  sys
##说明：我们可以看到各Pod中容器内卷已有datagrand