Kubernetes创建挂载共享存储的容器

前言

本文介绍如何使用NFS来配置一个通过挂载共享存储的Nginx容器。

部署实践

环境说明

1 2	Kubernetes: v1.8版本 192.168.200.100 CentOS 7.4 NFS: 192.168.200.101 CentOS 7.4

Kubernetes集群部署

略

NFS部署

Server端

# yum install rpcbind nfs-utils -y
# mkdir -p /data/www-data
# cat >/etc/exports<<-EOF
/data/www-data  192.168.200.0/24(rw,sync)
EOF
# systemctl start nfs
# systemctl enable nfs
# echo "k8s" >> /data/www-data/index.html   # 创建测试文件

Client端

1
2
3

# yum install nfs-utils -y
# showmount -e node1                 # 显示共享目录
# mount node1:/data/www-data /mnt    # 测试挂载

1、配置参数可以根据线上环境调整
2、所有Kubernetes node节点必须按照client按照客户端，理解PV\PVC使用原理

创建PV

# cat pv-nfs.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0001
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: node1
    path: "/data/www-data"
[root@master k8s]# kubectl create -f pv-nfs.yml --record
persistentvolume "pv0001" created
[root@master k8s]# kubectl get pv
NAME      CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM     STORAGECLASS   REASON    AGE
pv0001    5Gi        RWO            Retain           Available                                      27s

创建PVC

[root@master k8s]# cat pvc.yml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: myclaim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
[root@master k8s]# kubectl create -f pvc.yml --record
persistentvolumeclaim "myclaim" created
[root@master k8s]# kubectl get pvc
NAME      STATUS    VOLUME    CAPACITY   ACCESS MODES   STORAGECLASS   AGE
myclaim   Bound     pv0001    5Gi        RWO                           5s

创建Nginx deployment

[root@master k8s]# cat nginx-deployment-pvc.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-deployment-pvc
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
        track: stable
    spec:
      containers:
      - name: nginx
        image: gtest.com/k8s/nginx:1.10
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: "/usr/share/nginx/html"
          name: nginx-storage
      volumes:
      - name: nginx-storage
        persistentVolumeClaim:
          claimName: myclaim
[root@master k8s]# kubectl get pod -o wide
NAME                                    READY     STATUS    RESTARTS   AGE       IP               NODE
nginx-deployment-pvc-789584787d-c2npz   1/1       Running   0          2m        172.20.166.139   192.168.200.101
nginx-deployment-pvc-789584787d-cc7td   1/1       Running   0          2m        172.20.104.9     192.168.200.102
nginx-deployment-pvc-789584787d-j9zdx   1/1       Running   0          2m        172.20.104.10    192.168.200.102

创建Nginx Service

[root@master k8s]# cat nginx-svc.yml
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  type: NodePort
  ports:
    - port: 80
      nodePort: 32000
  selector:
    app: nginx
[root@master k8s]# kubectl create -f nginx-svc.yml --record
service "nginx-svc" created
[root@master k8s]# kubectl get service
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.68.0.1       <none>        443/TCP        5h
nginx-svc    NodePort    10.68.133.178   <none>        80:32000/TCP   14s
[root@master k8s]# kubectl get endpoints nginx-svc
NAME        ENDPOINTS                                           AGE
nginx-svc   172.20.166.139:80,172.20.104.9:80,172.20.104.10:80   33s