“Kubernetes集群管理员通过提供不同的存储类，可以满足用户不同的服务质量级别、备份策略和任意策略要求的存储需求。动态存储卷供应使用StorageClass进行实现，其允许存储卷按需被创建。本文将提供在Rancher环境中实现基于NFS的动态存储的方法。”
1. NFS Server安装
1.1 Ubuntu下安装nfs server
- 安装 nfs server 端应用
$ sudo apt-get update
$ sudo apt-get install -y nfs-kernel-server
- 配置nfs
配置 nfs 目录和读写权限相关配置。
$ cd ~
$ mkdir nfs
$ sudo vi /etc/exports
将下列内容添加进最后一行：
/opt/data/k8s *(rw,sync,no_root_squash,no_subtree_check)
- 启动服务
$ sudo /etc/init.d/rpcbind restart
$ sudo /etc/init.d/nfs-kernel-server restart
1.2 在其他服务器进行挂载验证
$ sudo apt-get install -y nfs-common
$ showmount -e 192.168.2.42
$ sudo mount -t nfs 192.168.2.42:/opt/data/k8s /mnt
$ sudo umount /mnt
2. Rancher中配置NFS存储
配置NFS作为动态存储分配将使用kubernetes存储插件NFS-Client Provisioner。
2.1 ServiceAccount配置
kind: ServiceAccount
apiVersion: v1
metadata:
name: nfs-client-provisioner
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: nfs-client-provisioner-runner
rules:
- apiGroups: [""]
resources: ["persistentvolumes"]
verbs: ["get", "list", "watch", "create", "delete"]
- apiGroups: [""]
resources: ["persistentvolumeclaims"]
verbs: ["get", "list", "watch", "update"]
- apiGroups: ["storage.k8s.io"]
resources: ["storageclasses"]
verbs: ["get", "list", "watch"]
- apiGroups: [""]
resources: ["events"]
verbs: ["list", "watch", "create", "update", "patch"]
- apiGroups: [""]
resources: ["endpoints"]
verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: run-nfs-client-provisioner
subjects:
- kind: ServiceAccount
name: nfs-client-provisioner
namespace: default
roleRef:
kind: ClusterRole
name: nfs-client-provisioner-runner
apiGroup: rbac.authorization.k8s.io
2.2 nfs-client-provisioner配置
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: nfs-client-provisioner
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
labels:
app: nfs-client-provisioner
spec:
serviceAccountName: nfs-client-provisioner
containers:
- name: nfs-client-provisioner
# image: quay.io/external_storage/nfs-client-provisioner:latest
image: quay.io/external_storage/nfs-client-provisioner:v2.1.2-k8s1.11
# image: quay.io/external_storage/nfs-client-provisioner:v2.0.1
volumeMounts:
- name: nfs-client-root
mountPath: /persistentvolumes
env:
- name: PROVISIONER_NAME
value: nfs-client-provisioner
# value: fuseim.pri/ifs
- name: NFS_SERVER
value: 192.168.2.42
- name: NFS_PATH
value: /opt/data/k8s
volumes:
- name: nfs-client-root
nfs:
server: 192.168.2.42
path: /opt/data/k8s
---
2.3 StorageClass配置
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: nfs-storage
provisioner: nfs-client-provisioner
2.4 PersistentVolume测试配置
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: test-claim
annotations:
storage-class: "nfs-storage"
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 1Mi
storageClassName: nfs-storage
---
kind: Pod
apiVersion: v1
metadata:
name: test-pod
spec:
containers:
- name: test-pod
image: busybox
command:
- "/bin/sh"
args:
- "-c"
- "touch /mnt/SUCCESS && exit 0 || exit 1"
volumeMounts:
- name: nfs-pvc
mountPath: "/mnt"
restartPolicy: "Never"
volumes:
- name: nfs-pvc
persistentVolumeClaim:
claimName: test-claim