使用NFS作为k8s的持久化存储
来源：原创
时间：2020-06-25
作者：脚本小站
分类：Linux
nfs-subdir-external-provisioner
先在任意主机上创建好nfs服务，然后在k8s中部署如下几个资源，这里用到的是nfs-client-provisioner，官方文档如下：
https://github.com/kubernetes-retired/external-storage/tree/master/nfs-client
新地址：
https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner
需要部署的几个文件：
nfs-storageclass.yaml
apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: managed-nfs-storage provisioner: fuseim.pri/ifs # or choose another name, must match deployment's env PROVISIONER_NAME' parameters: archiveOnDelete: "false"
rbac.yaml
apiVersion: v1 kind: ServiceAccount metadata: name: nfs-client-provisioner # replace with namespace where provisioner is deployed namespace: default --- 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: ["create", "update", "patch"] --- kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata: name: run-nfs-client-provisioner subjects: - kind: ServiceAccount name: nfs-client-provisioner # replace with namespace where provisioner is deployed namespace: default roleRef: kind: ClusterRole name: nfs-client-provisioner-runner apiGroup: rbac.authorization.k8s.io --- kind: Role apiVersion: rbac.authorization.k8s.io/v1 metadata: name: leader-locking-nfs-client-provisioner # replace with namespace where provisioner is deployed namespace: default rules: - apiGroups: [""] resources: ["endpoints"] verbs: ["get", "list", "watch", "create", "update", "patch"] --- kind: RoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata: name: leader-locking-nfs-client-provisioner # replace with namespace where provisioner is deployed namespace: default subjects: - kind: ServiceAccount name: nfs-client-provisioner # replace with namespace where provisioner is deployed namespace: default roleRef: kind: Role name: leader-locking-nfs-client-provisioner apiGroup: rbac.authorization.k8s.io
deployment.yaml：注意修改nfs服务地址和目录
apiVersion: apps/v1 kind: Deployment metadata: name: nfs-client-provisioner labels: app: nfs-client-provisioner # replace with namespace where provisioner is deployed namespace: default spec: replicas: 1 strategy: type: Recreate selector: matchLabels: app: nfs-client-provisioner 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 volumeMounts: - name: nfs-client-root mountPath: /persistentvolumes env: - name: PROVISIONER_NAME value: fuseim.pri/ifs # 如果有多个storageclass和多个nfs这里的值要不一样 - name: NFS_SERVER value: 192.168.0.71 - name: NFS_PATH value: /opt/nfs volumes: - name: nfs-client-root nfs: server: 192.168.0.71 path: /opt/nfs
注意：
在k8s 1.21之后的版本中使用nfs需要在kube-apiserver.yaml中添加如下参数，selfLink功能在这个版本之后被移除了，会导致pv创建不了。
spec: containers: - command: - kube-apiserver - --feature-gates=RemoveSelfLink=false # 添加这个
或者使用如下不依赖selfLink功能的镜像：这样就不用在apiserver中添加参数了
gcr.io/k8s-staging-sig-storage/nfs-subdir-external-provisioner:v4.0.0 registry.cn-beijing.aliyuncs.com/pylixm/nfs-subdir-external-provisioner:v4.0.0
csi-driver-nfs
github地址：
https://github.com/kubernetes-csi/csi-driver-nfs
k8s1.8版本可以使用3.1.0版本的，4.0+版本需要fsGroupPolicy，fsGroupPolicy功能是 Kubernetes 1.20 的 Beta 版才有的，默认禁用，而且需要手动开启，这里使用3.1版本的。
安装文档：
https://github.com/kubernetes-csi/csi-driver-nfs/blob/master/docs/install-csi-driver-v3.1.0.md
资源文件：或者直接应用资源文件即可。
kind: Deployment
apiVersion: apps/v1
metadata:
name: csi-nfs-controller
namespace: kube-system
spec:
replicas: 2
selector:
matchLabels:
app: csi-nfs-controller
template:
metadata:
labels:
app: csi-nfs-controller
spec:
hostNetwork: true # controller also needs to mount nfs to create dir
dnsPolicy: ClusterFirstWithHostNet
serviceAccountName: csi-nfs-controller-sa
nodeSelector:
kubernetes.io/os: linux # add "kubernetes.io/role: master" to run controller on master node
priorityClassName: system-cluster-critical
tolerations:
- key: "node-role.kubernetes.io/master"
operator: "Exists"
effect: "NoSchedule"
- key: "node-role.kubernetes.io/controlplane"
operator: "Exists"
effect: "NoSchedule"
containers:
- name: csi-provisioner
image: registry.k8s.io/sig-storage/csi-provisioner:v2.2.2
args:
- "-v=2"
- "--csi-address=$(ADDRESS)"
- "--leader-election"
env:
- name: ADDRESS
value: /csi/csi.sock
volumeMounts:
- mountPath: /csi
name: socket-dir
resources:
limits:
memory: 400Mi
requests:
cpu: 10m
memory: 20Mi
- name: liveness-probe
image: registry.k8s.io/sig-storage/livenessprobe:v2.5.0
args:
- --csi-address=/csi/csi.sock
- --probe-timeout=3s
- --health-port=29652
- --v=2
volumeMounts:
- name: socket-dir
mountPath: /csi
resources:
limits:
memory: 100Mi
requests:
cpu: 10m
memory: 20Mi
- name: nfs
image: registry.k8s.io/sig-storage/nfsplugin:v3.1.0
securityContext:
privileged: true
capabilities:
add: ["SYS_ADMIN"]
allowPrivilegeEscalation: true
imagePullPolicy: IfNotPresent
args:
- "-v=5"
- "--nodeid=$(NODE_ID)"
- "--endpoint=$(CSI_ENDPOINT)"
env:
- name: NODE_ID
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: CSI_ENDPOINT
value: unix:///csi/csi.sock
ports:
- containerPort: 29652
name: healthz
protocol: TCP
livenessProbe:
failureThreshold: 5
httpGet:
path: /healthz
port: healthz
initialDelaySeconds: 30
timeoutSeconds: 10
periodSeconds: 30
volumeMounts:
- name: pods-mount-dir
mountPath: /var/lib/kubelet/pods
mountPropagation: "Bidirectional"
- mountPath: /csi
name: socket-dir
resources:
limits:
memory: 200Mi
requests:
cpu: 10m
memory: 20Mi
volumes:
- name: pods-mount-dir
hostPath:
path: /var/lib/kubelet/pods
type: Directory
- name: socket-dir
emptyDir: {}
---
apiVersion: storage.k8s.io/v1
kind: CSIDriver
metadata:
name: nfs.csi.k8s.io
spec:
attachRequired: false
volumeLifecycleModes:
- Persistent
- Ephemeral
---
# This YAML file contains driver-registrar & csi driver nodeplugin API objects
# that are necessary to run CSI nodeplugin for nfs
kind: DaemonSet
apiVersion: apps/v1
metadata:
name: csi-nfs-node
namespace: kube-system
spec:
updateStrategy:
rollingUpdate:
maxUnavailable: 1
type: RollingUpdate
selector:
matchLabels:
app: csi-nfs-node
template:
metadata:
labels:
app: csi-nfs-node
spec:
hostNetwork: true # original nfs connection would be broken without hostNetwork setting
dnsPolicy: ClusterFirstWithHostNet
nodeSelector:
kubernetes.io/os: linux
tolerations:
- operator: "Exists"
containers:
- name: liveness-probe
image: registry.k8s.io/sig-storage/livenessprobe:v2.5.0
args:
- --csi-address=/csi/csi.sock
- --probe-timeout=3s
- --health-port=29653
- --v=2
volumeMounts:
- name: socket-dir
mountPath: /csi
resources:
limits:
memory: 100Mi
requests:
cpu: 10m
memory: 20Mi
- name: node-driver-registrar
image: registry.k8s.io/sig-storage/csi-node-driver-registrar:v2.4.0
args:
- --v=2
- --csi-address=/csi/csi.sock
- --kubelet-registration-path=$(DRIVER_REG_SOCK_PATH)
livenessProbe:
exec:
command:
- /csi-node-driver-registrar
- --kubelet-registration-path=$(DRIVER_REG_SOCK_PATH)
- --mode=kubelet-registration-probe
initialDelaySeconds: 30
timeoutSeconds: 15
env:
- name: DRIVER_REG_SOCK_PATH
value: /var/lib/kubelet/plugins/csi-nfsplugin/csi.sock
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
volumeMounts:
- name: socket-dir
mountPath: /csi
- name: registration-dir
mountPath: /registration
resources:
limits:
memory: 100Mi
requests:
cpu: 10m
memory: 20Mi
- name: nfs
securityContext:
privileged: true
capabilities:
add: ["SYS_ADMIN"]
allowPrivilegeEscalation: true
image: registry.k8s.io/sig-storage/nfsplugin:v3.1.0
args:
- "-v=5"
- "--nodeid=$(NODE_ID)"
- "--endpoint=$(CSI_ENDPOINT)"
env:
- name: NODE_ID
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: CSI_ENDPOINT
value: unix:///csi/csi.sock
ports:
- containerPort: 29653
name: healthz
protocol: TCP
livenessProbe:
failureThreshold: 5
httpGet:
path: /healthz
port: healthz
initialDelaySeconds: 30
timeoutSeconds: 10
periodSeconds: 30
imagePullPolicy: "IfNotPresent"
volumeMounts:
- name: socket-dir
mountPath: /csi
- name: pods-mount-dir
mountPath: /var/lib/kubelet/pods
mountPropagation: "Bidirectional"
resources:
limits:
memory: 300Mi
requests:
cpu: 10m
memory: 20Mi
volumes:
- name: socket-dir
hostPath:
path: /var/lib/kubelet/plugins/csi-nfsplugin
type: DirectoryOrCreate
- name: pods-mount-dir
hostPath:
path: /var/lib/kubelet/pods
type: Directory
- hostPath:
path: /var/lib/kubelet/plugins_registry
type: Directory
name: registration-dir
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: pvc-nfs-dynamic
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 10Gi
storageClassName: nfs-csi
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: csi-nfs-controller-sa
namespace: kube-system
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: nfs-external-provisioner-role
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: ["get", "list", "watch", "create", "update", "patch"]
- apiGroups: ["storage.k8s.io"]
resources: ["csinodes"]
verbs: ["get", "list", "watch"]
- apiGroups: [""]
resources: ["nodes"]
verbs: ["get", "list", "watch"]
- apiGroups: ["coordination.k8s.io"]
resources: ["leases"]
verbs: ["get", "list", "watch", "create", "update", "patch"]
- apiGroups: [""]
resources: ["secrets"]
verbs: ["get"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: nfs-csi-provisioner-binding
subjects:
- kind: ServiceAccount
name: csi-nfs-controller-sa
namespace: kube-system
roleRef:
kind: ClusterRole
name: nfs-external-provisioner-role
apiGroup: rbac.authorization.k8s.io
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: nfs-csi
provisioner: nfs.csi.k8s.io
parameters:
server: 192.168.1.80 # nfs地址
share: /data # nfs共享出来的目录
# csi.storage.k8s.io/provisioner-secret is only needed for providing mountOptions in DeleteVolume
# csi.storage.k8s.io/provisioner-secret-name: "mount-options"
# csi.storage.k8s.io/provisioner-secret-namespace: "default"
reclaimPolicy: Delete
volumeBindingMode: Immediate
mountOptions:
- nfsvers=4.1