我有两个副本的简单部署。
我希望每个副本中都具有相同的存储文件夹(共享应用程序上载文件夹)
我一直在处理理赔和数量问题,但还没有取得什么进展,因此寻求快速帮助/示例。
apiVersion: apps/v1
kind: Deployment
metadata:
name: 'test-tomcat'
labels:
app: test-tomcat
spec:
selector:
matchLabels:
app: test-tomcat
replicas: 3
template:
metadata:
name: 'test-tomcat'
labels:
app: test-tomcat
spec:
volumes:
- name: 'data'
persistentVolumeClaim:
claimName: claim
containers:
- image: 'tomcat:9-alpine'
volumeMounts:
- name: 'data'
mountPath: '/app/data'
imagePullPolicy: Always
name: 'tomcat'
command: ['bin/catalina.sh', 'jpda', 'run']
kind: PersistentVolume
apiVersion: v1
metadata:
name: volume
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 2Gi
accessModes:
- ReadWriteMany
hostPath:
path: "/mnt/data"
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: claim
spec:
storageClassName: manual
accessModes:
- ReadWriteMany
resources:
requests:
storage: 1Gi
答案 0 :(得分:7)
首先,您需要确定要使用哪种类型的持久卷。以下是本地群集的几个示例:
HostPath -节点上的本地路径。因此,如果第一个Pod位于Node1上,第二个Pod位于Node2上,则存储空间将不同。要解决此问题,可以使用以下选项之一。 HostPath示例:
kind: PersistentVolume
apiVersion: v1
metadata:
name: example-pv
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 3Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
NFS -该类型的PersistentVolume使用网络文件系统。 NFS是一种分布式文件系统协议,使您可以在服务器上安装远程目录。在Kubernetes中使用NFS之前,您需要安装NFS服务器。这是示例How To Set Up an NFS Mount on Ubuntu。 Kubernetes中的示例:
apiVersion: v1
kind: PersistentVolume
metadata:
name: example-pv
spec:
capacity:
storage: 3Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: slow
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: /tmp
server: 172.17.0.2
GlusterFS -GlusterFS是可扩展的分布式文件系统,它将来自多个服务器的磁盘存储资源聚合到单个全局名称空间中。至于NFS,您需要先安装GlusterFS才能在Kubernetes中使用它;这里是link和说明,另外one和示例。 Kubernetes中的示例:
apiVersion: v1
kind: PersistentVolume
metadata:
name: example-pv
annotations:
pv.beta.kubernetes.io/gid: "590"
spec:
capacity:
storage: 3Gi
accessModes:
- ReadWriteMany
glusterfs:
endpoints: glusterfs-cluster
path: myVol1
readOnly: false
persistentVolumeReclaimPolicy: Retain
---
apiVersion: v1
kind: Service
metadata:
name: glusterfs-cluster
spec:
ports:
- port: 1
---
apiVersion: v1
kind: Endpoints
metadata:
name: glusterfs-cluster
subsets:
- addresses:
- ip: 192.168.122.221
ports:
- port: 1
- addresses:
- ip: 192.168.122.222
ports:
- port: 1
- addresses:
- ip: 192.168.122.223
ports:
- port: 1
创建PersistentVolume之后,需要创建一个PersistaentVolumeClaim。 PersistaentVolumeClaim是Pod用来从存储中请求卷的资源。创建PersistentVolumeClaim后,Kubernetes控制平面会寻找一个符合声明要求的PersistentVolume。示例:
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: example-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi
最后一步,您需要配置一个Pod以使用PersistentVolumeClaim。这是示例:
apiVersion: apps/v1
kind: Deployment
metadata:
name: 'test-tomcat'
labels:
app: test-tomcat
spec:
selector:
matchLabels:
app: test-tomcat
replicas: 3
template:
metadata:
name: 'test-tomcat'
labels:
app: test-tomcat
spec:
volumes:
- name: 'data'
persistentVolumeClaim:
claimName: example-pv-claim #name of the claim should be the same as defined before
containers:
- image: 'tomcat:9-alpine'
volumeMounts:
- name: 'data'
mountPath: '/app/data'
imagePullPolicy: Always
name: 'tomcat'
command: ['bin/catalina.sh', 'jpda', 'run']