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1 hostPath 卷介绍 2 hostPath 卷实际应用操作 2.1 创建 pod 资源类型 2.2 修改清单文件增加 hostPath 对应的参数配置 2.3 查看是否创建 卷 和 pod 2.4 创建发布文件测试是否正常访问 1 hostPath 卷介绍
EmptyDir中数据不会被持久化#xff0c;它会随着Pod的结束而销…目录
1 hostPath 卷介绍 2 hostPath 卷实际应用操作 2.1 创建 pod 资源类型 2.2 修改清单文件增加 hostPath 对应的参数配置 2.3 查看是否创建 卷 和 pod 2.4 创建发布文件测试是否正常访问 1 hostPath 卷介绍
EmptyDir中数据不会被持久化它会随着Pod的结束而销毁如果想简单的将数据持久化到主机中可以选择HostPath。
HostPath就是将Node主机中一个实际目录挂在到Pod中以供容器使用这样的设计就可以保证Pod销毁了但是数据依据可以存在于Node主机上。 2 hostPath 卷实际应用操作
2.1 创建 pod 资源类型
[rootk8s-master volumes]# kubectl run hostpath \
--image nginx:latest --port 80 \
--dry-runclient -o yaml hostpath.yml2.2 修改清单文件增加 hostPath 对应的参数配置
[rootk8s-master volumes]# vim hostpath.yml apiVersion: v1
kind: Pod
metadata:labels:run: hostpathname: hostpath
spec:volumes:# 定义一个名为 cache-vol 的 hostPath 卷# hostPath 类型的卷将主机文件系统的指定路径直接挂载到 Pod 中- name: cache-volhostPath:path: /data # 主机上的路径type: DirectoryOrCreate # 指定路径类型如果不存在则创建目录containers:# 容器 nginx-host- image: nginx:latestname: nginx-hostvolumeMounts:# 将 cache-vol 卷挂载到容器内的 /usr/share/nginx/html 路径# 这样容器可以访问主机上的 /data 目录- mountPath: /usr/share/nginx/htmlname: cache-volports:- containerPort: 80 # 容器内部监听的端口关于 spec.volumes.hostPath.type 的值的一点说明 DirectoryOrCreate 目录存在就使用不存在就先创建后使用 Directory 目录必须存在 FileOrCreate 文件存在就使用不存在就先创建后使用 File 文件必须存在 Socket unix套接字必须存在 CharDevice 字符设备必须存在 BlockDevice 块设备必须存在
2.3 查看是否创建 卷 和 pod
[rootk8s-master volumes]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
hostpath 1/1 Running 0 59s 10.244.2.63 k8s-node2 none none
nginx-v1-dbd4bc45b-49hhw 1/1 Running 0 3d18h 10.244.2.54 k8s-node2 none none
nginx-v2-bd85b8bc4-nqpv2 1/1 Running 0 3d18h 10.244.1.35 k8s-node1 none none
testpod 0/1 Completed 0 3d5h 10.244.2.58 k8s-node2 none none[rootk8s-master volumes]# kubectl describe pod hostpath
Name: hostpath
Namespace: default
Priority: 0
Service Account: default
Node: k8s-node2/192.168.239.120
Start Time: Sun, 06 Oct 2024 17:05:19 0800
Labels: runhostpath
Annotations: none
Status: Running
IP: 10.244.2.63
IPs:IP: 10.244.2.63
Containers:nginx-host:Container ID: docker://416d1c3dfe66633c1c23519ddaa65f77d8157127c3583a79b47e57eca5913756Image: nginx:latestImage ID: docker-pullable://nginxsha256:127262f8c4c716652d0e7863bba3b8c45bc9214a57d13786c854272102f7c945Port: 80/TCPHost Port: 0/TCPState: RunningStarted: Sun, 06 Oct 2024 17:05:20 0800Ready: TrueRestart Count: 0Environment: noneMounts:/usr/share/nginx/html from cache-vol (rw)/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-64rsp (ro)
Conditions:Type StatusPodReadyToStartContainers True Initialized True Ready True ContainersReady True PodScheduled True
Volumes:cache-vol:Type: HostPath (bare host directory volume)Path: /dataHostPathType: DirectoryOrCreatekube-api-access-64rsp:Type: Projected (a volume that contains injected data from multiple sources)TokenExpirationSeconds: 3607ConfigMapName: kube-root-ca.crtConfigMapOptional: nilDownwardAPI: true
QoS Class: BestEffort
Node-Selectors: none
Tolerations: node.kubernetes.io/not-ready:NoExecute opExists for 300snode.kubernetes.io/unreachable:NoExecute opExists for 300s
Events:Type Reason Age From Message---- ------ ---- ---- -------Normal Scheduled 15m default-scheduler Successfully assigned default/hostpath to k8s-node2Normal Pulling 15m kubelet Pulling image nginx:latestNormal Pulled 15m kubelet Successfully pulled image nginx:latest in 89ms (89ms including waiting). Image size: 187694648 bytes.Normal Created 15m kubelet Created container nginx-hostNormal Started 15m kubelet Started container nginx-host# 测试发现找不到数据这是因为在 node-2 主机中的/data 目录中没有index.html
[rootk8s-master volumes]# curl 10.244.2.63
html
headtitle403 Forbidden/title/head
body
centerh1403 Forbidden/h1/center
hrcenternginx/1.27.1/center
/body
/html
2.4 创建发布文件测试是否正常访问
# 查询 pod 调度到了哪台node上
[rootk8s-master volumes]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
hostpath 1/1 Running 0 59s 10.244.2.63 k8s-node2 none none
nginx-v1-dbd4bc45b-49hhw 1/1 Running 0 3d18h 10.244.2.54 k8s-node2 none none
nginx-v2-bd85b8bc4-nqpv2 1/1 Running 0 3d18h 10.244.1.35 k8s-node1 none none
testpod 0/1 Completed 0 3d5h 10.244.2.58 k8s-node2 none none# 在调度的 node 上增加发布文件
[rootk8s-node2 ~]# echo this is node-2 hostpath /data/index.html# 访问 pod 测试
[rootk8s-master volumes]# curl 10.244.2.63
this is node-2 hostpath
