在 Kubernetes 中挂载 hostPath 的问题

Question

好的，我正在尝试在 kubernetes 的 minikube 中设置 Jenkins 容器的本地版本，并且我使用 this guide 作为模型。

我遇到的问题是 hostPath 似乎没有正确安装。

当我尝试在不使用“persistentVolumeClaim”的情况下挂载主机路径时 我的代码如下所示：

deployment_jenkins.yaml

apiVersion: extensions/v1beta1

kind: Deployment
metadata:
  name: jenkins
  namespace: jenkins
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: master
    spec:
      containers:
      - name: master
        image: jenkins:2.7.2
        ports:
        - containerPort: 8080
        - containerPort: 50000
        readinessProbe:
          httpGet:
            path: /login
            port: 8080
          periodSeconds: 10
          timeoutSeconds: 5
          successThreshold: 2
          failureThreshold: 5
        env:
        - name: JENKINS_OPTS
          valueFrom:
            secretKeyRef:
              name: jenkins
              key: options
        volumeMounts:
        - mountPath: /var/jenkins_home
          name: jenkins-home
        resources:
          limits:
            cpu: 500m
            memory: 1500Mi
          requests:
            cpu: 500m
            memory: 1500Mi
      volumes:
      - name: jenkins-home
      hostPath:
        path: /data

当我运行 kubectl apply -f deployment_jenkins.yaml 时出现此错误：

my-mac kubernetes $ kubectl apply -f deployment_jenkins.yaml
error: error validating "deployment_jenkins.yaml": error validating data: 
found invalid field hostPath for v1.PodSpec; if you choose to ignore these 
errors, turn validation off with --validate=false

然后当我尝试使用声明时，我得到了这个：

persistent_volume_claim_jenkins.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: jenkins-home-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  volumeName: jenkins-home

persistent_volume_jenkins.yaml

kind: PersistentVolume
apiVersion: v1
metadata:
  name: jenkins-home
spec:
  accessModes:
    - ReadWriteOnce
  capacity:
    storage: 5Gi
  hostPath:
    path: /data

deployment_jenkins.yaml

apiVersion: extensions/v1beta1

kind: Deployment
metadata:
  name: jenkins
  namespace: jenkins
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: master
    spec:
      containers:
      - name: master
        image: jenkins:2.7.2
        ports:
        - containerPort: 8080
        - containerPort: 50000
        readinessProbe:
          httpGet:
            path: /login
            port: 8080
          periodSeconds: 10
          timeoutSeconds: 5
          successThreshold: 2
          failureThreshold: 5
        env:
        - name: JENKINS_OPTS
          valueFrom:
            secretKeyRef:
              name: jenkins
              key: options
        volumeMounts:
        - mountPath: /var/jenkins_home
          name: jenkins-home
        resources:
          limits:
            cpu: 500m
            memory: 1500Mi
      requests:
        cpu: 500m
        memory: 1500Mi
      volumes:
      - name: jenkins-home
        persistentVolumeClaim:
          claimName: jenkins-home-claim

然后我运行命令：

my-mac kubernetes $ kubectl apply -f .
deployment "jenkins" configured
persistentvolumeclaim "jenkins-home-claim" configured
persistentvolume "jenkins-home" configured

最终，我的 pod 从未启动，我在仪表板中收到以下错误：

我非常困惑，如果能帮助我弄清楚我做错了什么以及如何让它发挥作用，我将不胜感激。

Answer 1

您的某些 yaml 缩进错误，导致不同的（损坏的）解释：

volumes: - name: jenkins-home hostPath: path: /data

这是一个具有两个字段的对象，volumes 和 hostPath。相反，您想要的是：

volumes: - name: jenkins-home hostPath: path: /data

另外，我建议您始终在 yaml 中引用（非块）字符串以避免意外：

volumes: - name: 'jenkins-home' hostPath: path: '/data'