Question

我正在尝试在kubernetes中构建一个Pod，该Pod从本地系统中将文件安装到Pod，类似于在docker-compose文件中加载卷

我尝试了以下操作，试图将本地文件夹./test和文件安装到/blah/文件夹下的pod中。但是kubernetes抱怨MountVolume.SetUp failed for volume "config-volume" : hostPath type check failed: ./test/ is not a directory

这是我的yaml文件。我想念什么吗？

kind: Service
metadata:
  name: vol-test
  labels:
    app: vol-test
spec:
  type: NodePort
  ports:
    - port: 8200
      nodePort: 30008
  selector:
    app: vol-test

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: vol-test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: vol-test
  template:
    metadata:
      labels:
        app: vol-test
    spec:
      containers:
        - name: vol-test
          image: nginx
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: config-volume
              mountPath: /blah/
          ports:
            - containerPort: 8200
      volumes:
        - name: config-volume
          hostPath:
            path: ./test/
            type: Directory

Answer 1

如果您只是想将文件或目录传递给Pod以便读取配置值（我认为是您选择的卷装载config-volume），而无需更新文件/目录，那么您只需将文件放入ConfigMap中即可，如下所示：

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-router-config
data:
  nginx.conf: |
    worker_processes 2;
    user nginx;
    events {
        worker_connections  1024;
    }

    http {
        include       mime.types;
        charset       utf-8;
        client_max_body_size 8M;

        server {
            server_name _;
            listen 80 default_server;

            location / {
                proxy_set_header Host $host;
                proxy_set_header X-Forwarded-Host $host;
                proxy_set_header X-Forwarded-Proto https;
                proxy_pass http://drupal:80/ ;
                proxy_redirect default;
            }

            location /api/ {
                proxy_pass http://api-gateway:8080/ ;
                proxy_redirect default;
            }
        }
    }

或者您可以从运行kubectl命令并执行的位置导入文件内容（假设文件名为nginx.conf）

kubectl create configmap nginx-router-config --from-file=nginx.conf

然后，您可以通过在部署规范中添加volumes和volumeMount来挂载文件：

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: nginx-router
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nginx-router-config
          mountPath: /etc/nginx/nginx.conf
          subPath: nginx.conf
      volumes:
        - name: nginx-router-config
          configMap:
            name: nginx-router-config
            items:
              - key: nginx.conf
                path: nginx.conf

如果您确实想对文件具有读写访问权限，则可以按照其他答案的建议使用PersistentVolume和PersistentVolumeClaim，尽管如果您有多个，我不建议使用hostPath工作节点。

Answer 2

您可以这样做

kind: PersistentVolume
apiVersion: v1
metadata:
  name: config-volume-pv
  labels:
    type: local
spec:
  storageClassName: generic
  capacity:
    storage: 100Mi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/path/to/volume"

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  creationTimestamp: null
  name: config-volume-pvc
spec:
  storageClassName: generic
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 100Mi
status: {}

---
kind: Service
metadata:
  name: vol-test
  labels:
    app: vol-test
spec:
  type: NodePort
  ports:
    - port: 8200
      nodePort: 30008
  selector:
    app: vol-test

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: vol-test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: vol-test
  template:
    metadata:
      labels:
        app: vol-test
    spec:
      containers:
        - name: vol-test
          image: nginx
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
          - mountPath: /blah/
            name: ng-data
          ports:
            - containerPort: 8200
      volumes:
      - name: ng-data
        persistentVolumeClaim:
          claimName: config-volume-pvc

Answer 3

诸如“服务”，“部署”之类的工作负载资源无法将卷装载到Pod中不存在的文件夹中。

确保在挂载之前已在窗格中创建文件夹。最好的方法是，如果您要创建自己的映像，则在docker文件中定义一个this，或者在pod的开头具有一个脚本来创建所需的文件夹。

Answer 4

如果您想从主机添加本地文件，那么以下将起作用

apiVersion: v1
kind: Pod
metadata:
  name: test-webserver
spec:
  containers:
  - name: test-webserver
    image: k8s.gcr.io/test-webserver:latest
    volumeMounts:
    - mountPath: /var/local/aaa/1.txt
      name: myfile
      readOnly: true
  volumes:
  - name: myfile
    hostPath:
      path: /var/local/aaa/1.txt
      type: File

kubernetes将本地文件添加到pod

4 个答案: