Question

将ConfigMap用作挂载卷时，将删除Pod挂载位置内的所有现有文件和文件夹。

使用以下命令创建ConfigMap：

where

部署yaml文件：

$ kubectl create configmap tomcat-configmap --from-file=./config/tomcat-config.xml

我尝试了不同的配置，但没有成功：（

任何建议都会很有帮助

我正在使用Windows的docker提供的kubernetes：

kind: Service
apiVersion: v1
metadata:
  name: tomcat-svc
spec:
  selector:
    app: tomcat-container
  ports:
  - protocol: TCP
    port: 83
    targetPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
spec:
  selector:
    matchLabels:
      app: tomcat-container
  replicas: 1
  template:
    metadata:
      labels:
        app: tomcat-container
    spec:
      containers:
      - name: tomcat
        image: bitnami/tomcat:latest
        ports:
        - containerPort: 8080
        volumeMounts:
        - name: tomcat-configmap-volume
          mountPath: /usr/local/tomcat/webapps/examples/WEB-INF/classes/com/test/app-conf.xml
          subPath: app-conf.xml
      volumes:
        - name: tomcat-configmap-volume
          configMap:
            name: tomcat-configmap

Answer 1

这里的问题是，您正在使用subPath，并且它是一个目录，并且您认为app-conf.xml应该作为文件创建。

您真正想要的就是这个：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
spec:
  selector:
    matchLabels:
      app: tomcat-container
  replicas: 1
  template:
    metadata:
      labels:
        app: tomcat-container
    spec:
      containers:
      - name: tomcat
        image: bitnami/tomcat:latest
        ports:
        - containerPort: 8080
        volumeMounts:
        - name: tomcat-configmap-volume
          mountPath: /usr/local/tomcat/webapps/examples/WEB-INF/classes/com/test
      volumes:
        - name: tomcat-configmap-volume
          configMap:
            name: tomcat-configmap

并命名文件app-conf.xml，以便在创建ConfigMap时在ConfigMap本身中为其分配一个data键app-conf.xml：

$ kubectl create configmap tomcat-configmap --from-file=./app-conf.xml

然后您的ConfigMap将如下所示：

$ kubectl describe cm tomcat-configmap
Name:         tomcat-configmap
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
app-conf.xml:
----
<xml>
...
...
</xml>

Events:  <none>

Answer 2

kind: Service
apiVersion: v1
metadata:
  name: tomcat-svc
spec:
  selector:
  app: tomcat-container
  ports:
  - protocol: TCP
    port: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
spec:
  selector:
    matchLabels:
      app: tomcat-container
  replicas: 1
  template:
    metadata:
      labels:
        app: tomcat-container
    spec:
  containers:
  - name: tomcat
    image: bitnami/tomcat:latest
    ports:
    - containerPort: 8080
    volumeMounts:
    - name: tomcat-configmap-volume
      mountPath: /usr/local/tomcat/webapps/examples/WEB-INF/classes/com/test
      #subPath: app-conf.xml
  volumes:
    - name: tomcat-configmap-volume
      configMap:
        name: tomcat-configmap

Rico上面提供的答案应该可行，无论如何，我在下面提供实施结果：

注释掉子路径，当您想覆盖现有的配置文件时，子路径非常有用。另外，您的tomcat路径在您使用的映像中为/ opt / bitnami / tomcat，并且您正在/ usr / local / tomcat /中的动态创建的自定义位置中装载文件，请确保您的意思是覆盖内容

kubernetes-Configmap-现有文件被删除

2 个答案: