如何在Kubernetes中使用卷挂载合并两个配置映射 [英] How to merge two configmaps using volume mount in kubernetes

问题描述

我有两个不同的配置映射 test-configmap 和 common-config .我试图将它们安装在同一位置，但是一个配置映射覆盖了另一个.然后我读到有关subPath的信息，但没有用.

I am having two different config maps test-configmap and common-config. I tried to mount them at the same location, but one config map overwrote the other. Then I read about subPath and did not work.

deploy.yaml

deploy.yaml

apiVersion: apps/v1beta1 # for versions before 1.8.0 use apps/v1beta1
kind: Deployment
metadata:
  name: testing
spec:
  replicas: 1
  template:
    metadata:
      name: testing
      labels:
        app: testing
    spec:
      containers:
      - name: testing-container
        image: testing
        imagePullPolicy: IfNotPresent
      ports:
      - containerPort: __PORT__
      volumeMounts:
      - name: commonconfig-volume
        mountPath: /usr/src/app/config/test.config
        subPath: test.config
    volumes:
      - name: commonconfig-volume
        configMap:
          name: test-configmap
      - name: commonconfig-volume
        configMap:
          name: common-config

错误:

The Deployment "testing" is invalid: spec.template.spec.volumes[1].name: Duplicate value: "commonconfig-volume"

我不确定是否可以合并两个配置映射.如果是的话，那我应该怎么做.

I am not sure if merging two config map achievable of not. And if yes then how should I do it.

推荐答案

您不能将两个ConfigMap安装到同一位置.

You cannot mount two ConfigMaps to the same location.

但是对于每个configmap中的每个项目都提及subPath和key，将使您可以从同一位置的两个configmap中获取项目.您必须手动为每个文件编写挂载点:

But mentioning subPath and key for every item in each configmaps will let you get items from both configmaps in the same location. You'll have to write mount points for each file manually:

apiVersion: v1
kind: Pod
metadata:
  name: config-single-file-volume-pod
spec:
  containers:
    - name: test-container
      image: gcr.io/google_containers/busybox
      command: [ "/bin/sh", "-c", "cat /etc/special-key" ]
      volumeMounts:
      - name: config-volume-1
        mountPath: /etc/special-key1
        subPath: path/to/special-key1
      - name: config-volume-2
        mountPath: /etc/special-key2
        subPath: path/to/special-key2
  volumes:
    - name: config-volume-1
      configMap:
        name: test-configmap1
        items:
        - key: data-1
          path: path/to/special-key1
    - name: config-volume-2
      configMap:
        name: test-configmap2
        items:
        - key: data-2
          path: path/to/special-key2
restartPolicy: Never

另一种方法是将它们挂载在同一目录下，但挂载在不同的子路径下，因此您无需手动指定项目.但是，这里每个configmap的密钥将被放入两个不同的目录中:

Another way is to mount them under same directory, but different subPath so that you don't have to specify items by hand. But, here keys from each configmap will be put into two different directories:

apiVersion: v1
kind: Pod
metadata:
  name: config-single-file-volume-pod
spec:
  containers:
    - name: test-container
      image: gcr.io/google_containers/busybox
      command: [ "/bin/sh", "-c", "cat /etc/special-key" ]
      volumeMounts:
      - name: config-volume-1
        mountPath: /etc/special-keys
        subPath: cm1
      - name: config-volume-2
        mountPath: /etc/special-keys
        subPath: cm2
  volumes:
    - name: config-volume-1
      configMap:
        name: test-configmap1
    - name: config-volume-2
      configMap:
        name: test-configmap2
restartPolicy: Never

cm1和cm2将是两个目录，分别包含从test-configmap1和test-configmap2中的键派生的文件.

cm1 and cm2 will be two directories containing files derived from keys in test-configmap1 and test-configmap2 respectively.

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