如何将环境变量传递给在Kubernetes中作为卷访问的ConfigMap中的脚本

huangapple
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英文:

How to pass environment variables to a script present in ConfigMap while accessing it as a volume in Kubernetes

问题

我有以下的ConfigMap，其中包含一个名为VAR的变量。在访问该变量作为一个卷时，这个变量应该从工作流中获取值。

  1. apiVersion: v1
  2. kind: ConfigMap
  3. metadata:
  4.   name: test-pod-cfg
  5. data:
  6.   test-pod.yaml: |-
  7.     apiVersion: v1
  8.     kind: Pod
  9.     metadata:
  10.       name: test-pod
  11.     spec:
  12.       containers:
  13.         - name: test
  14.           image: ubuntu
  15.           command: ["/busybox/sh", "-c", "echo $VAR"]

以下是一个 Argo 工作流，它正在从 ConfigMap 中提取脚本 test-pod.yaml 并将其添加为容器的一个卷。在这里，如何动态传递环境变量 VAR 给 ConfigMap 以进行替换呢？

  1. apiVersion: argoproj.io/v1alpha1
  2. kind: Workflow
  3. metadata:
  4.   name: test-wf-
  5. spec:
  6.   entrypoint: main
  7.   templates:
  8.     - name: main
  9.       container:
  10.         image: "ubuntu"
  11.         command: ["/bin/sh", "-c", "cat /mnt/vc/test"]
  12.         volumeMounts:
  13.           - name: vc
  14.             mountPath: "/mnt/vc"
  15.       volumes:
  16.         - name: vc
  17.           configMap:
  18.             name: test-pod-cfg
  19.             items:
  20.               - key: test-pod.yaml
  21.                 path: test
英文:

I have the following ConfigMap which is having a variable called VAR. This variable should get the value from the workflow while accessing it as a volume

  1. apiVersion: v1
  2. kind: ConfigMap
  3. metadata:
  4.   name: test-pod-cfg
  5. data:
  6.   test-pod.yaml: |-
  7.     apiVersion: v1
  8.     kind: Pod
  9.     metadata:
  10.       name: test-pod
  11.     spec:
  12.       containers:
  13.         - name: test
  14.           image: ubuntu
  15.           command: ["/busybox/sh", "-c", "echo $VAR"]

Here is the argo workflow which is fetching script test-pod.yaml in ConfigMap and adding it as a volume to container. In this how to pass Environment variable VAR to the ConfigMap for replacing it dynamically

  1. apiVersion: argoproj.io/v1alpha1
  2. kind: Workflow
  3. metadata:
  4.   name: test-wf-
  5. spec:
  6.   entrypoint: main
  7.   templates:
  8.     - name: main
  9.       container:
  10.         image: "ubuntu"
  11.         command: ["/bin/sh", "-c", "cat /mnt/vc/test"]
  12.         volumeMounts:
  13.           - name: vc
  14.             mountPath: "/mnt/vc"
  15.       volumes:
  16.         - name: vc
  17.           configMap:
  18.             name: test-pod-cfg
  19.             items:
  20.               - key: test-pod.yaml
  21.                 path: test

答案1

得分: 1

要将ConfigMap挂载为一个卷并使环境变量VAR在容器中可用，您需要在Pod的规范中添加一个卷，并在容器的规范中设置环境变量。

在卷规范中，您需要将ConfigMap添加为卷源，并设置包含环境变量的文件的路径。例如：

  1. spec:
  2.   entrypoint: test-pod
  3.   templates:
  4.   - name: test-pod
  5.     container:
  6.       image: ubuntu
  7.       command: ["/busybox/sh", "-c", "echo $VAR"]
  8.       volumeMounts:
  9.       - name: config
  10.         mountPath: /etc/config
  11.       env:
  12.       - name: VAR
  13.         valueFrom:
  14.           configMapKeyRef:
  15.             name: test-pod-cfg
  16.             key: test-pod.yaml
  17.     volumes:
  18.     - name: config
  19.       configMap:
  20.         name: test-pod-cfg

环境变量VAR然后将在容器中以ConfigMap中指定的值可用。

要了解更多信息，请查看官方文档。

英文:

To mount the ConfigMap as a volume and make the environment variable VAR available to the container, you will need to add a volume to the pod's spec and set the environment variable in the container's spec.

In the volume spec, you will need to add the ConfigMap as a volume source and set the path to the file containing the environment variable. For example:

  1. spec:
  2.   entrypoint: test-pod
  3.   templates:
  4.   - name: test-pod
  5.     container:
  6.       image: ubuntu
  7.       command: ["/busybox/sh", "-c", "echo $VAR"]
  8.       volumeMounts:
  9.       - name: config
  10.         mountPath: /etc/config
  11.       env:
  12.       - name: VAR
  13.         valueFrom:
  14.           configMapKeyRef:
  15.             name: test-pod-cfg
  16.             key: test-pod.yaml
  17.     volumes:
  18.     - name: config
  19.       configMap:
  20.         name: test-pod-cfg

The environment variable VAR will then be available in the container with the value specified in the ConfigMap.

For more information follow this official doc.

huangapple
  • 本文由 发表于 2023年2月18日 01:37:00
  • 转载请务必保留本文链接：https://go.coder-hub.com/75487549.html
  • argo
  • argo-workflows
  • kubernetes
  • yaml
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