如何将命令行参数传递给kubectl create命令 [英] How to pass command line argument to kubectl create command

问题描述

如果我使用以下命令运行 kubectl create -f deployment.yaml 命令以下 deployment.yaml 文件，一切成功.

If I run the kubectl create -f deployment.yaml command with the following deployment.yaml file, everything succeeds.

apiVersion: v1
kind: Pod
metadata:
 name: my_app
 labels:
  app: my_app
spec:
 containers:
  - name: my_app
    image: docker:5000/path_to_my_custom_image
    args: ["my_special_argument"]

但是，现在我想要一个自定义的"my_special_argument"如下

However, now I want to have a custom "my_special_argument" as follows

apiVersion: v1
kind: Pod
metadata:
 name: my_app
 labels:
  app: my_app
spec:
 containers:
  - name: my_app
    image: docker:5000/path_to_my_custom_image
    args: ["$(ARG)"]

，当我执行 kubectl create -f deployment.yaml 命令时，我想以某种方式设置$ ARG $的值.该怎么做?

and I want to somehow set the value of $ARG$ when I execute the kubectl create -f deployment.yaml command. How to do that?

我正在寻找类似的东西: kubectl create -f deployment.yaml --ARG = new_arg

I am looking for something like: kubectl create -f deployment.yaml --ARG=new_arg

可以执行这样的命令吗?

Can such command be executed?

推荐答案

您可以在 deployment.yaml

apiVersion: v1
kind: Pod
metadata:
 name: my_app
 labels:
  app: my_app
spec:
 containers:
  - name: my_app
    image: docker:5000/path_to_my_custom_image
    env:
    - name: SPECIAL_ARG_VAL
      value: "my_special_argument_val_for_my_app"
    args: ["$(SPECIAL_ARG_VAL)"]

此外，您可以使用Secrets或Configmaps加载环境变量的值.

Also, you can load the value for environment variables using Secrets or Configmaps.

Here is an example loading value from configmap

apiVersion: v1
kind: Pod
metadata:
 name: my_app
 labels:
  app: my_app
spec:
 containers:
  - name: my_app
    image: docker:5000/path_to_my_custom_image
    env:
    - name: SPECIAL_ARG_VAL
      valueFrom:
        configMapKeyRef:
          name: special-config
          key: SPECIAL_VAL_KEY
    args: ["$(SPECIAL_ARG_VAL)"]

您可以使用 kubectl 如下创建配置映射，但建议使用单独的yaml文件.

You can create the configmap using kubectl as the following, but recommend to have a separate yaml file.

kubectl create configmap special-config --from-literal=SPECIAL_VAL_KEY=my_special_argument_val_for_my_app

如果您在镜像的Dockerfile中定义了相同的环境变量，甚至可以从上面的pod yaml中删除 args .

You can even remove the args from the pod yaml above if you had the same environment variable defined in the Dockerfile for the image.

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