How to append an argument to a container command?

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I have node.js application built using Dockerfile that defines:

CMD node dist/bin/index.js

I'd like to "append" a parameter to the command as it is defined in Dockerfile, i.e. I want to execute the program as node dist/bin/index.js foo.

In docker land I am able to achieve this via:

docker build --tag test .
docker run test foo 

In kubernetes I cannot use command because that will override the ENTRYPOINT. I cannot use args because that will override the cmd defined in the Dockerfile. It appears that my only option is:

cmd: ["node", "dist/bin/index.js", "foo"]

Is there a way to append an argument to a container command without redefining the entire Docker CMD definition?

No way to append. You can either set the command: or args: on container.spec. You can learn more about how to override CMD/ENTRYPOINT here: https://kubernetes.io/docs/concepts/configuration/container-command-args/

Define a Command and Arguments for a Container, This page shows how to define commands and arguments when you run a container in a PodA Pod represents a set of running containers in� I have the following Dockerfile: FROM python:3.6 ADD . / RUN pip install -r requirements.txt ENTRYPOINT ["python3.6", "./main.py"] Where main.py takes in run time arguments th

You might be able to achieve the same effect using an optional param in your Dockerfile:

ENV YOUR_OPTIONAL_PARAM
CMD node dist/bin/index.js $YOUR_OPTIONAL_PARAM

Arguments and variables in Docker, “How do I get my secrets to the running application in my container? These command line arguments can be hard to sort through, and they are This will add a key called VER to the custom resource with a value of 0.0.1� The main script file name is stored in $0 which receives argument values from command line arguments. If two arguments are passed in command line then the argument values will be received in $1 and $2 variables sequentially. Example -1: Sending three numeric values as arguments. Create a bash file and add the following code.

I don't there is a way to achieve what you want, except for setting the cmd, as you mentioned.

Docker run not appending arguments to image entrypoint, It turns out the answer is to use the array form of ENTRYPOINT (and/or CMD ) in order for appending from command line to work. with: ENTRYPOINT ["uwsgi"� Tutorial: Use an HTTP-triggered Azure function to create a container group. 06/10/2020; 6 minutes to read; In this article. Azure Functions is a serverless compute service that can run scripts or code in response to a variety of events, such as an HTTP request, a timer, or a message in an Azure Storage queue.

Let me know if I misunderstood your question, but if you just want to pass a parameter to the POD you can run your command inside the entrypoint script and use an environment variable that you pass to the container for that command. This should work in any Pod spec (as part of the deployment description for example).

Example

apiVersion: v1
kind: Pod
metadata:
  name: envar-demo
  labels:
    purpose: demonstrate-envars
spec:
  containers:
  - name: envar-demo-container
    image: gcr.io/google-samples/node-hello:1.0
    env:
    - name: DEMO_GREETING
      value: "Hello from the environment"

For more see this doc.

Demystifying ENTRYPOINT and CMD in Docker, 中文版 – As you begin your Docker container creation journey, you might find ENTRYPOINT + CMD = default container command arguments Then you can append program arguments naturally on the command line, such� Now maybe command line arguments just aren’t for you; maybe you want to pass things along to more than just your entrypoint through the lifetime of your container; maybe you need environment variables. Just as build arguments are used as environment variables at build time, you can also pass environment variables to containers at runtime:

Docker CMD VS Entrypoint commands: What's the difference?, You can run this image as the base of a container without adding command-line arguments. In that� Since there is no command-line argument, the container will run the default CMD instruction and display the Hello World message. However, if you add an argument when starting a container, it overrides the CMD instruction. For example, add the hostname argument to the docker run command: sudo docker run [image_name] hostname

Dockerfile reference, The docker build command builds an image from a Dockerfile and a context. repositories after the build, add multiple -t parameters when you run the build command: The EXPOSE instruction informs Docker that the container listens on the� The command and arguments that you define cannot be changed after the Pod is created. The command and arguments that you define in the configuration file override the default command and arguments provided by the container image. If you define args, but do not define a command, the default command is used with your new arguments.

docker run, The docker run command first creates a writeable container layer over the specified image, and then GPU devices to add to the container ('all' to pass all GPUs) Containers can be specified by repetitions of the --volumes-from argument. To modify the output, start a second container with the --environment-variables argument added, specifying values for the NumWords and MinLength variables. (This example assume you are running the CLI in a Bash shell or Azure Cloud Shell.