How to append an argument to a container command?

Question

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?

Answer 1

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/