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ViewsHow to append an argument to a container command?
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?
3 answers
Answer question0
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/
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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
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I don't there is a way to achieve what you want, except for setting the cmd, as you mentioned.