How to manage command line arguments in docker run command?

Question

I want to run this command inside a container: java -jar bin/felix.jar > log.txt

If I manually do:

frog@gooseberry:~/path$ sudo docker run -it 5fe6598e0648 /bin/bash
root@9beabfb5e852:/path# java -jar bin/felix.jar > log.txt
[... program running ...]

Everything works, but if I try to launch it with:

frog@gooseberry:~/path$ sudo docker run -d 5fe6598e0648 "java -jar bin/felix.jar > log.txt"

I get the following error:

857bb5fcdbd7a315517bc9031d65b26abcaaad1fac7a29574e39a0289d0d77a3
2014/10/20 10:20:53 Error response from daemon: Cannot start container 857bb5fcdbd7a315517bc9031d65b26abcaaad1fac7a29574e39a0289d0d77a3: exec: "java -jar bin/felix.jar > log.txt": stat java -jar bin/felix.jar > log.txt: no such file or directory

I get the same error if I try to use the inverted commas '' instead of the double commas "".

I want to use commas because of > log.txt part, that otherwise would be interpreted by the terminal running on the host machine.

This answer suggest to use the -c option of /bin/bash. It bypasses the problem (and it works), but there is a solution provided by Docker to this problem? How command line arguments should be managed with the command docker run?

@Rob3 as I told in the question, I already have a solution, but I was looking for the "best" method (how it should be done) to manage command line arguments in Docker — Manuel Durando
– Manuel Durando, Commented Oct 29, 2014 at 9:10

Amos Folarin · Accepted Answer · 2014-10-22 12:45:54Z

3

the '>' is getting interpreted in the local env.

This will work:

sudo docker run -d 5fe6598e0648 -c "java -jar bin/felix.jar > log.txt"

The default entrypoint is /bin/sh - you can pass the arg to this as a string with the -c option.

Docker provide the CLI option to set you own --entrypoint inline, a default in your Dockerfile ENTRYPOINT. You could set either of these to be include the -c.

answered Oct 22, 2014 at 12:45

Amos Folarin

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3 Comments

Manuel Durando Over a year ago

Thank you for your answer. The solution you suggested is the same I cited in my answer. In addition of -c bash option, Is there an official suggested way to manage command line arguments in Docker?

Amos Folarin Over a year ago

Don't think the issue is with Docker, rather how the shell processes the command line args.

Amos Folarin Over a year ago

We'll not sure I follow what you want (your command needs to be run by something). You have a CMD/run command and and ENTRYPOINT/--entrypoint which is what the command is passed to. the entrypoint and command are concatenated.

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