Question 81651 in Docker Question posted in
The official documentation can be found here.

Exec form of RUN instruction in Dockerfile

For the below "shell" form of RUN instruction, what would be the "exec" form?

RUN echo `uname -rv` > $HOME/kernel-info

I tried below, its giving the error, cat: can't open '/root/kernel-info': No such file or directory

RUN ["echo","uname", "-rv", ">", "$HOME","/kernel-info" ]
Tags:

2

Answers


  1. 0

    To use a different shell, other than /bin/sh, use the exec form passing in the desired shell. For example:

    RUN ["/bin/bash", "-c", "echo hello"]
    Login or Signup to reply.
  2. 0

    You’re using output redirection and environment variable substitution which are both done by the shell. So you need a shell to run. If you prefer the exec form, you need to run the shell yourself, like this

    RUN [ "/bin/sh", "-c", "echo `uname -rv` > $HOME/kernel-info" ]
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search