Non-root user in Docker

Question

I have a basic Dockerfile:

FROM ubuntu:xenial
USER test
ENTRYPOINT ["/bin/bash"]

For this Dockerfile, I want to be able to create a user without a password, and when the Docker container is run, I want that user to be used, instead of root. When I try to run the container, docker run -it test:1, I get this error:

docker: Error response from daemon: linux spec user: unable to find user test: no matching entries in passwd file.

How can I create a user in a Dockerfile and have that user be the default user when the container is run interactively?

Possible duplicate of [Add User to Docker Container](http://stackoverflow.com/questions/27701930/add-user-to-docker-container) — Felix Glas, Feb 15 '17 at 00:02

score 18 · Accepted Answer · answered Feb 15 '17 at 00:31

18

Add RUN useradd -s /bin/bash user before the USER directive.

answered Feb 15 '17 at 00:31

Ricardo Branco

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That worked and did exactly what I wanted it to do, thanks! – Sienna Feb 15 '17 at 15:11
Is this only on Linux? Or same in Windows? – variable May 29 '20 at 11:43
Sorry, I don't know about Windows. – Ricardo Branco Jun 03 '20 at 09:34
1

@variable on Windows, you can follow the instructions from https://docs.docker.com/engine/reference/builder/#user, i.e. `net user /add my_user` – LiHRaM Aug 18 '20 at 10:31

Non-root user in Docker

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