Can not create folder during image building with non root user added to sudoers group. Here is my Dockerfile:
FROM ubuntu:16.04
RUN apt-get update && \
apt-get -y install sudo
RUN adduser --disabled-password --gecos '' newuser \
&& adduser newuser sudo \
&& echo '%sudo ALL=(ALL:ALL) ALL' >> /etc/sudoers
USER newuser
RUN mkdir -p /newfolder
WORKDIR /newfolder
I get error: mkdir: cannot create directory '/newfolder': Permission denied
Filesystems inside a Docker container work just like filesytems outside a Docker container: you need appropriate permissions if you are going to create files or directories. In this case, you're trying to create /newfolder as a non-root user (because the USER directive changes the UID used to run any commands that follow it). That won't work because / is owned by root and has mode dr-xr-xr-x.
Try instead:
RUN mkdir -p /newfolder
RUN chown newuser /newfolder
USER newuser
WORKDIR /newfolder
This will create the directory as root, and then chown it.
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