问题
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
回答1:
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.
回答2:
docker cp some_dir mysql:/opt
Instead of creating a directory copy a empty directory or file to that path in the container using docker cp.
来源:https://stackoverflow.com/questions/45553074/cannot-create-directory-permission-denied-inside-docker-container