chown: /etc/resolv.conf: 只读文件系统

Question

I have this dockerfile which errors - I believe it errors during run because there are lack of permissions set on the docker user . I am not sure that the user should be declared as app after the RUN command is executed. But I am not great with docker and the person who wrote this is on holiday.

Also, this docker file is executed as part of docker-compose up

Any insights?

ENV CONFIG_ROOT="/etc/"

USER root

COPY . $HOME/myproject

RUN mkdir /etc/myproject && \ 
    cp -R $HOME/myproject/.envs/myproject $CONFIG_ROOT && \
    chown app:app -R $CONFIG_ROOT && \
    chown app:app -R $HOME

USER app

RUN pip install --user myproject/ && \
                rm -rf $HOME/myproject

ENTRYPOINT ["myproject"]

Error

[3/4] RUN mkdir /etc/myproject && cp -R /home/app/myproject/.envs/myproject /etc/ && chown app:app -R /etc/ && chown app:app -R /home/app: #7 0.238 chown: /etc/hosts: Read-only file system #7 0.326 chown: /etc/resolv.conf: Read-only file system

executor failed running [/bin/sh -c mkdir /etc/myproject && cp -R $HOME/myproject/.envs/myproject $CONFIG_ROOT && chown app:app -R $CONFIG_ROOT && chown app:app -R $HOME]: exit code: 1

Answer 1

To solve this, you need create your container with --privileged parameter.

ex.:

docker run --privileged -i --name master --hostname k8s-master -d ubuntu:20.04