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This is a part of my dockerfile:
COPY ./startup.sh /root/startup.sh
RUN chmod +x /root/startup.sh
ENTRYPOINT ["/root/startup.sh"]
EXPOSE 3306
CMD ["/usr/bin/mysqld_safe"]
USER jenkins
I have to switch in the end to USER jenkins and i have to run the container as jenkins.
My Question is now how can I run the startup.sh as root user when the container starts?
587
As an alternative, we can also access the Docker container as root. In this case, we'll use the nsenter command to access the Docker container. To use the nsenter command, we must know the PID of the running container. This allows us to access the Docker container as a root user and run any command to access any file.
To run a command as a different user inside your container, add the --user flag: docker exec --user guest container-name whoami.
In order to execute a command as root on a container, use the “docker exec” command and specify the “-u” with a value of 0 for the root user.
ENTRYPOINT is the other instruction used to configure how the container will run. Just like with CMD, you need to specify a command and parameters. However, in the case of ENTRYPOINT we cannot override the ENTRYPOINT instruction by adding command-line parameters to the `docker run` command.
Delete the USER jenkins line in your Dockefile.
Change the user at the end of your entrypoint script (/root/startup.sh).
by adding: su - jenkins man su
Example:
Dockerfile
FROM debian:8
RUN useradd -ms /bin/bash exemple
COPY entrypoint.sh /root/entrypoint.sh
ENTRYPOINT "/root/entrypoint.sh"
entrypoint.sh
#!/bin/bash
echo "I am root" && id
su - exemple
# needed to run parameters CMD
$@
Now you can run
$ docker build -t so-test .
$ docker run --rm -it so-test bash
I am root
uid=0(root) gid=0(root) groups=0(root)
exemple@37b01e316a95:~$ id
uid=1000(exemple) gid=1000(exemple) groups=1000(exemple)
It's just a simple example, you can also use the su -c option to run command with changing user.
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