How to mount /proc in Docker Container

Asked Sep 16 '21 at 23:55

Active Nov 23 '22 at 07:20

Viewed 1,706 times

Why can't I mount the /proc device from the container during the build process?

If I run docker build -t test . with this Dockerfile:

FROM debian:stable-slim
RUN bash -c 'ls {/proc,/dev,/sys}'

I can see that all special devices are populated. But if I try this Dockerfile:

FROM debian:stable-slim
RUN bash -c 'ls {/proc,/dev,/sys}'
RUN mount --bind /proc /mnt

I get the following error:

mount: /mnt: permission denied.
The command '/bin/sh -c mount --bind /proc /mnt' returned a non-zero code: 32

I know it's possible to use --privileged mode in docker run, but my goal is not to access the host's /proc but to just mount the /proc device from container in a file system that I'm generating inside the container with debootstrap. So that I can install some packages, specifically default-jre.

My Docker Version: 20.10.8

EDIT

My goal is to create a custom live-cd like here, so I can't use the container's base OS.

edited Sep 17 '21 at 16:43

asked Sep 16 '21 at 23:55

wiltonsr

3

Docker mounts /proc before it starts the container process, and at that point, nothing else is permitted. – Jonathon Reinhart Sep 17 '21 at 00:52
I need to debootstrap a system inside container and install some packages. There is any workaround? – wiltonsr Sep 17 '21 at 01:48
2

If you're starting `FROM debian`, you already have the base OS available; you don't need to run low-level first-time installation tools like `debootstrap`. – David Maze Sep 17 '21 at 01:51
My goal is to create a custom live-cd like [here](https://willhaley.com/blog/custom-debian-live-environment/), so I can't use the base OS. – wiltonsr Sep 17 '21 at 11:51
Did you ever find a workaround to this? – rgov Nov 18 '22 at 18:06
@rgov unfortunately not. – wiltonsr Nov 23 '22 at 18:41

How to mount /proc in Docker Container

0 Answers0