run chroot within docker

Question

I've a commercial app, that is shipped in a chroot environment : the startup script is making the chroot, and starting the exe.

The App is pretty complex, and also for support purposes, I don't want to change the all environment.

Is it possible to run chroot, and start the service in docker ? Or are the two incompatible ?

Should be fine. Why not try it and ask a specific question if you have problems? — Adrian Mouat, Oct 20 '15 at 11:46

score 7 · Accepted Answer · edited May 23 '17 at 11:53

7

It is possible to make a chroot inside a container... but, as mentioned in "debootstrap inside a docker container", you might need to run with the privileged mode.

docker run --privileged

By default, Docker containers are “unprivileged” and cannot, for example, run a Docker daemon inside a Docker container.
This is because by default a container is not allowed to access any devices, but a “privileged” container is given access to all devices.

There was a huge discussion for requesting docker to support privileged operations.
So far, it is not happening.

edited May 23 '17 at 11:53

Community

1
1

answered Oct 20 '15 at 11:52

VonC

1,129,465
480
4,036
4,755

How would you incorporate this in a supervisor configuration ? : - I need to make the chroot, - Then start 3 skripts – OpenStove Oct 22 '15 at 12:34
@OpenStove Have a look at https://github.com/phusion/baseimage-docker which is using a supervisor-like mechanism (I described it in http://stackoverflow.com/a/33119321/6309). You would still need to run the container in privieged mode though. – VonC Oct 22 '15 at 12:41

score 5 · Answer 2 · answered Nov 20 '20 at 21:30

5

Option --cap-add=SYS_CHROOT should do the job.

answered Nov 20 '20 at 21:30

damian101

61
2
4

run chroot within docker

2 Answers2

Linked