runc run fails with "mkdir /run/runc: permission denied"

[jwendell]

I followed the instructions found on README.md:

1. Create the filesystem: docker export $(docker create busybox) | tar -C rootfs -xvf -
2. Create the config: runc spec
3. Run the image: runc run mycontainerid

Got the error: mkdir /run/runc: permission denied

Am I missing something?

[jwendell]

hmm, it seems runc must be executed as root. If that's the case, I think it's worth to mention it on README, right?

[cyphar]

@jwendell It used to be the case that runc could only be run as root. Recently (#774) runc can now be run as an unprivileged user (runc used to output "you must run me as root" but since that is no longer true the errors are less obvious). Though you're right that the README probably should be cleaned up significantly (the shell examples aren't very pretty).