On Sun, Feb 16, 2014 at 12:49:44PM -0500, Brian Campbell wrote: > On Feb 16, 2014, at 12:23 PM, Stéphane Graber <stgra...@ubuntu.com> wrote: > > > On Sun, Feb 16, 2014 at 03:51:50AM -0500, Brian Campbell wrote: > >> I'm running Debian Jessie (testing), and compiled lxc from a fresh git > >> clone (7da8ab1: close inherited fds when we still have proc mounted). I > >> would like to create a user container without using root privileges, so I > >> set up UID mappings such that my user ID would map to root within the > >> container. From what I can tell, this is all that should be necessary to > >> get it to use user namespaces to operate unprivileged: > >> > >> lambda@gherkin:lxc$ cat ~/.config/lxc/default.conf > >> lxc.id_map = u 0 1000 9999 > >> lxc.id_map = g 0 1000 9999 > >> lambda@gherkin:lxc$ id > >> uid=1000(lambda) gid=1000(lambda) > >> groups=1000(lambda),24(cdrom),25(floppy),27(sudo),29(audio),30(dip),44(video),46(plugdev),104(scanner),109(bluetooth),112(netdev),125(vboxusers) > > > > From the above, it seems like you didn't configure /etc/subuid and > > /etc/subgid. Without those (and a version of the shadow package which > > supports them), you won't be able to switch to those UID ranges. > > Nope, I haven't done anything with them, and it looks like Debian's passwd > doesn't have subuid/subgid support. Taking a look at the Ubuntu changelog, it > looks like they were added as a patch to the Ubuntu package in > 1:4.1.5.1-1ubuntu5. Is there a Debian package already available for this, or > should I try to extract the patches from the Ubuntu package and build my own? > > Ah, looks like I should have read this: > https://s3hh.wordpress.com/2013/07/19/creating-and-using-containers-without-privilege/ > before trying this; all I had seen was > https://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg05859.html > which didn't mention anything about /etc/subuid and /etc/subgid.
The shadow change was submitted to Debian at the same time we pushed it to Ubuntu, but last I checked it was still in an unreleased git branch... For unprivileged containers with current kernel and LXC (and a distro with the new shadow), there's also an article I wrote a little while back at: https://www.stgraber.org/2014/01/17/lxc-1-0-unprivileged-containers/ -- Stéphane Graber Ubuntu developer http://www.ubuntu.com
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