Quoting John (l...@jelmail.com): > > >Quoting Michael H. Warfield (m...@wittsend.com): > >>You have to add an option to the config file for your systemd > >>containers. > >> > >>lxc.autodev = 1 > > > I would like to understand a bit more about what this option does > and learn the correct way of creating devices inside a container. > > With autodev, if I understand correctly, LXC creates a 100Kb tmpfs > for /dev, overmounting any existing /dev. it creates a pts > subdirectory plus the devices listed in sutuct lxc_devs > (src/lxc/conf.c) - null, zero, full, urandom, random, tty and > console. > > What do I do if I need more than those devices in /dev? To date, I > have manually used mknod to create devices during the process of > creating a rootfs (i.e. I create them beforehand, on the host). I > see the comment in the source about providing a file, so I guess > this is being thought about? > > I like being able to do things in the main config file, so perhaps > supporting options like "lxc.dev = name mask type maj min" ?
Yup, in either the commit msg or the RFC email I suggested we would probably want to add that. I think it's a good idea. I just didn't do it :) Does someone want to write that patch? > Also, I can't work out what the autodev option does that allows > systemd to work ? It's a bit over my head but I'd like to understand It's because systemd checks whether /dev is a separate filesystem from / or not. If it not, then it mounts its own /dev, hiding the console which lxc has created, which is a unix98 pty which lxc-console will attach to. In fact it's more dangerous than that - systemd will (I'm pretty sure) mount /dev as devtmpfs type, which means it's a shared mount with the host, so changes made by the container to /dev will be reflected on the host's /dev. > if I can. What's the difference between /dev that is on the rootfs > and a /dev that is created and over-mounted? Create a fedora 14 container. Look at /dev/console and /dev/tty1 - /dev/tty4 in container and on the host. They're different. > systemd inside container = issues so far: > - creating devices in /dev > - no vty devices (cannot use lxc-console) > > Regards, > John > > ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Lxc-users mailing list Lxc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-users
