On Tue, Nov 12, 2013 at 08:31:03AM -0500, Michael H. Warfield wrote: > Ok all... > > Seems like this just started happening in the last few weeks and I'm not > sure when... But... My newly created Ubuntu containers are failing to > start on my Fedora hosts because of a mount problem. So... > > What's this, what does it do, and is this really required? > > [root@hydra mhw]# lxc-create -n Ubuntu -t ubuntu -- --release raring > lxc_container: No such file or directory - Failed to make / rslave to run > template > lxc_container: Continuing... > Checking cache download in /var/cache/lxc/raring/rootfs-amd64 ... > Copy /var/cache/lxc/raring/rootfs-amd64 to /var/lib/lxc/Ubuntu/rootfs ... > Copying rootfs to /var/lib/lxc/Ubuntu/rootfs ... > Generating locales... > en_US.UTF-8... up-to-date > Generation complete. > Creating SSH2 RSA key; this may take some time ... > Creating SSH2 DSA key; this may take some time ... > Creating SSH2 ECDSA key; this may take some time ... > > ## > # The default user is 'ubuntu' with password 'ubuntu'! > # Use the 'sudo' command to run tasks as root in the container. > ## > > [root@hydra mhw]# lxc-start -n Ubuntu > lxc-start: No such file or directory - failed to mount > '/sys/fs/fuse/connections' on '/usr/lib64/lxc/rootfs/sys/fs/fuse/connections' > lxc-start: failed to setup the mounts for 'Ubuntu' > lxc-start: failed to setup the container > lxc-start: invalid sequence number 1. expected 2 > lxc-start: failed to spawn 'Ubuntu' > [root@hydra mhw]# > > Now... If I remove this line from /var/lib/lxc/Ubuntu/fstab, then > things seem to all work. The container boots and seems to function. > > /sys/fs/fuse/connections sys/fs/fuse/connections none bind 0 0 > > What breaks in Ubuntu if I do this? Why is ANY "fuse" fs being included > in a container? Are any hosts expected to have a requirement for user > space file system? Ok... Maybe an overlayfs I can understand, but... > > Regards, > Mike > -- > Michael H. Warfield (AI4NB) | (770) 978-7061 | m...@wittsend.com > /\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/ > NIC whois: MHW9 | An optimist believes we live in the best of all > PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it! >
Hi, fuse is allowed in Ubuntu containers because we consider it safe to use (as in, no worse than running as a user on the host). It's needed for at least sshfs and I believe some other workloads that some of our users are running (we allowed fused as a result of several bug reports). It sounds like the line could however be changed to: /sys/fs/fuse/connections sys/fs/fuse/connections none bind,optional 0 0 Which would make LXC ignore the mount failure and should make the container work again for you. -- Stéphane Graber Ubuntu developer http://www.ubuntu.com
signature.asc
Description: Digital signature
------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk
_______________________________________________ Lxc-devel mailing list Lxc-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-devel
