On Sat, Jan 24, 2015 at 2:29 PM, Stéphane Graber <[email protected]> wrote: > On Sat, Jan 24, 2015 at 02:14:15PM -0500, S.Çağlar Onur wrote: >> Hey Stéphane, >> >> On Fri, Jan 23, 2015 at 1:47 PM, Stéphane Graber <[email protected]> wrote: >> > On Fri, Jan 23, 2015 at 06:19:46PM +0000, Serge Hallyn wrote: >> >> Quoting Mathias Gibbens ([email protected]): >> >> > On Fri, 2015-01-23 at 00:48 +0000, Mathias Gibbens wrote: >> >> > > Hello, >> >> > > >> >> > > I've been testing LXC 1.1-rc1 on a Debian jessie system. >> >> > > Specifically, >> >> > > since all the pieces are now in place to support systemd in >> >> > > unprivileged >> >> > > containers, I've been testing running Debian jessie within an >> >> > > unprivileged container. >> >> > > >> >> > > The jessie container successfully starts (there are some errors >> >> > > along >> >> > > the way, but that's another issue), and I can do a `lxc-attach`, add a >> >> > > user and log in. However, if I run `top` within the container I only >> >> > > get >> >> > > two lines of output: >> >> > > >> >> > > top - 00:13:25 up 4 min, 0 users, load average: 0.01, 0.05, 0.05 >> >> > > Tasks: 10 total, 1 running, 9 sleeping, 0 stopped, 0 zombie >> >> > > >> >> > > Furthermore, the host system breaks spectacularly: >> >> > > >> >> > > lxc@lxc:~$ top >> >> > > Error, do this: mount -t proc proc /proc >> >> > > lxc@lxc:~$ /sbin/ifconfig >> >> > > Warning: cannot open /proc/net/dev (No such file or directory). >> >> > > Limited >> >> > > output. >> >> > > lxc@lxc:~$ mount >> >> > > mount: failed to read mtab: No such file or directory >> >> > > lxc@lxc:~$ df >> >> > > df: cannot read table of mounted file systems: No such file or >> >> > > directory >> >> > > lxc@lxc:~$ sudo reboot >> >> > > Running in chroot, ignoring request. >> >> > > >> >> > > It seems that /proc is being unmounted somehow on the host. I can >> >> > > re-mount /proc on the host, and things seem to work again. (I haven't >> >> > > tested too much after re-mounting, instead opting to just reboot the >> >> > > host back to a known good state.) >> >> > > >> >> > > Any idea what is causing this to happen? I have also tried running >> >> > > Ubuntu Vivid as an unprivileged container and see the same results. I >> >> > > have not yet tried a different Linux distro for the host system. >> >> > > >> >> > > Host system details: Debian jessie with kernel 3.16.7-ckt2-1 x86_64, >> >> > > systemd-215, LXC-1.1-rc1 and lxcfs built from current git checkout, >> >> > > cgmanager-0.35 as packaged from the sid repository. >> >> > > >> >> > > Thanks for any ideas, >> >> > > Mathias >> >> > >> >> > This morning I setup a host running Ubuntu Vivid with cgmanager, lxc, >> >> > and lxcfs packages installed from the daily PPA. I setup two >> >> >> >> But did you install the systemd-sysv package? >> >> >> >> > unprivileged containers, Debian jessie and Ubuntu Vivid, and ran `top` >> >> > within each one. On the Vivid host, `top` runs properly and the host >> >> > system does not break. >> >> > >> >> > So, it seems that the breakage is due to running jessie on the host >> >> > system. Any ideas why this is happening, or where I could begin looking >> >> > to debug this problem? >> >> >> >> No, I've just reproduced it, but it requires systemd to do so. >> >> >> >> Note that you'll have to manually chown your name=systemd cgroup >> >> to your user for the lxc-start to succeed. >> > >> > >> > Hey, >> > >> > So we've just tracked down that bug and it's a critical flaw in lxcfs >> > which we've now fixed upstream. I tagged LXCFS 0.4 with the fix and am >> > publishing it now on our website and uploading it to Ubuntu. >> >> https://launchpad.net/~ubuntu-lxc/+archive/ubuntu/daily still shows >> the old lxcfs version. Should I be tracking some other repo? > > Oops, no. I uploaded to vivid but forgot to refresh the PPA. Doing that now.
Thanks! Restarting lxcfs breaks running containers, is this expected? This happened just after upgrade; [caglar@qop:~/go/src/gopkg.in/lxc/go-lxc.v2/examples] sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages will be upgraded: lxcfs 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 19.1 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://ppa.launchpad.net/ubuntu-lxc/daily/ubuntu/ trusty/main lxcfs amd64 0.4-0ubuntu1~ubuntu14.04.1~ppa1 [19.1 kB] Fetched 19.1 kB in 0s (42.2 kB/s) (Reading database ... 204049 files and directories currently installed.) Preparing to unpack .../lxcfs_0.4-0ubuntu1~ubuntu14.04.1~ppa1_amd64.deb ... lxcfs stop/waiting Unpacking lxcfs (0.4-0ubuntu1~ubuntu14.04.1~ppa1) over (0.3-0ubuntu1~ubuntu14.04.1~ppa1) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Processing triggers for ureadahead (0.100.0-16) ... Setting up lxcfs (0.4-0ubuntu1~ubuntu14.04.1~ppa1) ... lxcfs start/running, process 24251 [caglar@qop:~/go/src/gopkg.in/lxc/go-lxc.v2/examples] ./attach 2015/01/24 14:41:56 AttachShell root@rubik:/# free -m Error: /proc must be mounted To mount /proc at boot you need an /etc/fstab line like: proc /proc proc defaults In the meantime, run "mount proc /proc -t proc" root@rubik:/# exit and I can reproduce it by just restarting the lxcfs service [caglar@qop:~/go/src/gopkg.in/lxc/go-lxc.v2/examples] ./attach 2015/01/24 14:42:24 AttachShell root@rubik:/# free -m total used free shared buffers cached Mem: 128 10 117 5 0 0 -/+ buffers/cache: 10 117 Swap: 975 0 975 root@rubik:/# exit 2015/01/24 14:42:29 RunCommand uid=0(root) gid=0(root) groups=0(root) [caglar@qop:~/go/src/gopkg.in/lxc/go-lxc.v2/examples] sudo restart lxcfs lxcfs start/running, process 26069 [caglar@qop:~/go/src/gopkg.in/lxc/go-lxc.v2/examples] ./attach 2015/01/24 14:42:37 AttachShell root@rubik:/# free -m Error: /proc must be mounted To mount /proc at boot you need an /etc/fstab line like: proc /proc proc defaults In the meantime, run "mount proc /proc -t proc" root@rubik:/# >> >> > Thanks for reporting this! >> > >> > -- >> > Stéphane Graber >> > Ubuntu developer >> > http://www.ubuntu.com >> > >> > _______________________________________________ >> > lxc-devel mailing list >> > [email protected] >> > http://lists.linuxcontainers.org/listinfo/lxc-devel >> > >> >> -- >> S.Çağlar Onur <[email protected]> >> _______________________________________________ >> lxc-devel mailing list >> [email protected] >> http://lists.linuxcontainers.org/listinfo/lxc-devel > > -- > Stéphane Graber > Ubuntu developer > http://www.ubuntu.com > > _______________________________________________ > lxc-devel mailing list > [email protected] > http://lists.linuxcontainers.org/listinfo/lxc-devel > -- S.Çağlar Onur <[email protected]> _______________________________________________ lxc-devel mailing list [email protected] http://lists.linuxcontainers.org/listinfo/lxc-devel
