[lxc-users] Containers not shutting down

[Serge Hallyn]

Quoting Mark Constable (markc at renta.net):
> On 21/03/15 01:27, Serge Hallyn wrote:
> >>Since the past 2 days of updates I notice my lxc and lxd containers just hang
> >>when trying to shut them down, consequently rebooting my laptop requires a
> >>hard power button reset (so far btrfs on a SSD has survived). Also my main
> >>system privileged container does not provide any output for free and top and
> >>even an apt-get upgrade just hangs (hence I can't get systemd 219-4ubuntu7).
> >
> >Do any of the tasks in the container stick around after shutdown?
> 
> I'm not sure how to determine that because the container is pretty well unusable
> at this point.

You can analyze with 'ps -ef' from the host, as well as the cgroup 'tasks' files
under /sys/fs/cgroup/devices/lxc/v1-1/

> root at v1 ~ shutdown -h now
> Failed to start poweroff.target: Connection timed out
> 
> Broadcast message from root at ns on pts/4 (Sat 2015-03-21 10:55:28 AEST):
> 
> The system is going down for power-off NOW!
> 
> root at v1 ~ ps aux
> [hangs]
> 
> From the host I get this but I'm not sure how to analyze any of the info here...
> 
> root at mbox ~ ll /sys/fs/cgroup/devices/lxc/v1-1/system.slice/
> total 0
> drwxr-xr-x 2 root root 0 Mar 20 22:47 -.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 console-getty.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:49 courier-authdaemon.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:49 courier-imap-ssl.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:49 courier-imap.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:49 courier-mta-ssl.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:49 courier-mta.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 cron.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-hugepages.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-lxc-console.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-lxc-tty1.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-lxc-tty2.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-lxc-tty3.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-lxc-tty4.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 dev-mqueue.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 getty-static.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 ifup-wait-all-auto.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 lvm2.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 memcached.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 mysql.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 networking.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:51 nginx.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 nscd.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:49 ondemand.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 php5-fpm.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 proc-cpuinfo.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 proc-meminfo.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 proc-stat.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 proc-sysrq\x2dtrigger.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 proc-uptime.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 rc-local.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 resolvconf.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 rsyslog.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 ssh.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 sys-devices-virtual-net.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 sys-fs-fuse-connections.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 sys-kernel-debug.mount/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 sysstat.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 system-container\x2dgetty.slice/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 system-getty.slice/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-journal-flush.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-journald.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-random-seed.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-remount-fs.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-tmpfiles-setup.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-update-utmp.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 systemd-user-sessions.service/
> drwxr-xr-x 2 root root 0 Mar 20 22:47 udev-finish.service/
> -rw-r--r-- 1 root root 0 Mar 20 22:47 cgroup.clone_children
> -rw-r--r-- 1 root root 0 Mar 20 22:47 cgroup.procs
> --w------- 1 root root 0 Mar 20 22:47 devices.allow
> --w------- 1 root root 0 Mar 20 22:47 devices.deny
> -r--r--r-- 1 root root 0 Mar 20 22:47 devices.list
> -rw-r--r-- 1 root root 0 Mar 20 22:47 notify_on_release
> -rw-r--r-- 1 root root 0 Mar 20 22:47 tasks
> 
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