[lxc-users] lxc-start hangs with no output

[Giuseppe Tofoni]

Hi, Piotr

One possible solution is to not mount /cgroup in fstab on the host.

My configuration:
Slackware 14.1
lxc version 0.9.0
kernel 3.12.5

try it and good luck

Giuseppe



2014/1/3 Piotr Isajew <pki at ex.com.pl>

> Hi,
>
> I wanted do try out lxc on Slackware 14.1 64-bit. lxc-create
> works without problems. I'm however unable to start a container.
>
> After I do i.e.:
>
> lxc-start -n vs0
>
> the command just hangs with no output, consuming all the CPU
> resources and eventually eating up all the memory.
>
> I've spent last three days trying to get it work but I think I've
> ran out of ideas.
>
>
> log file contains:
>
>       lxc-start 1388667324.768 INFO     lxc_start_ui - using rcfile
> /var/lib/lxc/vs0/config
>       lxc-start 1388667324.769 INFO     lxc_apparmor - apparmor_load -
> apparmor is disabled
>       lxc-start 1388667324.770 DEBUG    lxc_conf - allocated pty
> '/dev/pts/2' (5/6)
>       lxc-start 1388667324.771 DEBUG    lxc_conf - allocated pty
> '/dev/pts/3' (7/8)
>       lxc-start 1388667324.771 DEBUG    lxc_conf - allocated pty
> '/dev/pts/4' (9/10)
>       lxc-start 1388667324.771 DEBUG    lxc_conf - allocated pty
> '/dev/pts/5' (11/12)
>       lxc-start 1388667324.771 INFO     lxc_conf - tty's configured
>       lxc-start 1388667324.771 DEBUG    lxc_console - using
> '/tmp/console.log' as console log
>       lxc-start 1388667324.771 DEBUG    lxc_console - using '/dev/tty' as
> console
>       lxc-start 1388667324.771 DEBUG    lxc_start - sigchild handler set
>       lxc-start 1388667324.771 INFO     lxc_start - 'vs0' is initialized
>       lxc-start 1388667324.777 DEBUG    lxc_start - Not dropping
> cap_sys_boot or watching utmp
>
>       lxc-start 1388667324.777 INFO     lxc_conf - opened
> /var/lib/lxc/vs0/rootfs.hold as fd 20
>
> After I kill the lxc-start process there are many entries like
> vs0-1234 in /cgroup/lxc
>
> My configuration is as follows:
>
> Linux kontrabanda 3.10.17 #4 SMP Thu Jan 2 19:49:59 CET 2014 x86_64
> Intel(R) Atom(TM) CPU D425   @ 1.80GHz GenuineIntel GNU/Linux
>
>
> # lxc-checkconfig
> --- Namespaces ---
> Namespaces: enabled
> Utsname namespace: enabled
> Ipc namespace: enabled
> Pid namespace: enabled
> User namespace: enabled
> Network namespace: enabled
> Multiple /dev/pts instances: enabled
>
> --- Control groups ---
> Cgroup: enabled
> Cgroup clone_children flag: enabled
> Cgroup device: enabled
> Cgroup sched: enabled
> Cgroup cpu account: enabled
> Cgroup memory controller: enabled
> Cgroup cpuset: enabled
>
> --- Misc ---
> Veth pair device: enabled
> Macvlan: enabled
> Vlan: enabled
> File capabilities: enabled
>
>
> # cat /var/lib/lxc/vs0/config
> # Template used to create this container: slackware
> # Template script checksum (SHA-1):
> 54f35064852a068c7ed1d0ae5e4b3ac8200ac790
>
> lxc.network.type = empty
>
>
> lxc.utsname = vs0
>
> lxc.mount = /var/lib/lxc/vs0/rootfs/etc/fstab
>
> lxc.tty = 4
> lxc.pts = 1024
> lxc.rootfs = /var/lib/lxc/vs0/rootfs
>
> lxc.cgroup.devices.deny = a
> # /dev/null and zero
> lxc.cgroup.devices.allow = c 1:3 rwm
> lxc.cgroup.devices.allow = c 1:5 rwm
> # consoles
> lxc.cgroup.devices.allow = c 5:1 rwm
> lxc.cgroup.devices.allow = c 5:0 rwm
> lxc.cgroup.devices.allow = c 4:0 rwm
> lxc.cgroup.devices.allow = c 4:1 rwm
> # /dev/{,u}random
> lxc.cgroup.devices.allow = c 1:9 rwm
> lxc.cgroup.devices.allow = c 1:8 rwm
> lxc.cgroup.devices.allow = c 136:* rwm
> lxc.cgroup.devices.allow = c 5:2 rwm
> # rtc
> lxc.cgroup.devices.allow = c 254:0 rwm
>
> # we don't trust root user in the container, better safe than sorry.
> # comment out only if you know what you're doing.
> lxc.cap.drop = sys_module mknod
> lxc.cap.drop = mac_override  kill sys_time
> lxc.cap.drop = setfcap setpcap sys_boot
>
> # if you want to be even more restrictive with your container's root
> # user comment the three lines above and uncomment the following one
> # lxc.cap.drop=sys_admin
>
>
> # cat /var/lib/lxc/vs0/rootfs/etc/fstab
> lxcpts /var/lib/lxc/vs0/rootfs/dev/pts devpts defaults,newinstance 0 0
> none /var/lib/lxc/vs0/rootfs/proc    proc   defaults 0 0
> none /var/lib/lxc/vs0/rootfs/sys     sysfs  defaults 0 0
> none /dev/shm tmpfs  defaults 0 0
>
>
> # mount | grep cgroup
> cgroup on /cgroup type cgroup (rw)
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