[lxc-users] cannot enable dev loop access from LXC

Serge Hallyn serge.hallyn at ubuntu.com
Wed Sep 10 18:29:41 UTC 2014

Quoting Bin Zhou (lakerzhou at yahoo.com):
> Hi,
> I am trying to enable dev loop access in LXC and set up glusterFS server volume on the loop dev.
> I add the following line to /var/lib/lxc/local-server-7/config
>  lxc.cgroup.devices.allow = b 7:* rwm

Certainly looks fine.

> The container failed to start with the new config.
> ubuntu at bpcluster1:~$ sudo lxc-start -n local-server-7 
> lxc-start: write /sys/fs/cgroup/devices//lxc/local-server-7/devices.allow : Invalid argument
> lxc-start: failed to setup the cgroups for 'local-server-7'
> lxc-start: failed to setup the container
> lxc-start: invalid sequence number 1. expected 2
> lxc-start: failed to spawn 'local-server-7

Hm.  Can you cat /sys/fs/cgroup/devices/lxc/devices.list ?

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