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

[Bin Zhou]

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

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


The following are the cgroup related setup in the config before adding the new line. Is the dev loop conflict with the existing one? 
# uncomment the next line to run the container unconfined:
#lxc.aa_profile = unconfined

lxc.cgroup.devices.deny = a
# Allow any mknod (but not using the node)
lxc.cgroup.devices.allow = c *:* m
lxc.cgroup.devices.allow = b *:* m
# /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
#fuse
lxc.cgroup.devices.allow = c 10:229 rwm
#tun
lxc.cgroup.devices.allow = c 10:200 rwm
#full
lxc.cgroup.devices.allow = c 1:7 rwm
#hpet
lxc.cgroup.devices.allow = c 10:228 rwm
#kvm
lxc.cgroup.devices.allow = c 10:232 rwm

Thanks.
//Bin
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