[lxc-users] loop device missing (needed for 'cryptmount')

[Serge Hallyn]

Quoting U.Mutlu (for-gmane at mutluit.com):
> Hi,
> I've a problem with missing loop devices (dev/loop*).
> The 'cryptmount' tool says that it needs such a loop device.
> 
> Using lxc-create I had created a debian (v7) vm. Host is also a debian (v8).
> On host the /dev/loop devices are present, but in container there is none.
> brw-rw---- 1 root disk  7,   0 Jan 27 02:38 /dev/loop0
> brw-rw---- 1 root disk  7,   1 Jan 27 02:38 /dev/loop1
> brw-rw---- 1 root disk  7,   2 Jan 27 02:38 /dev/loop2
> brw-rw---- 1 root disk  7,   3 Jan 27 02:38 /dev/loop3
> brw-rw---- 1 root disk  7,   4 Jan 27 02:38 /dev/loop4
> brw-rw---- 1 root disk  7,   5 Jan 27 02:38 /dev/loop5
> brw-rw---- 1 root disk  7,   6 Jan 27 02:38 /dev/loop6
> brw-rw---- 1 root disk  7,   7 Jan 27 02:38 /dev/loop7
> crw-rw---- 1 root disk 10, 237 Jan 27 02:38 /dev/loop-control
> 
> In /usr/share/lxc/config/debian.common.conf it says:
> 
> ## To use loop devices, copy the following line to the container's
> ## configuration file (uncommented).
> #lxc.cgroup.devices.allow = b 7:* rwm
> 
> So, I added the following to the lxc config file
> lxc.cgroup.devices.allow = b 7:* rwm
> 
> After restarting the container the /dev/loop* are still missing.
> How can I get the /dev/loop* created?

Just mknod them