[lxc-users] How do you mount this file as an lxc rootfs?

[John Lewis]

On 06/20/2016 10:34 AM, Mike Wright wrote:
> On 06/20/2016 07:22 AM, John Lewis wrote:
>> On 06/20/2016 10:04 AM, Mike Wright wrote:
>>> On 06/20/2016 06:47 AM, John Lewis wrote:
>>>> I have a ext4 formatted file called pmd.simg with a directory
>>>> structure
>>>> like this.
>>>>
>>>> lost+found  rootfs
>>>
>>> You should be able to mount that via the loop device:
>>>
>>> <code>
>>> mount pmd.simg <mount_point> -o loop
>>> </code>
>>>
>>> Then rootfs will be available at <mount_point>/rootfs
>>>
>> Sorry I think I spoke too soon. Is there any way to do this inside the
>> lxc container configuration file?
>>
> I may be out of my league here but you could try using a pre-start hook.
>
> Put your mount command into a shell script and then invoke it from
> your config file:
>
> lxc.hook.pre-start = <path to mount script>
>
> Hope that works.
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I don't understand how it worked, but it did. The pmd directory is
empty, but the lxc is running. The loop device removes itself after I
stop the lxc. The /usr/lib/x86_64-linux-gnu/lxc/rootfs/ has a readme file.

    lxc-start 1466435077.780 INFO     lxc_conf - Executing script
'/var/lib/lxc/pmd/pre-mount.sh' for container 'pmd', config section 'lxc'

      lxc-start 1466435077.788 DEBUG    lxc_conf - mounted
'/home/diskimg/lxc/pmd/rootfs' on '/usr/lib/x86_64-linux-gnu/lxc/rootfs'

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