[Devel] [Q] Connecting a physical HDD/partition to a container

[Evgenii Shatokhin]

27.01.2016 16:38, Igor Sukhih пишет:
> On 01/27/2016 04:29 PM, Stanislav Kinsburskiу wrote:
>> 27 янв. 2016 г. 14:24 пользователь Evgenii Shatokhin
>> <eshatokhin at virtuozzo.com> написал:
>>> I created it with
>>> vzctl set 101 --devnodes sdb1:rw --save
>>>
>>> The node is now present in the CT. However, if I try to mount it in
>>> the CT (mount /dev/sdb1 /mnt), no error is reported but mount seems to
>>> have no effect. No files are seen in /mnt that are present on that
>>> partition.
>>>
>>> So, I guess, additional steps are needed?
>>>
>>>> You might need sysfs layout.
>>>> Please, strace your mount call and send it as a reply (attached).
>>>>
>>> Here it is.
>>>
>>> As far as I can see in strace log, mount tries to open
>>> /sys/dev/block/8:17, indeed. This file is present on the host but not in
>>> the CT.
>>>
>> Expectable.
>> Then you have to expose sysfs for this device to the container.
>> Igor, could you advice, please?
>>
>
> Lets try to use secondary disk feature first
>
> vzctl set VEID --device-add hdd --device /dev/sda --save

No luck. The CT fails to start with "Failed to configure disk" after that.

Details:
-------------------
[root at vz-test2]# vzctl set 101 --device-add hdd --device /dev/sdb --save
The device /dev/sdb uuid={d6f09c24-99f3-4ead-8504-4a8ff810490b} has been 
successfully added.

[root at vz-test2]# # vzctl start 101
Starting Container ...
Mount image: /vz/private/6bd8d99b-e20c-4204-931a-f12dea70ea95/root.hdd
Opening delta 
/vz/private/6bd8d99b-e20c-4204-931a-f12dea70ea95/root.hdd/root.hds
Adding delta dev=/dev/ploop41020 
img=/vz/private/6bd8d99b-e20c-4204-931a-f12dea70ea95/root.hdd/root.hds (rw)
Mounting /dev/ploop41020p1 at 
/vz/root/6bd8d99b-e20c-4204-931a-f12dea70ea95 fstype=ext4 
data='balloon_ino=12,pfcache_csum,,'
Container is mounted
Os release: 3.10.0-327.3.1.vz7.10.4
Create /etc/tmpfiles.d/device-ploop41020p1.conf
Setting permissions for 
image=/vz/private/6bd8d99b-e20c-4204-931a-f12dea70ea95/root.hdd
Setting permissions 104 dev 0xa030b6c1
Setting mount options for image=/dev/sdb opts=8:17;1 
balloon_ino=12,pfcache_csum,,
Setting permissions for image=/dev/sdb
Setting permissions 104 dev 0x811
Create /etc/tmpfiles.d/device-ploop1p1.conf
Can't open /sys/class/block/ploop1p1/uevent for writing: No such file or 
directory
Failed to configure disk
Cancel init execution
Unmount image: /vz/private/6bd8d99b-e20c-4204-931a-f12dea70ea95/root.hdd
Unmounting file system at /vz/root/6bd8d99b-e20c-4204-931a-f12dea70ea95
Unmounting device /dev/ploop41020
Container is unmounted
Failed to start the Container
-------------------

Regards,
Eugene