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

[Evgenii Shatokhin]

27.01.2016 19:08, Stanislav Kinsburskiy пишет:
>
>
> 27.01.2016 16:02, Evgenii Shatokhin пишет:
>> 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.
>>
>
> You can do it manually.
> There is a file:
>
> /sys/fs/cgroup/ve/c<CTID>/ve.sysfs_permissions
>
> which controls sysfs layout.
>
> Please, reply with results of:
>
> # ls -l /sys/dev/block/8:17
>
> I'll send you, what you have to write to this file.

Thanks for your help!

With libvzctl-7.0.172, vzctl set VEID --device-add <...> worked.

Now I am curious about these sysfs settings, just in case I will need do 
such things manually in the future.

Could you still explain what should be done there?

Here is the output you asked for:

# ls -l /sys/dev/block/8:17
lrwxrwxrwx 1 root root 0 Jan 27 12:26 /sys/dev/block/8:17 -> 
../../devices/pci0000:00/0000:00:0d.0/ata2/host1/target1:0:0/1:0:0:0/block/sdb/sdb1

# ls -l 
/sys/devices/pci0000:00/0000:00:0d.0/ata2/host1/target1:0:0/1:0:0:0/block/sdb/sdb1
total 0
-r--r--r-- 1 root root 4096 Jan 27 16:20 alignment_offset
-r--r--r-- 1 root root 4096 Jan 27 12:26 dev
-r--r--r-- 1 root root 4096 Jan 27 16:20 discard_alignment
drwxr-xr-x 2 root root    0 Jan 27 16:20 holders
-r--r--r-- 1 root root 4096 Jan 27 16:20 inflight
-r--r--r-- 1 root root 4096 Jan 27 12:26 partition
drwxr-xr-x 2 root root    0 Jan 27 16:20 power
-r--r--r-- 1 root root 4096 Jan 27 16:20 ro
-r--r--r-- 1 root root 4096 Jan 27 12:26 size
-r--r--r-- 1 root root 4096 Jan 27 12:26 start
-r--r--r-- 1 root root 4096 Jan 27 16:20 stat
lrwxrwxrwx 1 root root    0 Jan 27 12:26 subsystem -> 
../../../../../../../../../../class/block
drwxr-xr-x 2 root root    0 Jan 27 16:20 trace
-rw-r--r-- 1 root root 4096 Jan 27 12:26 uevent

Regards,
Evgenii