libvirt users - Jan 2019 - LXC guest to have/make a device node (FUSE)

hi guys

With lxc container under libvirt control - how can guest create device
nodes?

I'm specifically looking for FUSE device. Is it possible somehow to get
it to the guest(passthrough?) or allow the guest to create dev node?

many thanks, L.

On Tue, Jan 22, 2019 at 03:25:10PM +0000, lejeczek
wrote:
> hi guys
> 
> With lxc container under libvirt control - how can guest create device
> nodes?
> 
> I'm specifically looking for FUSE device. Is it possible somehow to get
> it to the guest(passthrough?) or allow the guest to create dev node?
You can tell libvirt to create it using host device "passthrough" for
arbitrary block or character devices:

  https://libvirt.org/formatdomain.html#elementsHostDevCaps

Regards,
Daniel
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Hello

Device must be present on hardware node. For pass Character Device
inside lxc container:
<device>
  <hostdev mode='capabilities' type='misc'>
     <source>
       <char>/dev/CHAR_DEV_NAME</char>
     </source>
   </hostdev>
      .....
</device>

for Block Device:
<hostdev mode='capabilities' type='storage'>
   <source>
     <block>/dev/BLOCK_DEV_NAME</block>
   </source>
 </hostdev>

After LXC container start, corresponding device would be created
inside container's /dev/
Details here: https://libvirt.org/formatdomain.html#elementsHostDevCaps

b.r.
 Maxim Kozin