Hi!
First post, kind of a noobie. I've been working with LXC and libvirt for a
few months now. Trying to do some interesting things with containers and
Android devices :D
I'm running ubuntu 13.10 with LXC 1.0.1 and tried both libvirt 1.1.1 and
1.2.2 (backported from ubuntu-trusty), but with either version of libvirt
am getting issues as soon as I try to get access to USB devices inside the
container.
Relevant versions of stuff:
$ dpkg -l | grep -i lxc
ii liblxc1 1.0.1-0ubuntu1~ubuntu13.10.1~ppa1
i386 Linux Containers userspace tools (library)
ii lxc 1.0.1-0ubuntu1~ubuntu13.10.1~ppa1
i386 Linux Containers userspace tools
ii lxc-templates 1.0.1-0ubuntu1~ubuntu13.10.1~ppa1
i386 Linux Containers userspace tools (templates)
ii python3-lxc 1.0.1-0ubuntu1~ubuntu13.10.1~ppa1
i386 Linux Containers userspace tools (Python 3.x bindings)
$ dpkg -l | grep libvirt
ii libvirt-bin 1.2.2-0ubuntu12
i386 programs for the libvirt library
ii libvirt0 1.2.2-0ubuntu12
i386 library for interfacing with different virtualization systems
ii python-libvirt 1.2.2-0ubuntu1
i386 libvirt Python bindings
Here's my entire domain definition:
<domain type='lxc'>
<name>oshi32134</name>
<uuid>xxxxx</uuid>
<memory unit='KiB'>3145728</memory>
<currentMemory unit='KiB'>3145728</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='i686'>exe</type>
<init>/sbin/init</init>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/lib/libvirt/libvirt_lxc</emulator>
<filesystem type='mount' accessmode='passthrough'>
<source dir='/some/valid/filesystem/location'/>
<target dir='/'/>
</filesystem>
<filesystem type='mount' accessmode='passthrough'>
<source dir='/another/valid/filesystem/location'/>
<target dir='/mnt/android'/>
</filesystem>
<interface type='bridge'>
<mac address='xx:xx:xx:xx:xx:xx'/>
<source bridge='br1'/>
</interface>
<console type='pty'>
<target type='lxc' port='0'/>
</console>
<hostdev mode='capabilities' type='misc'>
<source>
<char>/dev/kvm</char>
</source>
</hostdev>
<hostdev mode='subsystem' type='usb' managed='yes'>
<source>
<vendor id='0x04e8'/>
<product id='0x6860'/>
</source>
</hostdev>
</devices>
</domain>
Everything worked fine until I added the USB <hostdev> element. I'm
essentially trying to get access to a physical Android device connected to
the host from inside a container. When I go to start the container, I get
an error about Operation not permitted. Here's the relevant bits from
/var/log/libvirt/lxc/machine.log:
2014-04-11 22:46:40.491+0000: starting up
PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
LIBVIRT_DEBUG=3 LIBVIRT_LOG_OUTPUTS=3:stderr /usr/lib/libvirt/libvirt_lxc
--name oshi32134 --console 24 --security=none --handshake 27 --background
--veth vnet1
2014-04-11 22:46:40.597+0000: 685: info : libvirt version: 1.2.2
2014-04-11 22:46:40.597+0000: 685: error :
virLXCControllerSetupHostdevSubsysUSB:1390 : Unable to create device
//var/run/libvirt/lxc/oshi32134.dev/bus/usb//002//003: Operation not
permitted
Unable to create device
//var/run/libvirt/lxc/oshi32134.dev/bus/usb//002//003: Operation not
permitted
I get the same output above when I use libvirt 1.1.1.
Tracing down through the libvirt code it looks like it fails when calling
`mknod`. It's clear that libvirt converts the product/vendor ids I
specified in the domain definition file to the appropriate USB bus
(/dev/bus/usb/002/003, verified by comparing against output of
`usb-devices`).
In a parallel effort, a colleague of mine set up a vanilla LXContainer on a
new install of the same version of ubuntu, and successfully was able to
communicate with the Android device from a container. The only
configuration tweaks he made was make sure to whitelist the cgroup with the
appropriate major/minor device number (associated with the Android device)
inside the LXC configuration file. From there the container was able to
appropriately create the device file as you attach/detach the Android
device.
Hopefully someone can shed some light, and appreciate your patience with me
as I am learning a lot of this stuff as I go :)
Thanks in advance for any help!
Fil
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