Re: [libvirt] libvirt-libxl driver defaulting to tap disk and not working (ubuntu 12.10 + xen 4.5 + libvirt 1.2.3 + openstack)
Hi, Jim
The blktap seems not a module in xen 4.5, when I tried the load it , can not find the
module, is there something wrong I did?
BTW ,I compiled the xen4.5 by myself.
Thanks !
-----Original Message-----
From: Jim Fehlig [mailto:jfehlig@suse.com]
Sent: Friday, April 18, 2014 11:52 PM
To: Tian, Shuangtai
Cc: libvir-list(a)redhat.com
Subject: Re: [libvirt] libvirt-libxl driver defaulting to tap disk and not working (ubuntu
12.10 + xen 4.5 + libvirt 1.2.3 + openstack)
Tian, Shuangtai wrote:
HI
I am an openstacker, when I used the latest libvirt and xen code to
run the openstack. Can not create the vm.
there is an error in libxl log, you can see the log:
Os : Ubuntu 12.10
Compiled against library: libvirt 1.2.3
Using library: libvirt 1.2.3
Using API: Xen 1.2.3
Running hypervisor: Xen 4.5.0
libxl: debug: libxl_create.c:1356:do_domain_create: ao 0x7f7894002810:
create: how=(nil) callback=(nil) poller=0x7f7894001bb0
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk
vdev=xvda spec.backend=tap
libxl: debug: libxl_device.c:210:disk_try_backend: Disk vdev=xvda,
backend tap unsuitable because blktap not available
In addition to John's suggestions, try loading a blktap module in dom0.
It should work if a blktap driver is available.
Regards,
Jim
libxl: error: libxl_device.c:289:libxl__device_disk_set_backend: no
suitable backend for disk xvda
libxl: debug: libxl_event.c:1739:libxl__ao_complete: ao
0x7f7894002810: complete, rc=-3
libxl: debug: libxl_create.c:1370:do_domain_create: ao 0x7f7894002810:
inprogress: poller=0x7f7894001bb0, flags=ic
libxl: debug: libxl_event.c:1711:libxl__ao__destroy: ao
0x7f7894002810: destroy
The blktap does work, and I also find the same error someone has
posted,
(http://www.redhat.com/archives/libvir-list/2013-February/msg01124.htm
l)
When I change the type to “phy”, it also doesnot work. And try to
change the type to other options, also does not work.
Can someone give me some suggestions?
Thanks !
The XML from the openstack is :
<domain type="xen">
<uuid>9e9ed86c-8892-40da-acd1-31ec6303abfe</uuid>
<name>instance-00000001</name>
<memory>524288</memory>
<vcpu>1</vcpu>
<os>
<type>xen</type>
<kernel>/opt/stack/data/nova/instances/9e9ed86c-8892-40da-acd1-31ec630
3abfe/kernel</kernel>
<initrd>/opt/stack/data/nova/instances/9e9ed86c-8892-40da-acd1-31ec630
3abfe/ramdisk</initrd>
<cmdline>ro root=/dev/xvda</cmdline>
</os>
<features>
<acpi/>
<apic/>
</features>
<clock offset="utc"/>
<devices>
<disk type="file" device="disk">
<driver name="tap2" type="raw" cache="none"/>
<source
file="/opt/stack/data/nova/instances/9e9ed86c-8892-40da-acd1-31ec6303a
bfe/disk"/>
<target bus="xen" dev="xvda"/>
</disk>
<disk type="file" device="cdrom">
<driver name="tap2" type="raw" cache="none"/>
<source
file="/opt/stack/data/nova/instances/9e9ed86c-8892-40da-acd1-31ec6303a
bfe/disk.config"/>
<target bus="ide" dev="xvdd"/>
</disk>
<interface type="bridge">
<mac address="fa:16:3e:d8:c3:c0"/>
<source bridge="br100"/>
<filterref
filter="nova-instance-instance-00000001-fa163ed8c3c0"/>
</interface>
<console type="pty"/>
<graphics type="vnc" autoport="yes" keymap="en-us"
listen="127.0.0.1"/>
<video>
<model type="xen"/>
</video>
</devices>
</domain>
Best regards,
Tian, Shuangtai
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