[libvirt] Xen 4.1 misc issues
Roberto Sassu
roberto.sassu at polito.it
Wed Sep 11 12:50:33 UTC 2013
Hi everyone
I'm using Ubuntu 12.04.3 LTS with the Xen hypervisor
installed (package version: 4.1.2-2ubuntu2.10),
and Libvirt v0.10.2.2 (that interacts with Xen through
the libxl driver).
I performed some adjustments to have the required
features:
- Switch from Xend to libxl:
I created upstart jobs for xenstored and xenconsoled
so that necessary daemons are started earlier enough
and Libvirt can contact the hypervisor through libxl.
- Add support for Open vSwitch:
I added the script 'vif-openvswitch', taken from
the master branch of the GIT repository, to the
/etc/xen/scripts directory in order to plug network
interfaces to Open vSwitch switches.
I know that the support for libxl is experimental
in Xen 4.1, but I'm wondering if someone has a solution
to the following issues:
1) On domain destroy, the host configuration is not clean:
if the flag 'force' is set to 0 some entries in the
xenstored database are not removed (console, ...)
if the flag 'force' is set to 1 (as it is done
in Libvirt), the event 'online' associated to the
network interface is not triggered and, thus, the
vif is not removed from the Open vSwitch switch.
To fix this issue, I temporarily added a call
to vif-openvswitch into the xen-hotplug-cleanup script.
2) When a domain is started from Libvirt, the console
source path does not appear in the output of the
command 'virsh dumpxml instance-00000381'
3) Sometimes, a domU is not started at all. If I start
a virtual machine from Libvirt through virsh or directly
through xl, these tools report that the virtual machine
is running but I see no messages coming from the console
and the CPU time remains fixed.
I'm attaching some files that may be useful to understand
the problem:
- libvirt.xml: domain specifications (Libvirt format)
- domain.xl: domain specifications (Xen format)
- libvirt_virsh_dumpxml.log: output of the command
'virsh dumpxml instance-00000381'
- xl_create.log: output of the command 'xl create -d domain.xl'
- xl_info.log: output of the command 'xl info'
- qemu-dm-instance-00000381.log: qemu-dm log
- syslog_vif6_0.log: vif attach/detach logs from /var/log/syslog
- xenstore-db-not-clean.log: xenstore db entries not removed
after 'xl destroy'
- libvirt_libxl.log: log from /var/log/libvirt/libxl.log
after the execution of the command 'virsh create libvirt.xml'
Lastly, I want to add that the image I'm using for the tests
is Ubuntu Precise 12.04.3 LTS, taken from the URL:
http://cloud-images.ubuntu.com/precise/current/precise-server-cloudimg-amd64-disk1.img
and the kernel is taken from the URL:
http://cloud-images.ubuntu.com/precise/current/unpacked/precise-server-cloudimg-amd64-vmlinuz-virtual
Thanks
Roberto Sassu
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name = "instance-00000381"
uuid = "a65c782d-05fe-4c54-9911-8e7e4cb33244"
maxmem = 512
memory = 512
vcpus = 1
kernel = "/var/lib/nova/instances/instance-00000381/kernel"
extra = "ro root=/dev/xvda1"
localtime = 0
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "destroy"
vfb = [ "type=vnc,vncunused=1,vnclisten=node-110,keymap=en-us" ]
disk = [ "tap:raw:/var/lib/nova/instances/instance-00000381/disk,xvda,w" ]
vif = [ "mac=fa:16:3e:55:5d:e0,bridge=br-tvd-91970,script=vif-bridge" ]
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host : node-110
release : 3.2.0-40-ima
version : #64 SMP Tue Apr 9 14:21:15 CEST 2013
machine : x86_64
nr_cpus : 2
nr_nodes : 1
cores_per_socket : 2
threads_per_core : 1
cpu_mhz : 2128
hw_caps : bfebfbff:20100800:00000000:00000940:0000e3bd:00000000:00000001:00000000
virt_caps : hvm
total_memory : 2023
free_memory : 151
free_cpus : 0
xen_major : 4
xen_minor : 1
xen_extra : .2
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler : credit
xen_pagesize : 4096
platform_params : virt_start=0xffff800000000000
xen_changeset : unavailable
xen_commandline : placeholder
cc_compiler : gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
cc_compile_by : roberto.sassu
cc_compile_domain : polito.it
cc_compile_date : Fri Jul 26 11:33:14 CEST 2013
xend_config_format : 4
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