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1 | How to Use Open vSwitch with Libvirt |
2 | ==================================== | |
3 | ||
4 | This document describes how to use Open vSwitch with Libvirt 0.9.11 or | |
5 | later. The Open vSwitch support in Libvirt 0.9.11 eliminates the need to | |
6 | use OVS Linux Bridge compatibility layer (brcompatd) and interface up/down | |
7 | scripts. This document assumes that you followed INSTALL.Linux or installed | |
8 | Open vSwitch from distribution packaging such as a .deb or .rpm. The Open | |
9 | vSwitch support is included by default in Libvirt 0.9.11. Consult | |
10 | www.libvirt.org for instructions on how to build the latest Libvirt, if your | |
11 | Linux distribution by default comes with an older Libvirt release. | |
12 | ||
13 | Limitations | |
14 | ----------- | |
15 | Currently there is no Open vSwitch support for networks that are managed | |
16 | by libvirt (e.g. NAT). As of now, only bridged networks are supported (those | |
17 | where the user has to manually create the bridge). | |
18 | ||
19 | Setup | |
20 | ----- | |
21 | ||
22 | First, create the Open vSwitch bridge by using the ovs-vsctl utility (this | |
23 | must be done with administrative privileges): | |
24 | ||
25 | % ovs-vsctl add-br ovsbr | |
26 | ||
27 | Once that is done, create a VM, if necessary, and edit its Domain XML file: | |
28 | ||
29 | % virsh edit <vm> | |
30 | ||
31 | Lookup in the Domain XML file the <interface> section. There should be one | |
32 | such XML section for each interface the VM has. | |
33 | ||
34 | ... | |
35 | <interface type='network'> | |
36 | <mac address='52:54:00:71:b1:b6'/> | |
37 | <source network='default'/> | |
38 | <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> | |
39 | </interface> | |
40 | ... | |
41 | ||
42 | And change it to something like this: | |
43 | ||
44 | ... | |
45 | <interface type='bridge'> | |
46 | <mac address='52:54:00:71:b1:b6'/> | |
47 | <source bridge='ovsbr'/> | |
48 | <virtualport type='openvswitch'/> | |
49 | <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> | |
50 | </interface> | |
51 | ... | |
52 | ||
53 | The interface type must be set to "bridge". The <source> XML element | |
54 | specifies to which bridge this interface will be attached to. The | |
55 | <virtualport> element indicates that the bridge in <source> element is an | |
56 | Open vSwitch bridge. | |
57 | ||
58 | Then (re)start the VM and verify if the guest's vnet interface is attached to | |
59 | the ovsbr bridge. | |
60 | ||
61 | % ovs-vsctl show | |
62 | ||
63 | Troubleshooting | |
64 | --------------- | |
65 | If the VM does not want to start, then try to run the libvirtd process either | |
66 | from the terminal, so that all errors are printed in console, or inspect | |
67 | Libvirt/Open vSwitch log files for possible root cause. | |
68 | ||
69 | Bug Reporting | |
70 | ------------- | |
71 | ||
72 | Please report problems to bugs@openvswitch.org. |