1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
|
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<!--
This file is autogenerated from drvxen.html.in
Do not edit this file. Changes will be lost.
-->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<link rel="stylesheet" type="text/css" href="main.css" />
<link rel="SHORTCUT ICON" href="32favicon.png" />
<title>libvirt: Xen hypervisor driver</title>
<meta name="description" content="libvirt, virtualization, virtualization API" />
</head>
<body>
<div id="header">
<div id="headerLogo"></div>
<div id="headerSearch">
<form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><div>
<input id="query" name="query" type="text" size="12" value="" />
<input id="submit" name="submit" type="submit" value="Search" />
</div></form>
</div>
</div>
<div id="body">
<div id="menu">
<ul class="l0"><li>
<div>
<a title="Front page of the libvirt website" class="inactive" href="index.html">Home</a>
</div>
</li><li>
<div>
<a title="Details of new features and bugs fixed in each release" class="inactive" href="news.html">News</a>
</div>
</li><li>
<div>
<a title="Get the latest source releases, binary builds and get access to the source repository" class="inactive" href="downloads.html">Downloads</a>
</div>
</li><li>
<div>
<a title="Information for users, administrators and developers" class="active" href="docs.html">Documentation</a>
<ul class="l1"><li>
<div>
<a title="Information about deploying and using libvirt" class="inactive" href="deployment.html">Deployment</a>
</div>
</li><li>
<div>
<a title="Overview of the logical subsystems in the libvirt API" class="inactive" href="intro.html">Architecture</a>
</div>
</li><li>
<div>
<a title="Description of the XML formats used in libvirt" class="inactive" href="format.html">XML format</a>
</div>
</li><li>
<div>
<a title="Hypervisor specific driver information" class="active" href="drivers.html">Drivers</a>
<ul class="l2"><li>
<div>
<span class="active">Xen</span>
</div>
</li><li>
<div>
<a title="Driver for QEMU, KQEMU, KVM and Xenner" class="inactive" href="drvqemu.html">QEMU / KVM</a>
</div>
</li><li>
<div>
<a title="Driver for the Linux native container API" class="inactive" href="drvlxc.html">Linux Container</a>
</div>
</li><li>
<div>
<a title="Psuedo-driver simulating APIs in memory for test suites" class="inactive" href="drvtest.html">Test</a>
</div>
</li><li>
<div>
<a title="Driver providing secure remote to the libvirt APIs" class="inactive" href="drvremote.html">Remote</a>
</div>
</li><li>
<div>
<a title="Driver for the OpenVZ container technology" class="inactive" href="drvopenvz.html">OpenVZ</a>
</div>
</li><li>
<div>
<a title="Driver for the storage management APIs" class="inactive" href="storage.html">Storage</a>
</div>
</li></ul>
</div>
</li><li>
<div>
<a title="Reference manual for the C public API" class="inactive" href="html/index.html">API reference</a>
</div>
</li><li>
<div>
<a title="Bindings of the libvirt API for other languages" class="inactive" href="bindings.html">Language bindings</a>
</div>
</li></ul>
</div>
</li><li>
<div>
<a title="User contributed content" class="inactive" href="http://wiki.libvirt.org">Wiki</a>
</div>
</li><li>
<div>
<a title="Frequently asked questions" class="inactive" href="FAQ.html">FAQ</a>
</div>
</li><li>
<div>
<a title="How and where to report bugs and request features" class="inactive" href="bugs.html">Bug reports</a>
</div>
</li><li>
<div>
<a title="How to contact the developers via email and IRC" class="inactive" href="contact.html">Contact</a>
</div>
</li><li>
<div>
<a title="Miscellaneous links of interest related to libvirt" class="inactive" href="relatedlinks.html">Related Links</a>
</div>
</li><li>
<div>
<a title="Overview of all content on the website" class="inactive" href="sitemap.html">Sitemap</a>
</div>
</li></ul>
</div>
<div id="content">
<h1>Xen hypervisor driver</h1>
<p>
The libvirt Xen driver provides the ability to manage virtual machines
on any Xen release from 3.0.1 onwards.
</p>
<h2>Deployment pre-requisites</h2>
<p>
The libvirt Xen driver uses a combination of channels to manage Xen
virtual machines.
</p>
<ul><li>
<strong>XenD</strong>: Access to the Xen daemon is a mandatory
requirement for the libvirt Xen driver. It requires that the UNIX
socket interface be enabled in the <code>/etc/xen/xend-config.sxp</code>
configuration file. Specifically the config settings
<code>(xend-unix-server yes)</code>. This path is usually restricted
to only allow the <code>root</code> user access. As an alternative,
the HTTP interface can be used, however, this has significant security
implications.
</li><li>
<strong>XenStoreD</strong>: Access to the Xenstore daemon enables
more efficient codepaths for looking up domain information which
lowers the CPU overhead of management.
</li><li>
<strong>Hypercalls</strong>: The ability to make direct hypercalls
allows the most efficient codepaths in the driver to be used for
monitoring domain status.
</li><li>
<strong>XM config</strong>: When using Xen releases prior to 3.0.4,
there is no inactive domain management in XenD. For such releases,
libvirt will automatically process XM configuration files kept in
the <code>/etc/xen</code> directory. It is important not to place
any other non-config files in this directory.
</li></ul>
<h2>
<a name="xmlconfig" id="xmlconfig">Example domain XML config</a>
</h2>
<p>
Below are some example XML configurations for Xen guest domains.
For full details of the available options, consult the <a href="formatdomain.html">domain XML format</a>
guide.
</p>
<h3>Paravirtualized guest bootloader</h3>
<p>
Using a bootloader allows a paravirtualized guest to be booted using
a kernel stored inside its virtual disk image
</p>
<pre><domain type='xen' >
<name>fc8</name>
<bootloader>/usr/bin/pygrub</bootloader>
<os>
<type>linux</type>
</os>
<memory>131072</memory>
<vcpu>1</vcpu>
<devices>
<disk type='file'>
<source file='/var/lib/xen/images/fc4.img'/>
<target dev='sda1'/>
</disk>
<interface type='bridge'>
<source bridge='xenbr0'/>
<mac address='aa:00:00:00:00:11'/>
<script path='/etc/xen/scripts/vif-bridge'/>
</interface>
<console tty='/dev/pts/5'/>
</devices>
</domain></pre>
<h3>Paravirtualized guest direct kernel boot</h3>
<p>
For installation of paravirtualized guests it is typical to boot the
domain using a kernel and initrd stored in the host OS
</p>
<pre><domain type='xen' >
<name>fc8</name>
<os>
<type>linux</type>
<kernel>/var/lib/xen/install/vmlinuz-fedora8-x86_64</kernel>
<initrd>/var/lib/xen/install/initrd-vmlinuz-fedora8-x86_64</initrd>
<cmdline> kickstart=http://example.com/myguest.ks </cmdline>
</os>
<memory>131072</memory>
<vcpu>1</vcpu>
<devices>
<disk type='file'>
<source file='/var/lib/xen/images/fc4.img'/>
<target dev='sda1'/>
</disk>
<interface type='bridge'>
<source bridge='xenbr0'/>
<mac address='aa:00:00:00:00:11'/>
<script path='/etc/xen/scripts/vif-bridge'/>
</interface>
<graphics type='vnc' port='-1'/>
<console tty='/dev/pts/5'/>
</devices>
</domain></pre>
<h3>Fullyvirtualized guest BIOS boot</h3>
<p>
Fullyvirtualized guests use the emulated BIOS to boot off the primary
harddisk, CDROM or Network PXE ROM.
</p>
<pre><domain type='xen' id='3'>
<name>fv0</name>
<uuid>4dea22b31d52d8f32516782e98ab3fa0</uuid>
<os>
<type>hvm</type>
<loader>/usr/lib/xen/boot/hvmloader</loader>
<boot dev='hd'/>
</os>
<memory>524288</memory>
<vcpu>1</vcpu>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<features>
<pae/>
<acpi/>
<apic/>
</features>
<clock sync="localtime"/>
<devices>
<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
<interface type='bridge'>
<source bridge='xenbr0'/>
<mac address='00:16:3e:5d:c7:9e'/>
<script path='vif-bridge'/>
</interface>
<disk type='file'>
<source file='/var/lib/xen/images/fv0'/>
<target dev='hda'/>
</disk>
<disk type='file' device='cdrom'>
<source file='/var/lib/xen/images/fc5-x86_64-boot.iso'/>
<target dev='hdc'/>
<readonly/>
</disk>
<disk type='file' device='floppy'>
<source file='/root/fd.img'/>
<target dev='fda'/>
</disk>
<graphics type='vnc' port='5904'/>
</devices>
</domain></pre>
<h3>Fullyvirtualized guest direct kernel boot</h3>
<p>
With Xen 3.2.0 or later it is possible to bypass the BIOS and directly
boot a Linux kernel and initrd as a fullyvirtualized domain. This allows
for complete automation of OS installation, for example using the Anaconda
kickstart support.
</p>
<pre><domain type='xen' id='3'>
<name>fv0</name>
<uuid>4dea22b31d52d8f32516782e98ab3fa0</uuid>
<os>
<type>hvm</type>
<loader>/usr/lib/xen/boot/hvmloader</loader>
<kernel>/var/lib/xen/install/vmlinuz-fedora8-x86_64</kernel>
<initrd>/var/lib/xen/install/initrd-vmlinuz-fedora8-x86_64</initrd>
<cmdline> kickstart=http://example.com/myguest.ks </cmdline>
</os>
<memory>524288</memory>
<vcpu>1</vcpu>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<features>
<pae/>
<acpi/>
<apic/>
</features>
<clock sync="localtime"/>
<devices>
<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
<interface type='bridge'>
<source bridge='xenbr0'/>
<mac address='00:16:3e:5d:c7:9e'/>
<script path='vif-bridge'/>
</interface>
<disk type='file'>
<source file='/var/lib/xen/images/fv0'/>
<target dev='hda'/>
</disk>
<disk type='file' device='cdrom'>
<source file='/var/lib/xen/images/fc5-x86_64-boot.iso'/>
<target dev='hdc'/>
<readonly/>
</disk>
<disk type='file' device='floppy'>
<source file='/root/fd.img'/>
<target dev='fda'/>
</disk>
<graphics type='vnc' port='5904'/>
</devices>
</domain></pre>
</div>
</div>
<div id="footer">
<p id="sponsor">
Sponsored by:<br /><a href="http://et.redhat.com/"><img src="et.png" alt="Project sponsored by Red Hat Emerging Technology" /></a></p>
</div>
</body>
</html>
|
