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239 lines
7.8 KiB
HTML
239 lines
7.8 KiB
HTML
<html>
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<body>
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<h1>Xen hypervisor driver</h1>
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<p>
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The libvirt Xen driver provides the ability to manage virtual machines
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on any Xen release from 3.0.1 onwards.
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</p>
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<h2>Deployment pre-requisites</h2>
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<p>
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The libvirt Xen driver uses a combination of channels to manage Xen
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virtual machines.
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</p>
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<ul>
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<li>
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<strong>XenD</strong>: Access to the Xen daemon is a mandatory
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requirement for the libvirt Xen driver. It requires that the UNIX
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socket interface be enabled in the <code>/etc/xen/xend-config.sxp</code>
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configuration file. Specifically the config settings
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<code>(xend-unix-server yes)</code>. This path is usually restricted
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to only allow the <code>root</code> user access. As an alternative,
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the HTTP interface can be used, however, this has significant security
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implications.
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</li>
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<li>
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<strong>XenStoreD</strong>: Access to the Xenstore daemon enables
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more efficient codepaths for looking up domain information which
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lowers the CPU overhead of management.
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</li>
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<li>
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<strong>Hypercalls</strong>: The ability to make direct hypercalls
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allows the most efficient codepaths in the driver to be used for
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monitoring domain status.
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</li>
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<li>
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<strong>XM config</strong>: When using Xen releases prior to 3.0.4,
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there is no inactive domain management in XenD. For such releases,
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libvirt will automatically process XM configuration files kept in
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the <code>/etc/xen</code> directory. It is important not to place
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any other non-config files in this directory.
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</li>
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</ul>
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<h2>Connections to Xen driver</h2>
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<p>
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The libvirt Xen driver is a single-instance privileged driver,
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with a driver name of 'xen'. Some example conection URIs for
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the libvirt driver are:
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</p>
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<pre>
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xen:/// (local access, direct)
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xen+unix:/// (local access, via daemon)
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xen://example.com/ (remote access, TLS/x509)
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xen+tcp://example.com/ (remote access, SASl/Kerberos)
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xen+ssh://root@example.com/ (remote access, SSH tunnelled)
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</pre>
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<h2><a name="xmlconfig">Example domain XML config</a></h2>
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<p>
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Below are some example XML configurations for Xen guest domains.
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For full details of the available options, consult the <a href="formatdomain.html">domain XML format</a>
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guide.
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</p>
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<h3>Paravirtualized guest bootloader</h3>
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<p>
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Using a bootloader allows a paravirtualized guest to be booted using
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a kernel stored inside its virtual disk image
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</p>
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<pre><domain type='xen' >
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<name>fc8</name>
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<bootloader>/usr/bin/pygrub</bootloader>
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<os>
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<type>linux</type>
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</os>
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<memory>131072</memory>
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<vcpu>1</vcpu>
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<devices>
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<disk type='file'>
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<source file='/var/lib/xen/images/fc4.img'/>
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<target dev='sda1'/>
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</disk>
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<interface type='bridge'>
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<source bridge='xenbr0'/>
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<mac address='aa:00:00:00:00:11'/>
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<script path='/etc/xen/scripts/vif-bridge'/>
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</interface>
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<console tty='/dev/pts/5'/>
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</devices>
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</domain></pre>
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<h3>Paravirtualized guest direct kernel boot</h3>
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<p>
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For installation of paravirtualized guests it is typical to boot the
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domain using a kernel and initrd stored in the host OS
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</p>
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<pre><domain type='xen' >
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<name>fc8</name>
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<os>
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<type>linux</type>
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<kernel>/var/lib/xen/install/vmlinuz-fedora8-x86_64</kernel>
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<initrd>/var/lib/xen/install/initrd-vmlinuz-fedora8-x86_64</initrd>
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<cmdline> kickstart=http://example.com/myguest.ks </cmdline>
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</os>
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<memory>131072</memory>
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<vcpu>1</vcpu>
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<devices>
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<disk type='file'>
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<source file='/var/lib/xen/images/fc4.img'/>
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<target dev='sda1'/>
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</disk>
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<interface type='bridge'>
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<source bridge='xenbr0'/>
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<mac address='aa:00:00:00:00:11'/>
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<script path='/etc/xen/scripts/vif-bridge'/>
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</interface>
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<graphics type='vnc' port='-1'/>
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<console tty='/dev/pts/5'/>
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</devices>
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</domain></pre>
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<h3>Fullyvirtualized guest BIOS boot</h3>
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<p>
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Fullyvirtualized guests use the emulated BIOS to boot off the primary
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harddisk, CDROM or Network PXE ROM.
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</p>
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<pre><domain type='xen' id='3'>
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<name>fv0</name>
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<uuid>4dea22b31d52d8f32516782e98ab3fa0</uuid>
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<os>
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<type>hvm</type>
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<loader>/usr/lib/xen/boot/hvmloader</loader>
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<boot dev='hd'/>
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</os>
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<memory>524288</memory>
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<vcpu>1</vcpu>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>restart</on_crash>
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<features>
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<pae/>
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<acpi/>
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<apic/>
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</features>
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<clock sync="localtime"/>
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<devices>
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<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
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<interface type='bridge'>
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<source bridge='xenbr0'/>
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<mac address='00:16:3e:5d:c7:9e'/>
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<script path='vif-bridge'/>
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</interface>
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<disk type='file'>
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<source file='/var/lib/xen/images/fv0'/>
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<target dev='hda'/>
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</disk>
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<disk type='file' device='cdrom'>
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<source file='/var/lib/xen/images/fc5-x86_64-boot.iso'/>
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<target dev='hdc'/>
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<readonly/>
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</disk>
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<disk type='file' device='floppy'>
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<source file='/root/fd.img'/>
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<target dev='fda'/>
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</disk>
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<graphics type='vnc' port='5904'/>
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</devices>
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</domain></pre>
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<h3>Fullyvirtualized guest direct kernel boot</h3>
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<p>
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With Xen 3.2.0 or later it is possible to bypass the BIOS and directly
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boot a Linux kernel and initrd as a fullyvirtualized domain. This allows
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for complete automation of OS installation, for example using the Anaconda
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kickstart support.
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</p>
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<pre><domain type='xen' id='3'>
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<name>fv0</name>
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<uuid>4dea22b31d52d8f32516782e98ab3fa0</uuid>
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<os>
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<type>hvm</type>
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<loader>/usr/lib/xen/boot/hvmloader</loader>
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<kernel>/var/lib/xen/install/vmlinuz-fedora8-x86_64</kernel>
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<initrd>/var/lib/xen/install/initrd-vmlinuz-fedora8-x86_64</initrd>
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<cmdline> kickstart=http://example.com/myguest.ks </cmdline>
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</os>
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<memory>524288</memory>
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<vcpu>1</vcpu>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>restart</on_crash>
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<features>
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<pae/>
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<acpi/>
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<apic/>
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</features>
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<clock sync="localtime"/>
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<devices>
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<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
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<interface type='bridge'>
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<source bridge='xenbr0'/>
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<mac address='00:16:3e:5d:c7:9e'/>
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<script path='vif-bridge'/>
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</interface>
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<disk type='file'>
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<source file='/var/lib/xen/images/fv0'/>
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<target dev='hda'/>
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</disk>
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<disk type='file' device='cdrom'>
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<source file='/var/lib/xen/images/fc5-x86_64-boot.iso'/>
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<target dev='hdc'/>
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<readonly/>
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</disk>
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<disk type='file' device='floppy'>
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<source file='/root/fd.img'/>
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<target dev='fda'/>
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</disk>
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<graphics type='vnc' port='5904'/>
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</devices>
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</domain></pre>
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</body>
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</html>
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