mirror of https://gitee.com/openkylin/libvirt.git
255 lines
8.8 KiB
XML
255 lines
8.8 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<body>
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<h1>Bhyve driver</h1>
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<ul id="toc"></ul>
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<p>
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Bhyve is a FreeBSD hypervisor. It first appeared in FreeBSD 10.0. However, it's
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recommended to keep tracking FreeBSD 10-STABLE to make sure all new features
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of bhyve are supported.
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In order to enable bhyve on your FreeBSD host, you'll need to load the <code>vmm</code>
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kernel module. Additionally, <code>if_tap</code> and <code>if_bridge</code> modules
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should be loaded for networking support.
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</p>
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<p>
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Additional information on bhyve could be obtained on <a href="http://bhyve.org/">bhyve.org</a>.
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</p>
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<h2><a name="uri">Connections to the Bhyve driver</a></h2>
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<p>
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The libvirt bhyve driver is a single-instance privileged driver. Some sample
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connection URIs are:
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</p>
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<pre>
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bhyve:///system (local access)
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bhyve+unix:///system (local access)
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bhyve+ssh://root@example.com/system (remote access, SSH tunnelled)
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</pre>
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<h2><a name="exconfig">Example guest domain XML configurations</a></h2>
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<h3>Example config</h3>
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<p>
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The bhyve driver in libvirt is in its early stage and under active development. So it supports
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only limited number of features bhyve provides.
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</p>
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<p>
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Note: in older libvirt versions, only a single network device and a single
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disk device were supported per-domain. However,
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<span class="since">since 1.2.6</span> the libvirt bhyve driver supports
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up to 31 PCI devices.
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</p>
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<p>
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Note: the Bhyve driver in libvirt will boot whichever device is first. If you
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want to install from CD, put the CD device first. If not, put the root HDD
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first.
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</p>
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<p>
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Note: Only the SATA bus is supported. Only <code>cdrom</code>- and
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<code>disk</code>-type disks are supported.
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</p>
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<pre>
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<domain type='bhyve'>
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<name>bhyve</name>
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<uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
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<memory>219136</memory>
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<currentMemory>219136</currentMemory>
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<vcpu>1</vcpu>
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<os>
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<type>hvm</type>
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</os>
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<features>
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<apic/>
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<acpi/>
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</features>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<disk type='file'>
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<driver name='file' type='raw'/>
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<source file='/path/to/bhyve_freebsd.img'/>
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<target dev='hda' bus='sata'/>
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</disk>
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<disk type='file' device='cdrom'>
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<driver name='file' type='raw'/>
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<source file='/path/to/cdrom.iso'/>
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<target dev='hdc' bus='sata'/>
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<readonly/>
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</disk>
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<interface type='bridge'>
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<model type='virtio'/>
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<source bridge="virbr0"/>
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</interface>
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</devices>
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</domain>
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</pre>
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<p>(The <disk> sections may be swapped in order to install from
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<em>cdrom.iso</em>.)</p>
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<h3>Example config (Linux guest)</h3>
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<p>
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Note the addition of <bootloader>.
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</p>
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<pre>
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<domain type='bhyve'>
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<name>linux_guest</name>
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<uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
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<memory>131072</memory>
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<currentMemory>131072</currentMemory>
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<vcpu>1</vcpu>
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<bootloader>/usr/local/sbin/grub-bhyve</bootloader>
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<os>
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<type>hvm</type>
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</os>
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<features>
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<apic/>
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<acpi/>
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</features>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<disk type='file' device='disk'>
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<driver name='file' type='raw'/>
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<source file='/path/to/guest_hdd.img'/>
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<target dev='hda' bus='sata'/>
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</disk>
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<disk type='file' device='cdrom'>
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<driver name='file' type='raw'/>
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<source file='/path/to/cdrom.iso'/>
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<target dev='hdc' bus='sata'/>
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<readonly/>
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</disk>
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<interface type='bridge'>
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<model type='virtio'/>
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<source bridge="virbr0"/>
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</interface>
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</devices>
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</domain>
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</pre>
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<h2><a name="usage">Guest usage / management</a></h2>
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<h3><a name="console">Connecting to a guest console</a></h3>
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<p>
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Guest console connection is supported through the <code>nmdm</code> device. It could be enabled by adding
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the following to the domain XML (<span class="since">Since 1.2.4</span>):
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</p>
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<pre>
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...
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<devices>
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<serial type="nmdm">
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<source master="/dev/nmdm0A" slave="/dev/nmdm0B"/>
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</serial>
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</devices>
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...</pre>
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<p>Make sure to load the <code>nmdm</code> kernel module if you plan to use that.</p>
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<p>
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Then <code>virsh console</code> command can be used to connect to the text console
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of a guest.</p>
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<p><b>NB:</b> Some versions of bhyve have a bug that prevents guests from booting
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until the console is opened by a client. This bug was fixed in FreeBSD
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<a href="http://svnweb.freebsd.org/changeset/base/262884">r262884</a>. If
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an older version is used, one either has to open a console manually with <code>virsh console</code>
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to let a guest boot or start a guest using:</p>
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<pre>start --console domname</pre>
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<p><b>NB:</b> An bootloader configured to require user interaction will prevent
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the domain from starting (and thus <code>virsh console</code> or <code>start
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--console</code> from functioning) until the user interacts with it manually on
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the VM host. Because users typically do not have access to the VM host,
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interactive bootloaders are unsupported by libvirt. <em>However,</em> if you happen to
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run into this scenario and also happen to have access to the Bhyve host
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machine, you may select a boot option and allow the domain to finish starting
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by using an alternative terminal client on the VM host to connect to the
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domain-configured null modem device. One example (assuming
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<code>/dev/nmdm0B</code> is configured as the slave end of the domain serial
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device) is:</p>
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<pre>cu -l /dev/nmdm0B</pre>
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<h3><a name="xmltonative">Converting from domain XML to Bhyve args</a></h3>
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<p>
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The <code>virsh domxml-to-native</code> command can preview the actual
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<code>bhyve</code> commands that will be executed for a given domain.
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It outputs two lines, the first line is a <code>bhyveload</code> command and
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the second is a <code>bhyve</code> command.
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</p>
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<p>Please note that the <code>virsh domxml-to-native</code> doesn't do any
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real actions other than printing the command, for example, it doesn't try to
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find a proper TAP interface and create it, like what is done when starting
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a domain; and always returns <code>tap0</code> for the network interface. So
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if you're going to run these commands manually, most likely you might want to
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tweak them.</p>
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<pre>
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# virsh -c "bhyve:///system" domxml-to-native --format bhyve-argv --xml /path/to/bhyve.xml
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/usr/sbin/bhyveload -m 214 -d /home/user/vm1.img vm1
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/usr/sbin/bhyve -c 2 -m 214 -A -I -H -P -s 0:0,hostbridge -s 3:0,virtio-net,tap0,mac=52:54:00:5d:74:e3 -s 2:0,virtio-blk,/home/user/vm1.img -s 1,lpc -l com1,/dev/nmdm0A vm1
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</pre>
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<h3><a name="zfsvolume">Using ZFS volumes</a></h3>
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<p>It's possible to use ZFS volumes as disk devices <span class="since">since 1.2.8</span>.
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An example of domain XML device entry for that will look like:</p>
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<pre>
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...
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<disk type='volume' device='disk'>
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<source pool='zfspool' volume='vol1'/>
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<target dev='vdb' bus='virtio'/>
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</disk>
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...</pre>
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<p>Please refer to the <a href="storage.html">Storage documentation</a> for more details on storage
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management.</p>
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<h3><a name="grubbhyve">Using grub2-bhyve or Alternative Bootloaders</a></h3>
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<p>It's possible to boot non-FreeBSD guests by specifying an explicit
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bootloader, e.g. <code>grub-bhyve(1)</code>. Arguments to the bootloader may be
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specified as well. If the bootloader is <code>grub-bhyve</code> and arguments
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are omitted, libvirt will try and infer boot ordering from user-supplied
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<boot order='N'> configuration in the domain. Failing that, it will boot
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the first disk in the domain (either <code>cdrom</code>- or
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<code>disk</code>-type devices). If the disk type is <code>disk</code>, it will
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attempt to boot from the first partition in the disk image.</p>
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<pre>
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...
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<bootloader>/usr/local/sbin/grub-bhyve</bootloader>
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<bootloader_args>...</bootloader_args>
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...
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</pre>
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<p>Caveat: <code>bootloader_args</code> does not support any quoting.
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Filenames, etc, must not have spaces or they will be tokenized incorrectly.</p>
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</body>
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</html>
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