2008-04-23 17:08:31 +00:00
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<h1>LXC container driver</h1>
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2009-04-15 20:00:29 +00:00
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<p>
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The libvirt LXC driver manages "Linux Containers". Containers are sets of processes
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with private namespaces which can (but don't always) look like separate machines, but
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do not have their own OS. Here are two example configurations. The first is a very
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light-weight "application container" which does not have it's own root image. You would
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start it using
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</p>
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<h3>Example config version 1</h3>
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<p></p>
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<pre>
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<domain type='lxc'>
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2009-11-13 23:09:20 +00:00
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<name>vm1</name>
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<memory>500000</memory>
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<os>
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<type>exe</type>
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<init>/bin/sh</init>
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</os>
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<vcpu>1</vcpu>
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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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<emulator>/usr/libexec/libvirt_lxc</emulator>
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<interface type='network'>
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<source network='default'/>
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</interface>
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<console type='pty' />
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</devices>
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2009-04-15 20:00:29 +00:00
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</domain>
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</pre>
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2010-06-15 22:46:21 +00:00
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<p>
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In the <emulator> element, be sure you specify the correct path
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to libvirt_lxc, if it does not live in /usr/libexec on your system.
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</p>
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2009-04-15 20:00:29 +00:00
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<p>
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The next example assumes there is a private root filesystem
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(perhaps hand-crafted using busybox, or installed from media,
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debootstrap, whatever) under /opt/vm-1-root:
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</p>
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<p></p>
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<pre>
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<domain type='lxc'>
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2009-11-13 23:09:20 +00:00
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<name>vm1</name>
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<memory>32768</memory>
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<os>
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<type>exe</type>
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<init>/init</init>
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</os>
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<vcpu>1</vcpu>
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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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<emulator>/usr/libexec/libvirt_lxc</emulator>
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<filesystem type='mount'>
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<source dir='/opt/vm-1-root'/>
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<target dir='/'/>
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</filesystem>
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<interface type='network'>
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<source network='default'/>
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</interface>
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<console type='pty' />
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</devices>
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2009-04-15 20:00:29 +00:00
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</domain>
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</pre>
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<p>
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In both cases, you can define and start a container using:</p>
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<pre>
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2009-04-17 15:34:53 +00:00
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virsh --connect lxc:/// define v1.xml
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2010-06-15 22:46:21 +00:00
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virsh --connect lxc:/// start vm1
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2009-04-15 20:00:29 +00:00
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</pre>
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and then get a console using:
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<pre>
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2010-06-15 22:46:21 +00:00
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virsh --connect lxc:/// console vm1
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2009-04-15 20:00:29 +00:00
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</pre>
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<p>Now doing 'ps -ef' will only show processes in the container, for
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2010-06-15 22:46:21 +00:00
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instance. You can undefine it using
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2009-04-15 20:00:29 +00:00
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</p>
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2010-06-15 22:46:21 +00:00
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<pre>
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virsh --connect lxc:/// undefine vm1
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</pre>
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2008-04-23 17:08:31 +00:00
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</body>
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</html>
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