[libvirt] [PATCH] add some text to http://libvirt.org/drvlxc.html

[Serge E. Hallyn]

--- drvlxc-orig.html    2009-04-15 09:36:48.000000000 -0500
+++ drvlxc.html 2009-04-15 09:44:27.000000000 -0500
@@ -140,7 +140,89 @@
       </div>
 
       <div id="content">
-        <h1>LXC container driver</h1>
+<h1>LXC container driver</h1>
+<p>
+The libvirt LXC driver manages "Linux Containers".  Containers are sets of 
processes
+with private namespaces which can (but don't always) look like separate 
machines, but
+do not have their own OS.  Here are two example configurations.  The first is 
a very
+light-weight "application container" which does not have it's own root image.  
You would
+start it using
+</p>
+
+<h3>Example config version 1</h3>
+<p>
+<pre>
+&lt;domain type='lxc'&gt;
+       &lt;name&gt;vm1&lt;/name&gt;
+       &lt;memory&gt;500000&lt;/memory&gt;
+       &lt;os&gt;
+               &lt;type&gt;exe&lt;/type&gt;
+               &lt;init&gt;/bin/sh&lt;/init&gt;
+       &lt;/os&gt;
+       &lt;vcpu&gt;1&lt;/vcpu&gt;
+       &lt;clock offset='utc'/&gt;
+       &lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;
+       &lt;on_reboot&gt;restart&lt;/on_reboot&gt;
+       &lt;on_crash&gt;destroy&lt;/on_crash&gt;
+       &lt;devices&gt;
+               &lt;emulator&gt;/usr/libexec/libvirt_lxc&lt;/emulator&gt;
+               &lt;interface type='network'&gt;
+                       &lt;source network='default'/&gt;
+               &lt;/interface&gt;
+               &lt;console type='pty' /&gt;
+       &lt;/devices&gt;
+&lt;/domain&gt;
+</pre>
+</p>
+
+<p>
+The next example assumes there is a private root filesystem
+(perhaps hand-crafted using busybox, or installed from media,
+debootstrap, whatever) under /opt/vm-1-root:
+</p>
+<p>
+<pre>
+&lt;domain type='lxc'&gt;
+       &lt;name&gt;vm1&lt;/name&gt;
+       &lt;memory&gt;32768&lt;/memory&gt;
+       &lt;os&gt;
+               &lt;type&gt;exe&lt;/type&gt;
+               &lt;init&gt;/init&lt;/init&gt;
+       &lt;/os&gt;
+       &lt;vcpu&gt;1&lt;/vcpu&gt;
+       &lt;clock offset='utc'/&gt;
+       &lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;
+       &lt;on_reboot&gt;restart&lt;/on_reboot&gt;
+       &lt;on_crash&gt;destroy&lt;/on_crash&gt;
+       &lt;devices&gt;
+               &lt;emulator&gt;/usr/libexec/libvirt_lxc&lt;/emulator&gt;
+               &lt;filesystem type='mount'&gt;
+                       &lt;source dir='/opt/vm-1-root'/&gt;
+                       &lt;target dir='/'/&gt;
+               &lt;/filesystem&gt;
+               &lt;interface type='network'&gt;
+                       &lt;source network='default'/&gt;
+               &lt;/interface&gt;
+               &lt;console type='pty' /&gt;
+       &lt;/devices&gt;
+&lt;/domain&gt;
+
+</pre>
+</p>
+
+<p>
+In both cases, you can define and start a container using:
+<pre>
+lxc --connect lxc:/// define v1.xml
+lxc --connect lxc:/// start v1.xml
+</pre>
+and then get a console  using:
+<pre>
+lxc --connect lxc:/// console v1
+</pre>
+Now doing 'ps -ef' will only show processes in the container, for
+instance.
+</p>
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