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LXC: added some doc on domxml-from-native with mention of limitations

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Cédric Bosdonnat 2014-02-05 15:10:16 +01:00 committed by Daniel P. Berrange
parent a09bbc024d
commit f4b28d5c8a
1 changed files with 33 additions and 1 deletions
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docs/drvlxc.html.in
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@ -555,7 +555,7 @@ and LXC. For further details about usage of virsh consult its
manual page. manual page.
</p> </p>
<h3><a name="usageSave">Defining (saving) container configuration></a></h3> <h3><a name="usageSave">Defining (saving) container configuration</a></h3>
<p> <p>
The <code>virsh define</code> command takes an XML configuration The <code>virsh define</code> command takes an XML configuration
@ -702,5 +702,37 @@ host
# virt-top -c lxc:/// # virt-top -c lxc:///
</pre> </pre>
<h3><a name="usageConvert">Converting LXC container configuration</a></h3>
<p>
The <code>virsh domxml-from-native</code> command can be used to convert
most of the LXC container configuration into a domain XML fragment
</p>
<pre>
# virsh -c lxc:/// domxml-from-native lxc-tools /var/lib/lxc/myguest/config
</pre>
<p>
This conversion has some limitations due to the fact that the
domxml-from-native command output has to be independent of the host. Here
are a few things to take care of before converting:
</p>
<ul>
<li>
Replace the fstab file referenced by <tt>lxc.mount</tt> by the corresponding
lxc.mount.entry lines.
</li>
<li>
Replace all relative sizes of tmpfs mount entries to absolute sizes. Also
make sure that tmpfs entries all have a size option (default is 50%).
</li>
<li>
Define <tt>lxc.cgroup.memory.limit_in_bytes</tt> to properly limit the memory
available to the container. The conversion will use 64MiB as the default.
</li>
</ul>
</body> </body>
</html> </html>