Re: [Libvir] [RFC] 0/3 Add Linux Container support to libvirt
On Wed, Feb 20, 2008 at 10:24:18PM -0800, Dave Leskovec wrote:
The following set of patches add the first batch of linux container
support to libvirt. The work is not complete but I wanted to start
getting some of this out for comments. This set of patches supports the
following:
* new switch --with-lxc to enable linux container support (off by default)
* virConnectOpen
* virConnectClose
* virConnectListDomains (of course none are listed since we can't start
the containers yet)
* virConnectNumOfDomains
* virConnectListDefinedDomains
* virConnectNumOfDefinedDomains
* virDomainLookupByUUID
* virDomainLookupByName
* virDomainGetInfo
* virDomainGetXMLDesc
* virDomainDefineXML
* virDomainUndefine
A sample XML format that can be used to define a linux container domain:
<domain type='linuxcontainer'>
<name>TestContainer3</name>
<container>
<filesystem type='mount'>
<source dir='/home/user/lxc_files/etc/'/>
<target dir='/etc/'/>
</filesystem>
<filesystem type='mount'>
<source dir='/home/user/lxc_files/var/'/>
<target dir='/var/'/>
</filesystem>
<init>/usr/sbin/container_init</init>
</container>
<memory>65536</memory>
<devices>
<console tty='/dev/pts/4'/>
</devices>
</domain>
Having thought about this all since our previous round of discussions on
the matter I'm of the opinion we should /not/ use the <container> block
for filesystem setup - it should be part of the <devices> block. This will
simplify impl for apps which already have support for dealing with devices
and hot add/remove (virDomainAttachDevice/virDomainDetachDevice). The
<init> element can stay in <container> or perhap go inside an <os>
block
since that's where we describe booting for non-container virt.
WRT to OpenVZ driver already using <container> we can change it to follow
the new style - if we need compat we can let it continue to parse the old
style too.
Dan.
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