[Libvir] [RFC] 0/3 Add Linux Container support to libvirt
Daniel P. Berrange
berrange at redhat.com
Thu Feb 21 14:51:12 UTC 2008
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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