Re: [Xen-devel] EL6 initscript feedback.

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Tue, 21 May 2013 21:30:27 +1000, Steven Haigh <netwiz@xxxxxxxxx> 
wrote:
> On 05/21/2013 09:20 PM, Stefano Stabellini wrote:
> > On Tue, 21 May 2013, Steven Haigh wrote:
> > > Hi all,
> > >
> > > I'm throwing in my initscript here that I've been pushing to 
> > > autostart xen
> > > domains on system boot.
> > >
> > > There are at least one issue right now that I'm not 100% sure how 
> > > to handle -
> > > and that is domains created by libvirt. These continue to show in 
> > > an xm/xl
> > > list output even when they are not paused / running / blocked - 
> > > causing my
> > > initscript to think they are still running.
> > >
> > > The ways I can think of detecting this are *very* hacky and I 
> > > wouldn't feel
> > > comfortable to including them in widely used packages.
> > >
> > > I'm wondering if people have some spare time that they review the 
> > > logic in
> > > this initscript and provide feedback / suggestions / fixes / 
> > > improvements that
> > > I can roll into the scripts to enhance them for all.
> > Is it actually a good idea to mix and match different toolstacks on 
> > the
> > same host? If somebody intends to use libvirt, surely she would want 
> > to
> > use it for everything?
> This is the interesting question... which probably leads into a more
> important question... What is the best practices for config 
> management
> and defining configuration for DomU's?
>
> While I recommend that people use a plain text config file in
> /etc/xen (although really the files can be just about anywhere) and
> then links to various auto-start DomU's in /etc/xen/auto as a general
> rule.
>
> Am I correct in thinking that libvirt only keeps details of domains
> in the xenstore? Is this recommended? Although more a libvirt 
> question
> - can libvirt be configured to use config files in /etc/xen or
> similar?
I think this is largely distribution dependant. In the case of 
EL/Fedora,
libvirt seems to be the distro's intended way of managing VMs, at least 
for
their primary supported virtualization method (KVM).

In the interest of clarity and maintainability I have seen the light
and converted my VMs to simple text files in /etc/xen/ (there seems to 
be
no documentation on how to edit most of the settings in xenstore). Some
consensus on the best way would be good, though.

Gordan

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