Re: [Xen-users] RE: xend stop doesn't call network-script stop

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Tue, May 15, 2007 at 03:51:03PM +0200, Schober Walter wrote:
> Attached my network-bridge-bonding script, if helpful for someone. 
>  
> Is it normal, that 
> root      5450     1  0 03:12 ?        00:00:00 python /usr/sbin/xend
> start
> root      5453  5450  0 03:12 ?        00:00:00 python /usr/sbin/xend
> start
> stays running that way?

Yes, the parent process is a 'guardian angel' so to speak, while the
second is the actual XenD server. The former will restart the latter
if it crashes. 

> Any other hint, why 'service xend stop' doens't call the script?
>  
> I'm about to believe, that this isn't really interesting thus no one
> really cares about to get the "stop" working, too.
> My scripts work perfectly, if called in the shell.

Having  'service xend start' futz around with networking is (reasonably)
safe because at the time you boot most apps[1] won't be using networking
so their connectivity won't be disrupted. If you call 'service xend start'
multiple times the subsequent times will be no-op.  If 'service xend stop'
were to call network-bridge to shutdown networking then this would cause
serious disruption to any apps using networking at the time.

To be honest, XenD has no business touching networking what-so-ever.
Even at boot time, this will totally hose your system if you are booting
of iSCSI or NFS root. Longer term, I'd like to see Xend's network-script 
going  away completely & with the setup  being left to the regular distro
provided networking scripts which are already capable of setting up far more
complex & interesting configurations in a safer manner.

Regards,
Dan.

[1] iSCSI / NFS boot being the counter-examples
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