Re: [Xen-devel] purpose of /var/lib/xend/state

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

On Fri, Dec 07, 2007 at 03:48:48PM +0000, John Levon wrote:
> 
> What are these XML files actually for? I don't understand why this
> information needs to persist - can somebody explain the reason?
> 
> When these files become corrupted for whatever reason, xend fails to
> start altogether. At the very least, this needs to be made more robust
> (I may work on a patch for this once I understand this stuff better).

Its a serious pain wrt to networking. At startup XenD scans all active
network interfaces and saves a record of them. Next-time you start XenD
it will re-create any that it previously saw.

This is exceedingly bad for interfaces/bridges managed by the distro
init scripts. eg, if I had a bridge configured and then remove its
config, XenD will now happily re-create this bridge itself.  I've got
a patch pending to make XenD leave any externally managed PIFs alone
only touching one it created itself via XenAPI

Dan.
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