[libvirt] Intro to libvirt-TCK (Technology Compatibility Kit)

[Dale Bewley]

On Wed, 2009-04-08 at 19:32 +0100, Daniel P. Berrange wrote:
>    libvirt TCK  : Technology Compatibility Kit

Amazing :)

> Even these 4 simple proof of concept scripts have highlighted
> some horrible problems
> 
>  - The QEMU driver 'define domain' method doesn't check for name
>    or UUID uniqueness correctly (well, at all)
> 
>  - After starting an inactive domain, the remote driver does not
>    update the 'ID' field in the virDomainPtr
> 
>  - After destroying a active domain, the remote driver does not
>    update the 'ID' field in the virDomainPtr
> 
>  - When defining a persistent config for an already running domain
>    the Xen XM driver blows away the current 'ID' field for the
>    running domain, replacing it with -1.

I've seen this. I hope some fixes can be back-ported or are sufficiently
distinct that users can patch older libvirt releases.

Since I have non-HVM hardware and am using F8 for Xen, I often run into
a loss of state information about a domain in libvirt.
https://bugzilla.redhat.com/show_bug.cgi?id=453276

Restarting xend sometimes helps, but frequently winds up causing another
domain to show up as "unknown" in virsh and sometimes a domain will
crash. 

Working around virsh with xm start sometimes results in a domain that
will pause right after grub finishes, and once unpaused it will crash
very shortly after finishing bootup.
 
The workaround for that for that seems to be
 xm start -c domain
in another console
 xm unpause domain
login to the domain and immediately
  shutdown -r now
this reboot seems to reset something back to normal and allow the domain
to startup completely.

Boy, that was fun the first time it happened. :)