[libvirt-users] [libvirt] a question about sanlock

[Daniel P. Berrange]

On Wed, Feb 22, 2012 at 02:04:09AM -0500, Alex Jia wrote:
> Hi Daniel,
> I got a question about lock manager, if I enable 'sanlock' in qemu.conf and
> uncomment 'auto_disk_leases = 1' in qemu-sanlock.conf then restart libvirtd 
> service, libvirtd will be dead, I know I should also uncomment 'host_id = 1' 
> in qemu-sanlock.conf, because I enable 'auto_disk_leases'. The question is
> the libvirtd must die due to a error users configuration? or could we give 
> some warning information instead of libvirtd die? 

I think this is a safety issue - if someone is deploying libvirt in an
scenario where they want locking, then we must be very careful not to
accidentally run without locking. So if someone accidentally mis-configures
one of their libvirtd instances to not have any host_id parameter, I felt
the only safe thing todo was to exit. An alternative would be to allow
libvirtd to start, but then make sure it refuses to start any guests.
I'm happy to take patches for the latter if someone wants to...

Daniel
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