Sean, CloudStack let's you create instances with the same name, even in the same account, as long as they are on different networks.
I note you want to prevent this across two different zones, but as Zones are effectively autonomous, only sharing the management layer, I'm sure this will be impossible. Regards Geoff Higginbottom CTO / Cloud Architect D: +44 20 3603 0542<tel:+442036030542> | S: +44 20 3603 0540<tel:+442036030540> | M: +447968161581<tel:+447968161581> geoff.higginbot...@shapeblue.com<mailto:geoff.higginbot...@shapeblue.com> | www.shapeblue.com ShapeBlue Ltd, 53 Chandos Place, Covent Garden, London, WC2N 4HS On 19 Aug 2013, at 06:40, "Sean Hamilton" <s...@seanhamilton.co.uk<mailto:s...@seanhamilton.co.uk>> wrote: Hi all, I'm hoping that you could shed some light onto an issue I've been having. I have two zones in one region both zones have the same "Network Domain" setting of: zone1.local. I thought that this would be enough to stop instances with the same name being created in both zones, but it doesn't seem to be working. Has anyone successfully used the Network Domain settings at the network or zone level to prevent duplicate instance names? Thanks, Sean This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of Shape Blue Ltd or related companies. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue Services India LLP is operated under license from Shape Blue Ltd. ShapeBlue is a registered trademark.