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Comments
whichever you prefer
if my opinion matters, I say KVM
For a small project I'd go with OpenVZ
As many says KVM is 10-12% slower than OVZ.
So OVZ (its Cheap as well).
IMO, DNS server and reserve proxy do not need to use custom kernel, so i vote for OpenVZ
My advice is to use OpenVZ always, unless there's a compelling reason no to.
OVZ
I use low end openvz 512MB boxes for all 3 of my (powerdns) DNS servers and an openvz 1GB for my mail server.
Openvz or KVM really doesn't matter when you're using a VPS for a mail server or DNS server. The most important thing is choosing a provider that is reliable, has a reliable network, and doesn't have frequent outages/downtime/server reboots/oversold boxes that barely function.
I was thinking more KVM, but if OVZ is better i'll grab that.
ovz will do the job faster for less money, so...
You also dont need more than 256 ram for a dns and a small site.
As a real world example. I was looking to convert one name server from OpenVZ to KVM, mostly to provide better isolation. I'm reconsidering if its really worth it. The difference?
BIND9 server OVZ = 27 megabytes total usage (fully configured)
BIND9 server KVM = 148 megabytes (prior to loading any zones)
Looking at this in the face, I'm deleting the KVM vm and moving back to OpenVZ for this migration.
The only compelling reasons I've found so far for KVM/XEN are:
Running an NTP server. To my knowledge there is no way for the clock on OpenVZ to be truly independent.
Your application requires a custom kernel or kernel module.
Your application requires a specific kernel version.
You need to run something other than Linux.
I'm sure there are other valid reasons but I have not run into them. For anything else, I agree with several others here. Go with the lowest cost/best performing solution.
OpenVz cheap and easy
OpenVZ. As said you don't have special needs that need KVM.
Sure about that?
I would recommend you to go for openvz because it is highly scalable virtualization technology,strong isolation and rapid customer provisioning .
Ehm... No, not really, I mean compared to the others the isolation is not strong at all.
Other than that, I agree, OVZ does the job for less money unless you need something specific like jbxl pointed out.
The difference in ram comes from kernel and other services an OVZ which uses the kernel of HN does not need. On bigger VPSes is not noticeable.