John Nielsen wrote:
On Wednesday 21 February 2007 20:50, Martin McCormick wrote:
If one has a FreeBSD system that has 1 gigabyte of RAM
and a 1-GHZ processor, would it be possible to run a couple of
vmware instances of FreeBSD? I want to set up a DHCP server on
each virtual machine and configure one to be optimized for DHCP
failover and dynamic leases while the other is dedicated to
static bootp service. It would be much easier for the 2
instances of dhcpd to run in separate machines, so to speak,
since they normally use the same named files for logging and
configuration.
What sort of a performance hit does one usually see on a
virtual machine?
Depends a lot on the virtual machine. VMware Server runs VM's pretty
efficiently, but there is a moderate hit. ESX server has almost n
performance penalty.
When we run dhcpd on a normal FreeBSD system of the type
described above, the system is normally loaded around 0.05 or so
so it isn't having to work too hard.
Thanks for any help as to what vmware port is best. The
platform is FreeBSD and the 2 virtual machines will also be
FreeBSD if that makes any difference.
Modern versions of VMware don't run under FreeBSD. If you really want VMware
then install a supported Linux distro and run VMware server. (Or go out and
buy ESX or GSX server or one of the Workstation products). FreeBSD 6.2
works great as a guest under most VMware products.
There will be no X windows involved, just hopefully 2
DHCP servers running as if they were on two separate boxes.
Any information to point me in the right direction or
reasons why this is not a good idea are appreciated.
For what you're talking about, jails make a lot more sense than
virtualization or emulation. If you really want to run virtual machines
under FreeBSD, take a look at qemu. qemu (even with the kqemu_kmod port
(highly recommended) definitely has a noticeable performance impact, but
DHCP is so lightweight that it probably won't matter.
JN
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If the goal is just to run FreeBSD instances inside your virutal
machines vmware, qemu, xen etc are all not needed. Use jails instead
which would be much faster.
--
-Frank Staals
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