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On Fri, 19 Feb 2010, Simon Waters wrote:
Gordon Henderson wrote:Wondering if anyone here's run OpenVZ?Nope but I had a virtual host that worked that way once. Seemed to work okay. Some of the memory management was "interesting". Running "varnish" showed a few of the issues with memory, I think it doesn't handle memory mapped files well in the client or some such. It ran Squid passably instead, but varnish is a better reverse proxy. I've used UML, it was fine except for lousy I/O performance in the configuration we had. And it required bespoke kernels etc, so a lot of messing around to get started and to upgrade kernels etc. I think XEN is probably best supported virtualization on Debian. kvm is up and coming. I'm concerned about reliability of virtualization technologies. And as such any that don't offer distinct benefits in this area (i.e. switching hosts when one fails automatically) is likely to drop reliability of performance. Any specific heavy lifting tasks may still show deficiencies of virtualization. Also try and use something you can run out of stock kernels unless you really enjoy compiling your own kernels and the testing that comes with that.
Well, I compile my own kernels as a matter of course, however OpenVZ applies 5MB of custom patches to it. There are "stock" kernels for Debian with it ready patched in though.
So, after some reading, it seems to be a better way to allow a program running in an OpenVZ container access to a shared timing source (used by Asterisk), rather than have each VM run it's own 1000Hz timer. (And they have specific entries in their wiki for asterisk too - always a bonus)
Migration isn't something I'm after right now, but does seem intersting - migrating an Asterisk instance is going to lose calls anyway, no matter what - Ethernet switches, ARP caches, etc. which you might get away with on a web server...
Xen was the other I've been looking at, but this "containerising" approach of OpenVZ is growing on me. Might be too busy this weekend to play though )-:
Cheers, Gordon -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html