I keep one barebones (CentOS) domU around as a template in each of my Xen deployments; since the virtual disks are LVM2 logical volumes, a new host is simply a matter of 'lvcreate', 'virt-clone', and 'yum update'. Yes, I realize the use of virt-clone crosses the line into "libvirt Land" but, as they say: "If it's stupid but it works, it ain't stupid."
Cheers, -sth sam hooker|[email protected]|http://www.noiseplant.com "I have not failed, I've just found 10,000 ways that won't work." Thomas Edison ----- Original Message ----- > From: "Dave Tisdell" <[email protected]> > To: [email protected] > Sent: Thursday, July 5, 2012 4:01:39 PM > Subject: Re: xen virtualization > > Great. Nice to hear about stuff in production before I "make the > leap". > > Any trick about installing xen virtual machines I should be aware of? > > On 7/5/12, Mobile Penguin <[email protected]> wrote: > > We use a combination of XEN and KVM for our webhosting/VPS. The > > great thing > > about Virtualization and Linux is the ability backup your virtual > > machines. > > If your running a somewhat homogenous setup failover and recovery > > is rather > > trivial. XEN running on the proper hardware suffers almost no > > performance > > penalty's at almost native speeds though this really depends on how > > many > > virtual machines you have running. We use "16 core" i7's which are > > really 8 > > when you break it down. I admin an apache SOLR server which relies > > heavily > > on java, i have this "pinned" to only utilize a set number of cores > > and it > > is serving tens of thousands of queries hourly without any > > performance > > impact on other virtual hosts. If there are no budget constraints i > > highly > > recommend the Xeon E-series and a dedicated hardware raid > > controller. We > > use a combination of platter based disks and SSD drives to get the > > best > > performance/reliability. > > > > On Thu, Jul 5, 2012 at 10:19 AM, Sam Hooker <[email protected]> > > wrote: > > > >> Dave, > >> > >> I use Xen 3 to run, among other things, an instance of Zimbra > >> within a > >> paravirtualized CentOS 5 guest. Zimbra relies heavily on Java and > >> moderately on MySQL, and performs acceptably (although it serves a > >> very > >> small population). Sizing concerns aside, I didn't have to > >> implement any > >> workarounds or special tunings to get it to work. > >> > >> > >> Cheers, > >> > >> -sth > >> > >> sam hooker|[email protected]|http://www.noiseplant.com > >> > >> "To invent, you need a good imagination and a pile of junk." > >> Thomas Edison > >> > >> ----- Original Message ----- > >> > From: "Dave Tisdell" <[email protected]> > >> > To: [email protected] > >> > Sent: Thursday, July 5, 2012 9:19:51 AM > >> > Subject: xen virtualization > >> > > >> > Hi, > >> > > >> > Are any of you using xen virtualization? I have a client that is > >> > starting to move some of his servers from OS X to Linux and we > >> > are > >> > considering virtualizing some of the services. He runs a web > >> > based > >> > data collections service for schools. The main thing running > >> > inside > >> > the virtual servers would be JAVA based web apps connecting to a > >> > MySQL > >> > database. Any performance issues with JAVA apps inside a xen > >> > based > >> > virtual server I should be aware of? > >> > Thanks. > >> > > >> > Dave > >> > > >> > -- > >> > > >> > > >> > This e-mail may contain information protected under the Family > >> > Educational > >> > Rights and Privacy Act (FERPA). If this e-mail contains student > >> > information > >> > and you are not entitled to access such information under FERPA, > >> > please > >> > notify the sender. Federal regulations require that you destroy > >> > this > >> > e-mail > >> > without reviewing it and you may not forward it to anyone. > >> > > >> > > > > > -- > David Tisdell. Music Teacher > Browns River Middle School > 20 River Road > Jericho, VT 05465 > [email protected] (e-mail) > > -- > > > This e-mail may contain information protected under the Family > Educational > Rights and Privacy Act (FERPA). If this e-mail contains student > information > and you are not entitled to access such information under FERPA, > please > notify the sender. Federal regulations require that you destroy this > e-mail > without reviewing it and you may not forward it to anyone. >
