On Wed, Dec 3, 2008 at 11:52 AM, Fabian Arrotin <fabian.arrotin at arrfab.net> wrote: > Rudi Ahlers wrote: >> Hi all, >> >> I want to start experimenting with clusters, and I would like to use >> normal desktop grade hardware for this. I have some extra PC >> components lying around, enough to build 3 - 4 moderate desktops with >> a PIV / C2D CPU & 512MB - 1GB RAM each. All the machines should have >> at least a 100MB NIC, but I can add a gigabit NIC to the machines that >> doesn't have it if need be. >> >> I have used Linux Heartbeat to failover a MySQL cluster before, and >> it's actually been running very well for about 3 years now. But, I >> want to start looking @ total clustering, with DRBD - where everything >> (not just MySQL) is being replicated across the 4 machines. I'm also >> intereated in load balancing. >> >> Has anyone done anything like this? >> >> The cluster will be running / hosting a few XEN Virtual Machines, and >> idealy if one PC / server dies (hardware failure / power failure / >> etc), then on of the other machines should still be running the >> virtual machines, i.e. no downtime. Is this possible? Can somone steer >> me into a direction where I can get more info on this? >> >> My aim: to use common, cheap PC equipment & CentOS for the project, I >> don't want to spend any more money, and want to use what I have. >> > > So if i understand you correctly, the goal is to have a Xen farm running > on multiple hosts ? > You can use the included clustering solution (conga) to do that but > normally it needs a shared storage to store the domU's .. > What i've already tested is to use drbd with GFS2 so that all the local > storage act like only one for all the nodes but that specific drbd part > is not covered by conga. But i don't get the point about load-balancing > ? you were talking about xen domU's and previously about mysql ... i > suppose mysql will be running inside of a domU ? > BTW the RHCS (conga) doesn't provide by itself a load-balancing solution > You can read the following article that was really interesting when i > wanted to test that (except that it doesn't deal with drbd, but you can > find informations on the wiki for that) : > http://www.redhatmagazine.com/2007/08/23/automated-failover-and-recovery-of-virtualized-guests-in-advanced-platform > > -- > - > Fabian Arrotin <fabian.arrotin at arrfab.net> > "Internet network currently down, TCP/IP packets delivered now by > UPS/Fedex ..." > > > > _______________________________________________ Yes, the idea is to run a XEN farm. Each VPS will have it own set of sofware running, from Windows to Linux, with SQL / Web / Email / etc. With regards to load balancing, I need it so that the total load of all the XEN VPS's can be spread out among the XEN servers, almost like a super computer. How will I do this? -- Kind Regards Rudi Ahlers