On Thursday 03 July 2008 05:30:31 pm Lisa Kachold wrote: > WEB Server FARMS, clustering and failover: > > Let's use the "OSI Layer" here: > > Layer 5-7: If you are running Java in a single tiered model, there are > cluster based options in the Application server side. > > Layer 3.5-4: Network hardware load balancer is an excellent tool. These > also allow you do some URL rewriting (the best is a CSS switch; cheap > Alteons are available for cheap used). They balance multiple servers for > incoming packets and provide failover. > > Layer 3: drbd or heartbeat works but not really well. The server, not > the Apache process will failover, and it not really scalable. > > Layer 3: Ultra Monkey no arp clustering. This is an Alan Cox kernel hack > that will allow you to cluster a great number of servers to take a HUGE > amounts of hits. If one quits it is removed from the Director. It works > well, and is easy to setup. Ultra Monkey is the name of a product, but the > application developed by Alan Cox is a kernel rebuild to route packets > based on Mac address rather than IP from and to a Director > script/application. Research it and see if you can engineer your own for > you distro, or just buy Ultra Monkey. > > (503)754-4452 Blackberry || www.obnosis.com > > via USB PPP EDVO/CDMA on Dell Latitude PII - Kubuntu 7.10 > > --- On Thu, 7/3/08, Judd Pickell <[EMAIL PROTECTED]> wrote: > From: Judd Pickell <[EMAIL PROTECTED]> > Subject: Re: Server failover > To: "Main PLUG discussion list" <plug-discuss@lists.plug.phoenix.az.us> > Cc: [EMAIL PROTECTED] > Date: Thursday, July 3, 2008, 3:40 PM > > One of the places I worked for used this: http://bb4.com/ however it > maybe too big for your needs, I am not sure. > > On Thu, Jul 3, 2008 at 10:04 AM, Matt Graham <[EMAIL PROTECTED]> > > wrote: > > From: keith smith <[EMAIL PROTECTED]> > > > >> I am looking for information on how I might be able to mirror one > >> server onto another and set them up so if the main server dies > >> the second server will take over automatically. > > > > heartbeat and drbd. http://linux-ha.org/ and http://drbd.org/ to > > start. > > > >> The mirroring would require the website content itself and the > >> MySql data. > > > > drbd works below the filesystem level, if you want to use that. You > > really need a dedicated high-speed link between the 2 systems if you > > want to use drbd. Unless you use one of the newer and less well > > tested filesystems such as GFS, if you use drbd, you have to have the > > primary machine mount the filesystem, and the secondary machine can't > > mount the filesystem at all. Scripts allow the secondary machine to > > become primary if/when the primary flails over. > > > >> Now if I had 3 servers would I be able to do this by having them > >> all three working as a "farm" to serve up multiple websites? > > > > Not in the way described above. drbd is very much a 2-machine system. > > You could have a drbd cluster with large disks acting as the main > > fileserver, and 1..N machines that mount the filesystems on that > > server via NFS. Then machines 1..N could serve content via apache > > or apache combined with ldirectord. > > > >> Is it possible to do this on a small budget? > > > > Define "small". You need boxes, time to set it all up, and > > disks. > > > -- > > Matt G / Dances With Crows > > The Crow202 Blog: http://crow202.org/wordpress/ > > There is no Darkness in Eternity/But only Light too dim for us to see > > > > > > --------------------------------------------------- > > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > > To subscribe, unsubscribe, or to change your mail settings: > > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > To subscribe, unsubscribe, or to change your mail settings: > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss
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