Re: Server failover

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 <pickell@gmail.com> wrote:
> From: Judd Pickell <pickell@gmail.com>
> Subject: Re: Server failover
> To: "Main PLUG discussion list" <plug-discuss@lists.plug.phoenix.az.us>
> Cc: klsmith2020@yahoo.com
> 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 <danceswithcrows@usa.net>
>
> wrote:
> > From: keith smith <klsmith2020@yahoo.com>
> >
> >> 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
> >
> >
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Does anyone have a cheap Nvidia video card I can buy?
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