Server failover

[Ryan Rix]

Post your question in its own thread... ;)

On 7/3/08, Josh Nalli <j.nalli at cox.net> wrote:
>
> 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 at gmail.com> wrote:
> > From: Judd Pickell <pickell at gmail.com>
> > Subject: Re: Server failover
> > To: "Main PLUG discussion list" <plug-discuss at lists.plug.phoenix.az.us>
> > Cc: klsmith2020 at 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 at usa.net>
> >
> > wrote:
> > > From: keith smith <klsmith2020 at 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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-- 
Thanks and best regards,
Ryan Rix
TamsPalm - The PalmOS Blog


Jasmine Bowden - Class of 2009, Marc Rasmussen - Class of 2008, Erica
Sheffey - Class of 2009, Rest in peace.
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