Server failover

[Judd Pickell]

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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