On Apr 18, 2007, at 12:36 PM, Perrin Harkins wrote:
On 4/18/07, Denis Banovic <[EMAIL PROTECTED]> wrote:
Is it possible to configure Perlbal so there is no single point of
failure?
That sort of high-availability setup is beyond the scope of an
application-level load balancer like Perlbal. You need to use
something that allows for IP takeover. The hardware solutions work,
and there are many HA software solutions for Linux as well. Some of
them are noted in the mod_perl docs:
http://perl.apache.org/download/
third_party.html#High_Availability_and_Load_Balancing_Projects
To add to that software list: on BSD there's CARP
http://en.wikipedia.org/wiki/Common_Address_Redundancy_Protocol
FWIW, A common setup i see is something along the lines of
1. internet
2. lan gateway : 2+ nodes running carp or virtual server
3. load balancer : 2+ nodes ( sometimes running on the gateways )
4. lan : db + application servers
often i see people using soekris boxes on the gateways ( ever
notice if you subscribe to bsd user-groups thats all people ever talk
about )
http://www.soekris.com - they're little embedded boxes that run off
compactflash cards. it ends up costing ~$700 for 2 independent boxes.
they're not terribly fast , and don't support gigabit, but they hold
up well if you're only doing the basic firewall/routing. and unless
your traffic is requiring gigabit connectivity, they're a decent
option to delay running out and buying a couple of dedicated firewall
boxes with gigabit to run as your gateway.
// Jonathan Vanasco
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
| SyndiClick.com
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
| FindMeOn.com - The cure for Multiple Web Personality Disorder
| Web Identity Management and 3D Social Networking
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
| RoadSound.com - Tools For Bands, Stuff For Fans
| Collaborative Online Management And Syndication Tools
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - -
