simon at netsimplify
May 11, 2007, 1:49 PM
Post #2 of 2
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Re: wackamole and perlbal - suggestions please
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Hi Ashish
> How do I loadbalance is the BIG question. Is it even possible? Can
> perlbal help me?
You could use mod_backhand to equilibrate load on your Web servers,
and relay on DNS round-robin entries for balancing.
http://www.backhand.org/mod_backhand/
Regards,
Simon
On 11-May-07, at 4:44 PM, Ashish Padave wrote:
> Greetings everyone,
>
> We are working on a LAMP project. We plan to use just 2 servers.
> These 2 servers will be running the Apache webserver and the Mysql.
> Mysql we plan to use in Master-Master mode. Why we plan to this? So
> that each loadbalanced request will get through to one of the two
> servers. The PHP script running on the servers will write to the
> local database (localhost), while the other will replicate it.
>
> This way we have a Webserver/Mysql combination always even if one
> of the boxes were to fail.
>
> Having two webservers means two IP's. How can I offer load-
> balancing without introducing a third box (which would be a SPOF)
> which redirects requests to one of the two servers. I think I can
> run wackamole on each of the boxes, so that if one was to fail, the
> other would take ownership of the IP of the failed server and
> continue to serve requests for the failed IP. But thats the high-
> availability part of it.
>
> How do I loadbalance is the BIG question. Is it even possible? Can
> perlbal help me?
>
> Nick Gerakines suggested :
>
> For a two machine setup, you'd have something like this:
>
> Machine A: dns, apache, mysql, perlbal
> Machine B: dns, apache, mysql
>
> Requests hit perlbal which sits on port 80 and watches for
> requests, the apache servers are running on a different port, lets
> say 1071, and the perlbal round-robins the requests between the
> two. Each apache talks to the local mysql. Each mysql is configured
> to slave off of the other (hence the master-master config).
>
> If one of the machines were to go down you can tell perlbal to only
> serve from the single apache without having to restart anything.
>
> This works very well if apache/mysql goes down, but if the entire
> box fails then you are in trouble. Generally speaking having
> services that reconfigure network settings and take ownership of
> ips are prone to failure.
>
> My BIG question is can perbal with wackamole or something else,
> help me to serve requests even if the machine hosting perlbal
> (Machine A) went down completely.
>
> Thank you for taking time to read the big message ;)
>
> Regards,
>
> Ashish
>
>
> _______________________________________________
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> wackamole-users[at]lists.backhand.org
> http://lists.backhand.org/mailman/listinfo/wackamole-users
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