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From Brad Van Sickle <>
Subject Re: mod_perl in larger scale environments
Date Wed, 14 Apr 2010 21:33:08 GMT
Thanks for the recommendations.  Puppet/cfmanager look like they are 
along the lines of what I'm looking for.

I didn't find much info on perlbal after a quick glance, I'll certainly 
give it a closer look, but my inital reaction is that I'm leary of 
replacing Apache on my web layer. I'm doing a few things with a few 
other modules ( mod_rewrite for example) in addition to mod_proxy, and 
from what I was able to find in my initial look, I didn't see any 
support for some of those types of things.

On 4/14/2010 5:02 PM, Fred Moyer wrote:
> On Wed, Apr 14, 2010 at 1:57 PM, Brad Van Sickle<>  wrote:
>> My first question relates to quality of service and load balancing:
>> I'm currently using mod_proxy on the web layer, and I know I can set that up
>> to load balance requests to multiple app layer nodes, but to the best of my
>> knowledge mod_proxy is not able to provide any quality of service.  So if a
>> node in the app layer had a problem (or was shut down for maintenance)
>> mod_proxy would be unaware of that and would still send requests to that
>> node.   How are situations like this normally handled?  Is there something I
>> can use other than mod_proxy that is intelligent enough to mark a host as
>> down?  I'd rather not use a hardware load balancer here if I can avoid it.
> Check out perlbal -
> The load balancing is really nice, and you can handle 10k's of clients
> with junkyard hardware.
>> My second question deals with management of multiple mod_perl nodes:
>> At some point, if you have enough app layer nodes, managing the code
>> deployments, apache configs and server restarts becomes very cumbersome if
>> you're doing it all manually.  Are there any tools that can make these tasks
>> easier or give me one management view?
> Puppet and cfmanager are general purpose systems administration tools
> that serve well here.  In addition, you can manage the rest of the
> system with these tools.

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