[ale] Debian virtualization suggestions

[Brian Pitts]

Richard Bronosky wrote:
> Another +1 for Xen. At the AJC we have gone P-to-V on about half of
> our 12 RHEL servers that face the public. I would highly recommend
> isolating your Apache instances by app layer. That is to say,
> dedicated Python/Django cluster, dedicated Ruby/Rails cluster,
> dedicated PHP cluster. I see people run 2 or three of those modules in
> a single Apache instance all the time. The result is that every
> request occupies the memory needed for all the modules, even though it
> only needs the one. That devastates your concurrent connection
> capacity.
> 
> Also look into worker MPM, and for the app layers mentioned above...
> mod_wsgi, mod_passenger, and fast CGI respectively.
> 


Out of curiosity, does you keep a cache like Squid or Varnish in front
of your app servers?

-- 
All the best,
Brian Pitts