[Xen-devel] Pointers needed

[Jan van Rensburg <jan.van.rensburg@xxxxxxxxxx>]

Hi,

We're going to start a project soon for a fairly big client. Part of 
the project involves setting up a highly available web cluster with 
load balancing, based on RedHat enterprise linux 3, that will run about 
80 virtual web servers. One of the requirements of the web server setup 
is QOS guarantees for the virtual web sites, so that one virtual host 
with runaway perl/php etc web pages won't let the whole machine grind 
to a halt. At first we thought this could be done with Apache, but 
after careful investigation it does not look like you can have resource 
guarantees and isolation between virtual web servers. In fact it looks 
like the only web server really capable of this at the moment is the 
Zeus range of products. However, we don't want to go that route. 
Instead we want to run each virtual web server on a separate virtual 
machine, based on Xen. I would like some pointers about how this might 
be implemented. First of all, how would you do high availability and 
load balancing with Xen virtual servers? Secondly, since the different 
virtual host images are all mostly the same, except for a few minor 
details, is there a way to have a master image that all the server 
could boot from, even though each virtual server has it's own IP 
address and apache config? I don't want to have 80 separate images 
lying around if they're 99% the same. Neither do I want to patch 80 
servers separately if a security patch become available.
I must admit I haven't tried Xen yet, however I have read the 
documentation available on the web site. Any other pointers on such a 
setup would be appreciated.
Regards,
Jan van Rensburg



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