Hi All;

The company I work for is moving to a drupal content management system.
We expect to install a caching reverse proxy between the drupal servers
and the Internet. I'm looking into nginx and varnish for that role.

There's no question nginx provides for at least a basic high-speed
caching reverse proxy, but I'd appreciate input from people using it
with regards to these features:

1) Flexible health-checks of back-end web servers. Can I configure
nginx to accept a 503, for example, as an acceptable return code? Can I
specify a different health-check page for each back-end server?

2) Flexibility in load balancing. Can I specify anything other than
round-robin? Least connections, lowest load, that sort of thing?

3) Ability to purge or invalidate selected pages. For example, a user
logs in and updates a page that's currently cached. Can I
remove/overwrite that particular page in an nginx caching proxy?

4) Any other words of wisdom regarding nginx vs varnish?

Thanks in Advance,

--- David



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