infrastructure setup using ESI

Thu Oct 21 23:14:53 CEST 2010

Hello

Varnish is a key part of a new set of apps we are building - the ESI
feature in particular is something we want to take advantage of
extensively.

Where does Varnish typically reside in the network architecture? I would
imagine in a scenario in which we would be using ESI, we would want
Varnish in front of the application load balancers. In this way, Varnish
would be the primary page assembler. We would likely run an HA setup for
fault tolerance.

We were also considering if Varnish could be used much farther
downstream - in between the load balancer and the application. We
thought is might provide for more fault tolerance, but it seems the
disadvantage would be that there would be a separate cached copy in each
redundant varnish instance, and with ESI secondary requests would be
made back out to the same web server potentially, setting up a feed back
loop that could cause problems.

Thanks for your responses in advance.

August

August Gresens
Director of Technology, eScholastic

Scholastic Inc.
557 Broadway, NY, NY 10012

Email :: agresens at scholastic.com <mailto:agresens at scholastic.com> 
Phone :: 917 363 3662

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