[Zope] Caching/http-acceleration and proxying Zope-served content

[Peter Sabaini]

i used to use squid and was very happy with it. you can do a lot of
fine tuning as to which and how you want to have yor objects cached
and its _very_ fast. i didnt get that with apache/mod_proxy; to tell
the truth i never was sure how much (and why) got cached by mod_proxy
since it doesnt write a log.

actually i use a combination of squid / apache because i need some
re-writing, you could as well use squid for caching and apache for
(name-based) virtual hosting. this of course introduces additional
latency, but this shouldnt be a problem if your objects are fairly
cacheable, ie. most content would be served out of squid anyway.

cheers,
peter.

On Mon, 8 Jan 2001 sean.upton@uniontrib.com wrote:

:I have a question, for anyone experienced in working with Zope and caching
:proxies:
:
:I'm setting up a load-balanced server farm that has nodes that will run
:Apache and proxy (via mod_proxy) to ZEO clients running ZServer.  This farm
:is routed (both ways) through a layer 4 load-balancing appliance, and all
:these boxes (both nodes and the balancer) are sitting inside a DMZ with
:private IP addresses.  The public world will access these servers via a
:firewall box running transparent proxy (actually, I guess, similar to
:squid's http_accel mode; the semantics here are a bit tricky, as it's more
:of a inverse trans-proxy).  Between Apache and Zope, there would be several
:virtual hosts, and I'd be using the SiteAccess product.  It gets a bit
:tricky in that I need to access several different virtual hosts inside the
:DMZ (one for the ZEO farm, and another for a dedicated CGI-based ad server
:on another box) via the proxy.  A more detailed (ascii art) diagram of what
:I am trying to do, is at http://209.132.8.98/server_ascii_art.txt
:
:My question is this: does anybody have any thoughts on the merits of Squid
:(http accelerator mode) versus Apache/mod_proxy in terms of caching, virtual
:hosts, and the like when working with Zope sites?  Any big pitfalls to this
:kind of setup with Zope sites?
:
:Also, somewhat related, is: if anybody knows if Squid can even handle
:multiple virtual hosts running on different boxes?  Or is squid not suitable
:for an inverse-proxy running on the border of a DMZ containing more that a
:single host?
:
:I'd really appreciate anyone's thoughts.  Once I get this thing working,
:I'll likely end up writing a howto regarding how I did it, as this seems
:like a useful setup for a high-volume, heterogeneous (not ideal, but
:reality), production media site running Zope (and other legacy CGI apps /
:static content as well)...
:
:Much thanks in advance,
:Sean
:
:=========================
:Sean Upton
:Senior Programmer/Analyst
:SignOnSanDiego.com
:The San Diego Union-Tribune
:619.718.5241
:sean.upton@uniontrib.com
:=========================
:
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-- 

_________________________________________________
peter sabaini, mailto: sabaini@niil.at
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