Hi,
as a varnish newbie I tried a very simple accelerator configuration:
varnish v2.1 in front of a CMS backend that issues a "unnecessary"
restrictive non-caching policy via the HTTP header like
Cache-Control: private, must-revalidate, max-age=0
Vary: User-Agent
To hold data nevertheless one minute in the varnish cache I tried to use
the following kind of code (found similar in some examples and tutorials)
sub vcl_fetch {
if (obj.ttl < 60s) {
set obj.ttl = 60s;
}
}
But starting varnishd I always get the error
Message from VCC-compiler:
Variable 'obj.ttl' not accessible in method 'vcl_fetch'.
At: (input Line 7 Pos 10)
if (obj.ttl < 60s) {
---------#######---------
Running VCC-compiler failed, exit 1
VCL compilation failed
http://varnish-cache.org/wiki/WikiStart#a2010-03-24Varnish2.1.0released
shows a short summary of changes and the hint "see the changelog for a
fuller list". But I couldn't find an according changelog (the file
in the sources is "empty").
But I detected the fact that within the corresponding (?) testfile
"bin/varnishtest/tests/v00016.vtc" the "obj.ttl" was changed to
"beresp.ttl" (from v2.0.6 to v2.1). Is that possibly relevant to my
problem?
So my question: In which method the mentioned functionality (forcing
caching of an not-cachable object for a short meaningful time) must be
configured in varnish v2.1?
And another currently not important question: Principally much of the
backend pages are delivered in two versions (for user-agent IE and for
user-agent Firefox incl. others). So an idea may be to have two specific
varnish caches like
/- varnish IE -\
Apache Backend CMS
\- varnish FF -/
The Apache as "user-agent"-scheduler is just choosen since it could/should
also do other tasks. Would that be meaningful or can varnish control that
already itself?
And a small request: Some basic complete VCL examples would make the
start in the varnish world much easier ;-)
Sorry, if my question are FAQs.
Regards
Jens
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