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Re: Clearing the cache

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On Feb 24, 2008, at 4:40 AM, Amos Jeffries wrote:

Ric wrote:
In http://wiki.squid-cache.org/SquidFaq/ClearingTheCache, it says to purge the cache via:
squid -k shutdown
rm -r /squid/cache/*
squid -z
squid
I've seen elsewhere say to use:
squid -k shutdown
echo '' > /squid/cache/swap.state
squid
I like this second one -- it's fast and simple (and less scary than a recursive rm with fumbling fingers). Any problems with it?

Removal of only swap.state causes formally 'undefined' behaviour. For now it continues to drop the cache. But there is no guarantee that will remain.

As for the scary fumbling: what are you doing erasing the proxy cache in the first place? It's a last-resort on severe drive write failures!
Just removing swap.state does not solve that problem.

Amos


In the reverse-proxy case, it's useful to clear the cache once in a while as you fiddle with cache-control headers or change the site drastically enough that individual purges are impractical.

Now, if squid should ever support a wildcard/regex purge request -- even if only via command line -- that would be even better. Wildcard purges and built-in basic url rewriting are two features that make Varnish very attractive for simple reverse proxy setups.

Ric




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