topic Re: which is the best way to delete squid cache ? in Operating System - Linux

which is the best way to delete squid cache ?

'chris' — Thu, 26 May 2005 17:22:41 GMT

hi

which is the best way to delete squid cache ?
how often should I do that ?
I have Squid 2.5.STABLE4 installed on linux SUSE 8.2
and I'm using it for about 250 clients.
for Squid Cache I have configured 20GB in squid.conf :

cache_dir ufs /var/cache/squid 20000 16 256

kind regards
chris

Re: which is the best way to delete squid cache ?

Stuart Browne — Thu, 26 May 2005 18:13:15 GMT

To remove the Squid cache (which I don't advise), you stop squid, 'rm -fr /var/cache/squid/*', then start squid again (which will re-make the structure).

I *DO NOT* advise doing this. The whole point of Squid is to have those cached files. The ageing settings is what you care about, as this tells squid whether it should keep something in the cache or not (see the 'refresh_pattern' settings in squid.conf).

Re: which is the best way to delete squid cache ?

Steven E. Protter — Thu, 26 May 2005 23:45:24 GMT

I'm wondering why you are wanting to delete the squid cache in the first place. If the target website has updated its content, the cache should be updated.

If you could provide reasoning for wanting to delete it, there might be possible suggestions on improving the situation.

Stuart's already provided you the info on how to do it.

I would shut down the squid server prior to going against his advice. At least the server will start clean.

Once a day should do it, if you go ahead. You will notice users slowing down after the cache is dumped.

SEP

Re: which is the best way to delete squid cache ?

'chris' — Sat, 28 May 2005 09:12:10 GMT

hi

I would like to delete, because our proxy users have a problem
with one website (booking engine).
Some users can work with these webseite without problems
and some of them get page errors.
Shift-Refresh doesn't help.
Or how can I delete not the whole cache,
but only the cache of these webseite ?

greetings
chris

Re: which is the best way to delete squid cache ?

Stuart Browne — Sat, 28 May 2005 11:33:58 GMT

What do the Squid logs say about that website for the affected workstations?

Re: which is the best way to delete squid cache ?

'chris' — Sat, 28 May 2005 11:42:23 GMT

I don't know because I deleted the whole cache and now it seems to work without problems.

Re: which is the best way to delete squid cache ?

'chris' — Thu, 02 Jun 2005 13:23:27 GMT

is it any way to delete the cache from only one webseite instead of the whole cache from the all webseites ?

Re: which is the best way to delete squid cache ?

xyko_1 — Thu, 02 Jun 2005 15:01:54 GMT

Hi Chris,

If your problem occurs only for known sites you may tell squid not to cache those sites.

See the documentation on http://www.squid-cache.org/Doc/FAQ/FAQ-7.html#ss7.8

regards,
xyko

Re: which is the best way to delete squid cache ?

'chris' — Thu, 02 Jun 2005 15:37:25 GMT

thanks,

but should I really put this:
^
before the URL ?

acl XYZZY url_regex ^http://www.i.suck.com/foo.html$
no_cache deny XYZZY

Re: which is the best way to delete squid cache ?

Stuart Browne — Thu, 02 Jun 2005 18:12:39 GMT

In a regular expression, the symbol ^ means that the atom is at the very start of a string. The $ symbol means that the atom is at the very end of the string.

i.e. ^http:// means the URL has to start with 'http://'.

The example you've got in your previous post would seem that the enture URL would have to be an exact match.

Re: which is the best way to delete squid cache ?

Axel Müller_2 — Thu, 09 Jun 2005 07:25:58 GMT

Is there an way to delete only one specific object from the squid cache?

Re: which is the best way to delete squid cache ?

Stuart Browne — Thu, 09 Jun 2005 07:31:17 GMT

Hrm.. Try http://www.squid-cache.org/mail-archive/squid-users/199707/0342.html , but I've never tried it.