Re: [squid-users] Howto Clear Cache Periodicaly

Guillaume Vachon wrote:
> On Tue, 2006-04-11 at 14:51 +0100, Neil A. Hillard wrote:
>> Hi,
>>
>> mail reformatted to make sense (i.e. please don't top post!)
>>
>>>>> I have a squid that has been caching for like 10 month. It now have an
>>>>> amazing size of 4.5 gig.
>>>> What you have is determined by the cache_dir specifications
>>>> in squid.conf. The size there is taken into account , and SQUID will
>>>> trimm cache dirs automatically if that would be needed.
>>>>
>>>>
>>>>> When browsing on the web, it is now very very
>>>>> slow. I restarted squid with a clean cache. Everything was fine again. I
>>>>> was wondering if there were a way to tell squid to clean cache
>>>>> periodicaly?! So I would not have to do it myself.
>>>>>
>>>> - The idea of a caching proxy is to have a cache, and to benefit
>>>> from that, not clean it.
>>>> I run SQUID with the same cache dir and or squid maintained content
>>>> for more then year without touching it.
>>>> And or touching it alone, if serious SYSTEM or disk problems would occur.
>>>>
>>>> Make sure that your disk access performance, for instance, is adequate
>>>> for the SQUID induced disk I/O load.
>> >
>>> For the computer that is running Squid it is a Dual core 3 ghz, there
>>> is 2 gig of ram. The disk are scsi. I don't think that it is the
>>> machine that is having the probleme. There is no probleme with the
>>> access to disk.
>> If you want better advice you'll need to show here how you've checked
>> that. Have you used iostat, vmstat, etc. You may also want to post you
>> squid.conf (stripped of comments and blank lines).
>>
>> Do you have multiple cache_dirs specified?
>>
>>> There might be solution somewhere. I mean I should not have to reset
>>> my cache. The computer is strong enough. But still it went really
>>> slow (so slow that browsing the web was imposible)and restarting
>>> squid with a new cache solved the problem. What can I do to be sure
>>> that this does not happen again
>> Correct - you should not have to. After all, I have a dual P3-667MHz
>> with 512Mb RAM serving over 3500 clients. Your machine is considerably
>> more powerful.
>>
>> What is the machine doing when it is in this state. Is anything logged
>> in cache.log, anything relevant in syslog?
>>
>>
>> Without more information we can't really offer any advice.
>>
>>
>> Neil.
>>
>
> ---
>
> Here is my squid.conf
>
> pid_filename /opt2/squid-logs/squid.pid
> redirect_program /usr/local/squid/bin/zapchain /usr/local/squid/bin/squidGuard
> "/usr/local/squid/bin/SquidClamAV_Redirector.py
> -c /usr/local/squid/etc/SquidClamAV_Redirector.conf"
> redirect_children 30
> acl localhost src 127.0.0.1/255.255.255.255
> acl proxycsbf src 10.0.10.15/255.255.255.255
> redirector_access deny proxycsbf
> redirector_access deny localhost
> auth_param basic children 5
> auth_param basic realm Squid proxy-caching web server
> auth_param basic credentialsttl 2 hours
> auth_param basic casesensitive off
> refresh_pattern ^ftp: 1440 20% 10080
> refresh_pattern ^gopher: 1440 0% 1440
> refresh_pattern . 0 20% 4320
> acl all src 0.0.0.0/0.0.0.0
> acl manager proto cache_object
> acl to_localhost dst 127.0.0.0/8
> acl SSL_ports port 443 563
> acl Safe_ports port 80 # http
> acl Safe_ports port 21 # ftp
> acl Safe_ports port 443 563 # https, snews
> acl Safe_ports port 70 # gopher
> acl Safe_ports port 210 # wais
> acl Safe_ports port 1025-65535 # unregistered ports
> acl Safe_ports port 280 # http-mgmt
> acl Safe_ports port 488 # gss-http
> acl Safe_ports port 591 # filemaker
> acl Safe_ports port 777 # multiling http
> acl CONNECT method CONNECT
> http_access allow manager localhost
> http_access deny manager
> http_access deny !Safe_ports
> http_access deny CONNECT !SSL_ports
> acl our_networks src 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
> http_access allow our_networks
> http_access deny all
> http_reply_access allow all
> icp_access allow all
> cache_mgr ""
> cache_effective_user squid
> cache_effective_group squid
> visible_hostname ""
> err_html_text toot@ootot.net
> forwarded_for off
> cachemgr_passwd *******
> error_directory /usr/local/squid/share/errors/French
> coredump_dir /usr/local/squid/var/cache

You don't have a cache_dir declared so squid wouldn't start with that
config!

>> What is the machine doing when it is in this state. Is anything logged
>> in cache.log, anything relevant in syslog?
>
> Says too much file open in the cache or something like that.

Please give the exact message as it will help tracing the problem. It
sounds like you may be running out of file descriptors.

                                Neil.

-- 
Neil Hillard                    hillardn@whl.co.uk
Westland Helicopters Ltd.       http://www.whl.co.uk/
Disclaimer: This message does not necessarily reflect the
             views of Westland Helicopters Ltd.