Re: [squid-users] QUID stops responding intermittently.

On Tue, 20 Oct 2009 19:53:02 +0500, "Asim Ahmed @ Folio3"
<aahmed_at_folio3.com> wrote:
> -
>
> Hi all,
>
> I have installed Squid 3.0 STABLE on RHEL5. I am using it on conjunction

3.0STABLE what? there are now around 21 releases in circulation.

> with Shorewall 4.4.2.2. I've tested that Shorewall is working fine on
> machine. The problem is that SQUID stops responding intermittently. This

> period ranges from minuts / hours / days. Some time it works absolutely
> fine and at other times it just dies. Even "tail -f access.log" does not

> show any activity at all. Internet stops working.
>
> Machine is Pentium D 2.0 GHz with 2 GB of RAM. Out of my squid.conf
> through *grep -v "^#" /etc/squid/squid.conf | sed -e '/^$/d'* is
>
> acl manager proto cache_object
> acl localhost src 127.0.0.1/32
> acl to_localhost dst 127.0.0.0/8
> acl localnet src 192.168.4.0/24 # RFC1918 possible internal network
> acl Safe_ports port 80 # http
> acl Safe_ports port 21 # ftp
> acl Safe_ports port 443 # https
> 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
> acl BusinessHours time M T W H F 9:00-13:00
> acl BusinessHours time M T W H F 14:30-19:00

The above should have no spaces in the day specifier: MTWHF

> acl BadSites dstdomain "/etc/squid/restricted_sites.list"
> http_access allow manager localhost
> http_access deny manager
> http_access deny !Safe_ports
> http_access deny BadSites BusinessHours
> http_access allow localnet
> http_access deny all
> icp_access allow localnet
> icp_access deny all
> htcp_access allow localnet
> htcp_access deny all
> reply_body_max_size 5 MB
> http_port 46095 transparent
> include /etc/squid/mediatypes.list
> hierarchy_stoplist cgi-bin ?
> cache_mem 256 MB
> cache_dir ufs /var/spool/squid 16384 16 256

This is probably the cause. UFS file system is extremely slow. Also with
>10GB the default garbage collection settings for 3.0 are too wide. Squid
can block up while removing 5% of the cached files once an hour.

I recommend setting:
  cache_dir aufs /var/spool/squid 16384 16 256
  cache_swap_low 90
  cache_swap_high 92

Also,,,,

 check cache.log for signs of squid dying. Restarting and reloading a
large cache through slow disk IO systems can cause a few dozen seconds
delay in request handling.

 please use the latest release available (there are current 'unofficial'
packages for RHEL in the www.squid-cache.org binary downloads pages).

> access_log /var/log/squid/access.log squid
> refresh_pattern ^ftp: 1440 20% 10080
> refresh_pattern ^gopher: 1440 0% 1440
> refresh_pattern (cgi-bin|\?) 0 0% 0
> refresh_pattern . 0 20% 4320
> shutdown_lifetime 5 seconds
> visible_hostname gateway.folio3.com
> icp_port 3130
> coredump_dir /var/spool/squid
>
> Any help on where to look for the error and any remedy would be
> appriciated.

Amos
Received on Tue Oct 20 2009 - 21:27:03 MDT