Re: [squid-users] ICP is not working as expected

Atef Alqashqish wrote:
> Hi,
>
> I have two servers Windows 2003 with SQUID 2.7 stable 3, one of them act as origin for the two squid instances, hence one squid installation co-exist on the same box with IIS application and web site, the two squid works as expected as long as ICP and cache hierarchy is not used, only one cache_peer as parent and origin.
>
> To enhance the site performance we decide to use ICP and make one server use the second server squid as its sibling with proxy-only option, we always get ICP_MISS in the cache log even though we are sure the URL is cached in the first SQUID cache!, the below are the configuration:
>

First off 'proxy-only' is probably not a good choice in these
circumstances. It prevents any sibling fetched objects being cached, yet
you are caching objects direct from the parent. You _want_ the fastest
possible response in an accelerator, which means caching.

Secondly you are not doing a clear accelerator. For your cofiguration
below to work, something funky has to be going one with either DNS or
URL re-writers which breaks any possibility of siblingship.

See below for a description of the problem.

See
http://wiki.squid-cache.org/SquidFaq/ReverseProxy#head-7fa129a6528d9a5c914f8dd5671668173e39e341
  for a demo config of how accelerators should be configured.

> Server1 (Origin with IIS site and SQUID cache), IP 10.10.0.191:
> cache_peer 10.11.0.197 parent 80 0 no-query originserver
> acl usasite dstdomain 10.10.0.191

You sure clients are really asking for "http://10.10.0.191/" ??

> cache_peer_access 10.11.0.197 allow usasite
> cache_peer_access 10.11.0.197 deny all
> http_access allow usasite
>
> icp_port 3130
> icp_access allow all
>
> Server2(IP 10.10.10.16):
> http_port 10.10.10.16:80 accel defaultsite=10.10.10.16

So your domain name is not "10.10.0.191" but "10.10.10.16" now?

> cache_peer 10.10.0.191 sibling 80 3130 proxy-only
> cache_peer 10.11.0.197 parent 80 0 no-query originserver
> acl usasite dstdomain 10.10.10.16

Must be, but the sibling Server1 doesn't know or accept the domain name
when asked for "http://10.10.10.16/"

> cache_peer_access 10.11.0.197 allow usasite
> cache_peer_access 10.11.0.197 deny all
> cache_peer_access 10.10.0.191 allow usasite
> cache_peer_access 10.10.0.191 deny all
> http_access allow usasite
>
> icp_port 3130
> icp_access allow all
>
> Please help
>
> Atef A. M. AlQashqish
> Operation Manager / MCSE, MCT, ITIL Certified Service Manager
> iHorizons
> Tel : - +962 6 534 1640 ext 61
> Mobile:- +962 777 530053
> Fax:- +962 6 534 1927
> P.O. BOX 1610 Jubaiha 11941 Amman - Jordan
> http://www.iHorizons.com
>
>

Amos

-- 
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