Squid is configured as a kind of transparent proxy. wget resolve the name for domain.com as the ip address of squid server. When squid tries to resolve domain.com it asks to a dns server who answer the ip address of the Alteon VIP. In that way it work as a transparent proxy. Thanks in advance, Fabiano -----Original Message----- From: trainier@xxxxxxxxxx [mailto:trainier@xxxxxxxxxx] Sent: Monday, October 10, 2005 12:40 PM To: squid-users@xxxxxxxxxxxxxxx Subject: Re: Squid: no_cache directive issue. Pardon the standard "is it plugged in?" question, but.... Does wget know there's a proxy server it needs to go through? Unless you're running the proxy via port 80 (or it's transparent), wget does not appear to be going through a proxy, which would make your test useless. If your proxy is not set up transparently, you need to set the environment variable: http_proxy=ipaddress:port of the proxy server. Just a thought. :-) Tim Rainier Information Services, Kalsec, INC trainier@xxxxxxxxxx "Fabiano Silos Reis" <fsilos@xxxxxx> 10/10/2005 12:31 PM To <squid-users@xxxxxxxxxxxxxxx> cc Subject Squid: no_cache directive issue. Hello, Is there any kind of memory cache even if the object is marked to not to be cached? On my tests: I tried with acl someserver dstdomain domain.com no_cache deny someserver Using wget to debug it I have: [root@squid bin]# wget -S -O x http://domain.com/ --10:04:43-- http://domain.com/ => `x' Resolving domain.com... 10.0.19.2 Connecting to domain.com[10.0.19.2]:80... connected. HTTP request sent, awaiting response... 1 HTTP/1.0 302 Moved Temporarily 2 Date: Mon, 10 Oct 2005 13:04:42 GMT 3 Server: Apache/2.0.54 (Unix) 4 Location: http://domain.com/@/ 5 Content-Length: 286 6 Content-Type: text/html; charset=iso-8859-1 7 X-Cache: MISS from squid.domain.com 8 Connection: keep-alive Location: http://domain.com/@/ [following] --10:04:43-- http://domain.com/@/ => `x' Connecting to domain.com[10.0.19.2]:80... connected. HTTP request sent, awaiting response... 1 HTTP/1.0 200 OK 2 Date: Mon, 10 Oct 2005 13:04:42 GMT 3 Server: Apache/2.0.54 (Unix) 4 Content-Length: 1252 5 Content-Type: text/html 6 X-Cache: MISS from squid.domain.com 7 Connection: keep-alive 100%[=======================================>] 1,252 --.--K/s 10:04:43 (11.94 MB/s) - `x' saved [1,252/1,252] As you can see the answer is not being cached by the squid server. Explaining more about domain.com: Domain.com is being served by 2 webservers that are on the back of a Alteon Switch. These two are real servers for a virtual server. Alteon manipulates the connection as a transparent balancer and it is configured with round robin algorithm, it is, each connection to port 80 of the virtual server is redirected to a real server. In the body of the HTML I put a debug message to know where the answer came from. In this case if the answer came from 'webserver1' I will see in the body the phrase: "this came from webserver1". My problem: If the content is not being cached why do I receive only answers from webserver1 when I get from squid? I tried running wget lot of times and I always get in the body the same answer caming from webserver1. If I point wget to get the content direct from the virtual server (Configured in the alteon switch) I receive different body on each get. What I think it is happening: I think this is being caused by some memory cache algorithm. Even being explicit saying to squit to not to cache a content it retain the object for seconds in its memory. I did a test on my server wich is very simple. I wget just one time from http://domain.com and after exactly 15 seconds I wget it again and there it is. The body came with the debug flag from "webserver2". Is it a proof of something or not? I appreciate any help. Fabiano Here is my squid.conf: http_port 10.0.19.2:80 cache_mem 64 MB maximum_object_size 4096 KB maximum_object_size_in_memory 100 KB fqdncache_size 1024 cache_replacement_policy lru memory_replacement_policy lru cache_dir ufs /iG/http_servers/squid/bin/var/cache 40000 16 256 cache_access_log /iG/logs/squidzone/zis-01-access_log logfile_rotate 0 cache_log /iG/http_servers/squid/bin/var/logs/cache.log cache_store_log /iG/http_servers/squid/bin/var/logs/store.log #cache_store_log none emulate_httpd_log on debug_options NONE,0 log_fqdn off redirect_rewrites_host_header on acl someserver dstdomain zone.ig.com.br no_cache deny someserver #always_direct allow someserver acl alteon src 10.0.0.0/255.0.0.0 acl PURGE method PURGE http_access allow PURGE alteon http_access deny PURGE quick_abort_min 0 KB quick_abort_max 0 KB half_closed_clients off shutdown_lifetime 10 seconds acl all src 0.0.0.0/0.0.0.0 acl in_localhost src 127.0.0.0/8 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 acl Safe_ports port 80 acl CONNECT method CONNECT acl to_rz dst 10.0.0.0/255.0.0.0 acl internal_port port 80 http_access allow all to_rz http_access allow Safe_ports http_access allow internal_port http_access allow in_localhost to_localhost http_access deny CONNECT SSL_ports http_access deny all http_reply_access allow all icp_access allow all visible_hostname squid.domain.com httpd_accel_host virtual httpd_accel_port 80 httpd_accel_single_host off httpd_accel_with_proxy off httpd_accel_uses_host_header on client_db off coredump_dir /var/cache squid -v [root@zis-01 bin]# sbin/squid -v Squid Cache: Version 2.5.STABLE11-RC2 configure options: --prefix=/squid/bin-2.5.11-RC2 --enable-underscores '--enable-removal-policies=lru heap' '--enable-err-languages=English Portuguese' --enable-default-err-language=Portuguese --enable-referrer-log --enable-useragent-log '--enable-storeio=ufs diskd' --with-pthreads
