When you're debugging a tough problem you sometimes need to analyze the HTTP traffic flowing between your machine and a webserver or proxy. Sometimes you can use firebug or chrome...

analyze bash firebug http network shell squid tools tshark wireshark

If you're running Squid to cache your website, you can use an htaccess file to control what kind of files should be cached, and for how long.

apache htaccess mod_expires squid vhost

Let's say your site is becoming a big success and as a result it's becoming slower and slower. There are several things you do without buying additional hardware:

apache caching io memcached performance squid ubuntu

I recently had to install a couple of squid servers to act as reverse proxies for a webcluster. You can teach the squid server to stand in between in the end users and the webserve...

cat comments config linux squid