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 Formats for /etc/mailhelo and /etc/mailips

You may use any command-line text editor such as vi (or vim), nano (or pico), to edit the files....

 IP canonicalization via htaccess

You generally don't want to mix Redirect (mod_alias) with RewriteRule (mod_rewrite) because they...

 Setting up a permanent 301 redirect via .htaccess

A permanent 301 redirect in your .htaccess file lets search engines and others know that a old...

 How to find the public IP address from command line

Here is how to find the public IP address from command line. You first need to install curl as...

 How To Install Varnish 4 on CentOS 7

Varnish is a proxy and cache, or HTTP accelerator, designed to improve performance for busy,...