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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...

 How to Check CentOS Version

The easiest way to check your CentOS version is via the command line. Login to your CentOS...

 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,...