Verified and Tested 02/05/15
Introduction
This tutorial will provide you some basic steps to help you lock down and secure your cloud Linux server with Atlantic.Net. By no means do these steps have to be used in order nor do you have to use all of the steps. They are recommendations on securing your server through simple means that take just a little of your time to set up or configure.
Prerequisites
For this tutorial, all that’s pre-required is that you have a Linux private cloud hosting with Atlantic.Net.
Securing your Linux Cloud server
Changing the SSH Port
Changing your SSH Port in CentOS
Changing your SSH Port in Ubuntu and Debian
Let’s Limit the root User
Limiting Your root User in CentOS
Limiting Your root User in Ubuntu and Debian
IPTables
Locking down your CentOS server with IPTables
Locking down your Ubuntu or Debian server with IPTables
Let’s get those Brute Forcers! Using fail2ban
Basic Use of fail2ban in CentOS
Basic Use of fail2ban in Ubuntu and Debian
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