How to Use Port Knocking To Secure SSH Service in Linux
Port Knocking is a nifty technique of controlling access to a port by only allowing legitimate users access to the service running on a server. It works in such a way that when the
Security
How to Do Security Auditing of Linux System Using Lynis Tool
Lynis is an open-source and much powerful auditing tool for Unix/Linux-like operating systems. It scans the system for security information, general system information, installed and available software information, configuration mistakes, security issues, user accounts
LFCA: How to Improve Linux System Security – Part 20
As we all know, the root user is king and wields unlimited privileges over the Linux system. However non-root users are limited to basic tasks. In addition, sudo users are only granted a certain
LFCA: How to Improve Linux Network Security – Part 19
In an ever-connected world, network security is increasingly becoming one of the areas where organizations invest a great deal of time and resources. This is because a company’s network is the backbone of any
LFCA – Useful Tips for Securing Data and Linux – Part 18
Since its release in the early nineties, Linux has won the admiration of the technology community thanks to its stability, versatility, customizability, and a large community of open-source developers who work round-the-clock to provide
LFCA: Basic Security Tips to Protect Linux System – Part 17
Now more than ever, we are living in a world where organizations are constantly bombarded by security breaches motivated by the acquisition of highly sensitive and confidential data which is highly valuable and makes
How to Configure FirewallD in RHEL, CentOS and Fedora
Net-filter as we all know it’s a firewall in Linux. Firewalld is a dynamic daemon to manage firewalls with support for network zones. In the earlier version, RHEL & CentOS 6 we have been
How to Use Two-Factor Authentication with Ubuntu
Over time, the traditional username and password authentication has proven inadequate in providing robust security to applications and systems. Usernames and passwords can easily be cracked using a plethora of hacking tools, leaving your
Setup Passwordless SSH Login for Multiple Remote Servers Using Script
SSH Key-based authentication (also known as public-key authentication) allows for password-less authentication and it is a more secure and a much better solution than password authentication. One major advantage of SSH password-less login, let
How to Open Port for a Specific IP Address in Firewalld
How can I allow traffic from a specific IP address in my private network or allow traffic from a specific private network through firewalld, to a specific port or service on a Red Hat