How to Configure TCP keepalive Settings on Ubuntu (and other Debian-based systems)
TCP keepalive is a feature used to detect and close inactive or unresponsive connections. It works by periodically sending a small packet called a “keepalive probe” to maintain the connection….
How to Install Traceroute on Linux (Ubuntu, CentOS, RHEL, Fedora)
Traceroute is a network diagnostic tool used to trace the route that packets take from your computer to a target destination (e.g., a website or another server). It can help…
How to Check if Telnet is Installed on a Linux System
Before attempting to install Telnet on a Linux system, it is a good idea to verify whether it is already installed or not. In this short guide, we will demonstrate…
How to Install Telnet on Linux (CentOS, RHEL) using the YUM package manager
Although Telnet is not considered the most secure protocol for remote access, it can still be helpful for certain network administration tasks, such as testing and troubleshooting network services. In…
How to Install Telnet on Windows, MacOS, Linux
Telnet is a network protocol that allows users to access and interact with remote computers over the internet. It was widely used before the advent of more secure protocols such…
How to add SPF Record in Bind DNS Zone on Linux
In the world of email authentication, Sender Policy Framework (SPF) is a widely used protocol that helps prevent email spoofing and protects against forged sender addresses. By adding an SPF…
How to Find Big Files Size on Linux RHEL/CentOS
For Linux administrators, there are times when we need to identify the files that are consuming the most space on our Linux server, leading to low free space. This is…
How to Update CentOS or Upgrade CentOS to the Latest Version
Recently, the latest version of CentOS 7.3 was released. All users of CentOS 7.0, 7.1 and 7.2 can upgrade their system to the most recent. This quick guide will explain…
How to Install and Setup 389 Directory Server on CentOS 7
389 Directory Server (previously Fedora Directory Server) is an open source enterprise class LDAP server for Linux. It is developed by Red Hat community-supported Fedora Project. The name 389 is…
How to Migrate LVM or Volume Group to New Linux Server
This article will describe on how to move or migrate LVM and volume group from one server to another. If you are working in a production environment then you have…
How to Disable IPv6 on Redhat / CentOS 6 / CentOS 7
This howto will show you how to disable IPv6 on RHEL 6/7, CentOS 6, and CentOS7. IPv6 is enabled by default. In this article, I summarize 3 configuration which needs…
How to Install and Setup Munin on CentOS 7
Munin is open source and free software for monitoring computer system, network monitoring and application infrastructure monitoring software. Munin offers monitoring and alerting for servers, switches, applications, and services. Munin…