Linux Tutorials on the topic “security”
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How to Find Active SSH Connections on Linux
Author: Hitesh Jethva • Tags: linux, security • Comments: 0 • Published: May 13, 2020If you are Linux system administrator and responsible for managing servers then you may often need to know how many ssh connections are active on your server and where the connections come from. This tutorial shows you different ways to identify the connections.
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How to Securely Destroy/Wipe Data on Hard Drives with shred on Linux
Author: Falko Timme • Tags: linux, security • Comments: 19 • Updated: May 08, 2020Sometimes you need to destroy or wipe data from hard drives (for example, before you sell your old hard drives on eBay) so that nobody else can access them. Simply deleting data (e.g. with rm) is not enough because that just removes the file system pointer, but not the data, so it can easily be undeleted with recovery software. Even zero'ing out your hard drive might not be enough. Here's where shred comes into play - shred can overwrite the files and partitions repeatedly, in order to make it harder for even very expensive hardware probing to recover the data.
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Server monitoring with Munin and Monit on CentOS 7.2
Author: Till Brehm • Tags: centos, monitoring, security • Comments: 6 • Updated: Apr 30, 2020In this article, I will describe how you can monitor your CentOS 7.2 server with Munin and Monit. Munin produces nifty little graphics about nearly every aspect of your server (load average, memory usage, CPU usage, MySQL throughput, eth0 traffic, etc.) without much configuration, whereas Monit checks the availability of services like Apache, MySQL, Postfix and takes the appropriate action such as a restart if it finds a service is not behaving as expected. The combination of the two gives you full monitoring: graphics that lets you recognize current or upcoming problems (like "We need a bigger server soon, our load average is increasing rapidly."), and a watchdog that ensures the availability of the monitored services.
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How to Install osquery on Debian 10
Author: Hitesh Jethva • Tags: debian, linux, monitoring, security • Comments: 0 • Published: Apr 28, 2020osquery is a free and open-source tool developed by Facebook that can be used for querying operating system-related information including, memory usage, installed packages, process information, login users, listening ports and many more.
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How to Install TeamPass Password Manager on Debian 10
Author: Hitesh Jethva • Tags: debian, linux, security • Comments: 0 • Published: Feb 18, 2020TeamPass is a collaborative password manager used for managing passwords and sharing them among team members with a specific role. In this tutorial, we will show you how to install TeamPass on Debian 10 and secure it with Let's Encrypt SSL.
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How to Install and Use AIDE Advanced Intrusion Detection Environment on CentOS 8
Author: Hitesh Jethva • Tags: centos, linux, security • Comments: 0 • Published: Feb 05, 2020AIDE stands for "Advanced Intrusion Detection Environment" is one of the most popular tools for monitoring changes to Linux-based operating systems. In this tutorial, we will show you how to install and use AIDE to detect intrusions on CentOS 8.
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How to Install OpenVPN Server and Client with Easy-RSA 3 on CentOS 8
Author: Muhammad Arul • Tags: centos, linux, networking, security • Comments: 10 • Published: Dec 13, 2019OpenVPN is an open-source application that allows you to create a secure private network over the public internet. In this tutorial, we will show you how to step-by-step install and configure OpenVPN on CentOS 8. And we will implement the certificate-based OpenVPN authentication.
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How to Setup IKEv2 VPN Using Strongswan and Let's Encrypt on CentOS 8
Author: Muhammad Arul • Tags: centos, linux, security • Comments: 8 • Published: Nov 26, 2019Strongswan is an open source multiplatform IPSec implementation. It's an IPSec-based VPN solution that focuses on strong authentication mechanisms. In this tutorial, I will show you how to install an IPSec VPN server using Strongswan. We will create an IKEv2 VPN server with the 'EAP-MSCHAPv2' authentication and be using Letsencrypt certificates on CentOS 8 server.
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How to manage Let's Encrypt SSL/TLS certificates with certbot
Author: Karl Wakim • Tags: linux, security • Comments: 1 • Published: Nov 01, 2019Certbot is a free and open-source utility mainly used for managing SSL/TLS certificates from the Let's Encrypt certificate authority. It is available for most UNIX and UNIX-like operating systems, including GNU/Linux, FreeBSD, OpenBSD and OS X.
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How to Obscure Network Ports with a Port Knocking Sequence on Debian 10
Author: Karl Wakim • Tags: debian, networking, security • Comments: 2 • Published: Oct 30, 2019Port knocking is a method of dynamically opening network ports by "knocking" (i.e. connecting) on a predefined sequence of ports. This is especially useful for obscuring an open network port from port scanning since the port in question will be closed unless the port knocking sequence is executed.
