Linux

Total 6 Posts
Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds.

SSH GeoBlocker

The sshGeoBlocker bash script uses geoiplookup to get the location of an IP address from a MaxMind GeoLite2 database. Combining this script with a fail2ban sshd jail, IP addresses can be blocked after a certain number of unsuccessful connection attempts.

SSL Certificates with LetsEncrypt

This tutorial explains how to use LetsEncrypt and acme.sh to create SSL certificates. In addition, snippets for a secure SSL configuration and secure transport headers are provided and explained. A hybrid solution, using RSA and ECDSA certificates, will be created.

Bash: The JMRemover

This article explains how to use the find command to enumerate the number of files or folders in a directory, and how to delete old backup files or directories using the same technique.

Bash: Looping over Files and Folders

This article explains how to loop over files and folders in Linux.

Protecting Nginx with Fail2ban

An introduction on how to use fail2ban to protect nginx against bots and brute-force attacks.

A Focal Fossa in a Digital Ocean

DigitalOcean is an excellent service provider. Focal Fossa is an easy-to-use Linux distribution. This is a quick introduction on how to securely set up a server on Digital Ocean.
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