How to Secure a VPS Server with CrowdSec (2026 Guide)
Step-by-step guide to secure a VPS server with CrowdSec. Covers engine install, firewall bouncer (iptables & nftables), SSH protection, Nginx monitoring, and AppSec WAF.
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Category: Linux
47 guides in this category
How To Do SSH Port Forwarding (SSH Tunneling) in Linux
Learn SSH port forwarding in Linux: local, remote, and dynamic tunneling. Set up persistent tunnels with systemd, SSH config, and security best practices.
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How To Access Remote Servers with SSH ProxyJump and Jump Hosts
Learn SSH ProxyJump and jump host setup for secure remote server access. Step-by-step bastion host configuration, security hardening, and troubleshooting.
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How to Identify Processes Using Swap Space in Linux
Find which processes use swap space in Linux with smem, /proc/VmSwap, and shell scripts. Covers swappiness tuning, swap troubleshooting, and container swap tracking.
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Configure Postfix to Send Email Using External SMTP Servers
Configure Postfix to relay emails through external SMTP servers like Brevo, Mailgun, or Amazon SES. Step-by-step setup guide with an automated script.
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Ghostty Terminal: A Complete Setup Guide for Modern Mac Development
Install and configure Ghostty terminal on Mac, then explore the libghostty ecosystem — cmux and 100+ terminals built on Ghostty's engine — plus prompts, zsh plugins, and tmux.
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100+ Essential Linux Commands You MUST Know (2026 Guide)
Master the Linux command line with this cheat sheet of 100+ essential Linux commands. Covers file management, networking, system admin, and modern CLI tools, all with practical examples for 2026.
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How to Secure an SSH Server in Linux: Hardening Guide
Secure your Linux SSH server with this hardening guide. Covers key-based auth, sshd_config best practices, fail2ban, firewall rules, and OpenSSH security.
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Add a New Drive to Ubuntu LVM and Mount It Permanently
Add a new drive to Ubuntu LVM: pvcreate, vgcreate, lvcreate, ext4 format, and persistent mount with fstab nofail. Step-by-step guide for Ubuntu 24.04.
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Extract Text From PDF on Linux Command Line (pdftotext)
Extract text from PDF files on Linux command line using pdftotext. Covers install, layout modes, password-protected PDFs, OCR for scanned docs & batch scripts.
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