Linux Server Hardening Reference Compendium 37 resources

Server Security
Reference Guide

Curated tutorials, guides, and documentation for securing, configuring, and hardening Ubuntu/Linux VPS servers. Covers initial setup through advanced hardening strategies.

37Resources
7Categories
10+Sources
01 — Initial Setup & User Management
01
Ubuntu 22.04
Super User
Initial Server Setup with Ubuntu 22.04
do.co/2JL7yVT
→ 02
More Details
Ubuntu 22.04
Initial Server Setup with Ubuntu 22.04 — Supplemental
serverspace.io/support/help/initial-configuration-ubuntu
→ 03
Credentials
How to Change Sudo or Root Password in Ubuntu
phoenixnap.com/kb/change-root-password-ubuntu
→ 04
User Admin
How to Add and Delete Users on Ubuntu 20.04
digitalocean.com › tutorials › how-to-add-and-delete-users
→
02 — SSH Configuration & Keys
05
SSH
How to Change Your Default SSH Port
hostwinds.com/tutorials/change-ssh-port
→ 06
Primary
SSH Keys
How to Set Up SSH Keys on Ubuntu 22.04
digitalocean.com › tutorials › how-to-set-up-ssh-keys
→ 07
Ubuntu 24.04
Quick Guide to Enabling SSHD on Ubuntu 24.04
linuxconfig.org/quick-guide-to-enabling-ssh-on-ubuntu-24-04
→ 08
SSH
Banner
How to Show Security Warning Message to SSH Unauthorized Users
tecmint.com/ssh-warning-message-before-login
→ 09
2FA
OTP
One-Time Passwords (2FA) for Two-Factor Authentication with SSH on Ubuntu 18.04
linode.com/docs/security/authentication/one-time-passwords
→
03 — Firewall (UFW)
10
Firewall
UFW
How to Set Up a Firewall with UFW on Ubuntu 22.04
digitalocean.com › tutorials › how-to-set-up-a-firewall-with-ufw
→ 11
Extra
UFW
Securing SSH Access with UFW: Specific Ports and IPs
dohost.us › securing-ssh-access-with-ufw-specific-ports
→ 12
Tailscale
UFW
Tailscale Ultra — Use UFW to lock down an Ubuntu server
tailscale.com/docs/how-to/secure-ubuntu-server-with-ufw
→ 13
Cloudflare
IP Allow-list
Allow Cloudflare IP Addresses
developers.cloudflare.com/fundamentals/concepts/cloudflare-ip-addresses
→
04 — Fail2Ban & Intrusion Prevention
14
Fail2Ban
Ubuntu 22.04
How to Install Fail2Ban on Ubuntu Server 22.04
digitalocean.com › tutorials › how-to-protect-ssh-with-fail2ban
→ 15
Fail2Ban
Ubuntu 24.04
How to Install Fail2Ban on Ubuntu Server 24.04
tecmint.com/install-fail2ban-ubuntu-24-04
→ 16
Fail2Ban
Deep Dive
Using Fail2Ban to Secure Your Server — Complete Tutorial
linode.com/docs/guides/using-fail2ban-to-secure-your-server
→
05 — General Hardening & VPS Security
17
Hardening
VPS
Steps to Securing Your VPS
geekscircuit.com/steps-to-securing-your-vps
→ 18
Hardening
25 Hardening Security Tips for Linux Servers
bit.ly/2ZnPFRH
→ 19
ClamAV
Security
How to Secure Your Linux Server — includes ClamScan
contabo.com/blog/how-to-secure-your-linux-server
→ 20
Advanced
VPS
How to Secure a VPS Server: Step-by-Step Hardening for Real-World Threats
dchost.com › how-to-secure-a-vps-server-step-by-step-hardening
→ 21
Updates
How to Keep Ubuntu 22.04 Servers Updated
digitalocean.com › tutorials › how-to-keep-ubuntu-22-04-servers-updated
→ 22
Auto-Updates
Ubuntu Docs
Automatic Updates — Ubuntu Server Guide (pg 40–431)
help.ubuntu.com/lts/serverguide/automatic-updates.html
→ 23
Auto-Updates
Enable Automatic Security Updates
geekscircuit.com › steps-to-securing-your-vps #block-incoming-traffic
→ 24
Snap
Livepatch
Snap Module Install — Canonical Livepatch
snapcraft.io/canonical-livepatch
→
06 — Hostname, Swap & System Config
25
Hostname
How to Change Hostname on Ubuntu 22.04
linuxize.com/post/how-to-change-hostname-on-ubuntu-22-04
→ 26
Hostname
Akamai
Configure a Custom Hostname — Set the Timezone
techdocs.akamai.com/cloud-computing/docs/set-up-and-secure-a-compute-instance
→ 27
Swap
Memory
How to Add Swap Space on Ubuntu 24.04
digitalocean.com › tutorials › how-to-add-swap-space
→
07 — Tools & Server Apps (SERVA2LS)
28
Tailscale
VPN
Setting up Tailscale on Ubuntu 20.04 LTS
tailscale.com/kb/1039/install-ubuntu-2004
→ 29
Docker
Monitoring
CTOP — Top-like Interface for Monitoring Docker Containers
tecmint.com/ctop-monitor-docker-containers
→ 30
Homebrew
Package Mgr
How to Install Homebrew on Ubuntu (26.04, 24.04, 22.04)
linuxcapable.com/how-to-install-homebrew-on-ubuntu-linux
→ 31
Bun
JavaScript
How to Install Bun on Ubuntu (26.04, 24.04, 22.04)
linuxcapable.com/how-to-install-bun-on-ubuntu-linux
→ 32
Google Cloud
CLI
How to Install Google Cloud CLI on Ubuntu (26.04, 24.04, 22.04)
linuxcapable.com/how-to-install-google-cloud-cli-on-ubuntu-linux
→ 33
GitHub Copilot
AI CLI
How to Install GitHub Copilot CLI on Ubuntu
linuxcapable.com/how-to-install-github-copilot-cli-on-ubuntu-linux
→ 34
Kernel
XanMod
How to Install XanMod Kernel on Ubuntu Linux
linuxcapable.com/install-xanmod-kernel-on-ubuntu-linux
→ 35
Tested ✓
APT-Fast
How to Install APT-Fast on Ubuntu
linuxcapable.com/how-to-install-apt-fast-on-ubuntu-linux
→ 36
Tested ✓
NMAP
How to Install NMAP on Ubuntu Linux
linuxcapable.com/how-to-install-nmap-on-ubuntu-linux
→ 37
Wireshark
Network
How to Install Wireshark on Ubuntu Linux
linuxcapable.com/how-to-install-wireshark-on-ubuntu-linux
→