# How-To-Secure-A-Linux-Server | IMTheNachoMan | Knowledge Base | Instagit

An evolving how-to guide for securing a Linux server.

GitHub Stars: 27.3k

Repository: https://github.com/imthenachoman/How-To-Secure-A-Linux-Server

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## Articles

### [How to Configure Separate iptables Logging for Security Monitoring](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-configure-separate-iptables-logging-for-security-monitoring)

Learn to configure separate iptables logging for enhanced security monitoring. This guide shows how to use log prefixes and rsyslog to manage firewall logs efficiently and prevent disk issues.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Harden Nginx Web Server Configuration for Security: A Complete Checklist](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-harden-nginx-web-server-configuration-for-security)

Harden Nginx security with a complete checklist. Implement seven critical security headers like CSP and disable version disclosure for robust protection.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Implement a Fake Password System for Linux Security Using pam-duress](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-implement-a-fake-password-system-for-linux-security)

Implement a fake password system for Linux security with pam-duress. Create a covert backdoor for destructive or deceptive actions using a panic password and signed scripts.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Perform Security Auditing with Lynis on Linux Servers](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-perform-security-auditing-with-lynis)

Learn how to perform security auditing with Lynis on your Linux server. Lynis scans configurations, packages, and kernel parameters to identify vulnerabilities and provide remediation advice.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Configure Logwatch for Linux System Log Analysis: A Complete Setup Guide](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-configure-logwatch-for-linux-system-log-analysis)

Configure Logwatch for Linux system log analysis with this complete setup guide. Learn to install, preview reports, and schedule email summaries.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Use Rkhunter for Rootkit Detection in Linux: Complete Setup Guide](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-use-rkhunter-for-rootkit-detection-in-linux)

Learn how to use Rkhunter for rootkit detection in Linux with this complete setup guide. Secure your system by identifying suspicious files and backdoors effectively.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Install and Configure ClamAV for Linux Antivirus Protection](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-install-and-configure-clamav-for-linux-antivirus)

Secure your Linux server by learning to install and configure ClamAV. This guide covers package installation, configuration file backups, service enablement, and on-demand malware scanning with clamscan.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Set Up AIDE for File Integrity Monitoring on Linux](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-set-up-aide-for-file-integrity-monitoring)

Set up AIDE for robust file integrity monitoring on Linux. Learn how to create a filesystem baseline and detect unauthorized changes with daily automated checks. Secure your server today.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Automate Security Updates and Alerts in Linux](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-automate-security-updates-and-alerts-in-linux)

Automate Linux security updates and alerts with unattended-upgrades apt-listchanges and apticron. Achieve hands-free patching and stay informed about system changes effortlessly.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Enforce Strong Password Policies on a Linux Server Using pam_pwquality](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-enforce-strong-password-policies-on-a-linux-server)

Learn to enforce strong password policies on your Linux server using pam_pwquality. Secure your system by setting complexity requirements and rejecting weak passwords automatically.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Configure an NTP Client for Secure Time Synchronization on Linux](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-configure-ntp-client-for-secure-time-synchronization)

Configure your Linux NTP client for secure time synchronization using systemd-timesyncd or ntp. Restrict UDP 123 traffic to protect your server and ensure accurate timestamps for security.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Use FireJail to Sandbox Linux Applications: Complete Setup Guide](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-use-firejail-to-sandbox-linux-applications)

Learn how to use FireJail to sandbox Linux applications. This guide provides a complete setup for running programs in secure, restricted environments with ease.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Limit su Command Access Using Linux Group Permissions](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-limit-su-command-access-using-linux-group-permissions)

Secure your Linux server by limiting su command access. Learn how to use Linux group permissions and dpkg-statoverride to restrict execution to authorized users.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Restrict Sudo Privileges to Specific User Groups in Linux: A Complete Guide](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-restrict-sudo-privileges-to-specific-user-groups-in-linux)

Learn to restrict sudo privileges to specific user groups in Linux. Secure your server by granting access only to authorized users with our complete guide.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Install and Configure UFW Firewall on Linux: A Complete Guide](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-install-and-configure-ufw-firewall-on-linux)

Learn to install and configure UFW firewall on Linux with our complete guide. Secure your server by setting policies, allowing services, and enabling the firewall. Get started now.

- Tags: how-to-guide
- Published: 2026-05-14

### [How to Enable Google Authenticator for SSH 2FA on Linux](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-enable-google-authenticator-for-ssh-2fa)

Secure Linux SSH with Google Authenticator. Easily enable SSH 2FA by installing the PAM module, generating secrets, and configuring PAM and SSHD for TOTP security.

- Tags: how-to-guide
- Published: 2026-05-14

### [Mozilla's OpenSSH Guidelines for sshd_config Hardening on Linux Servers](/imthenachoman/How-To-Secure-A-Linux-Server/what-are-mozillas-openssh-guidelines-for-sshd_config-hardening)

Learn Mozilla's essential OpenSSH guidelines for sshd_config hardening. Secure your Linux servers with strong cryptography and audit logging to prevent attacks.

- Tags: best-practices
- Published: 2026-05-14

### [How to Set Up Ed25519 SSH Keys for Secure Linux Server Authentication](/imthenachoman/How-To-Secure-A-Linux-Server/how-to-set-up-ed25519-ssh-keys-for-authentication)

Learn how to set up Ed25519 SSH keys for secure Linux server authentication. Generate keys, copy them to your server, and disable password login for enhanced security.

- Tags: how-to-guide
- Published: 2026-05-14