TL;DR Introduction to Keepalived Installation of Keepalived on Debian 13 Configuration of Keepalived Setting Up Virtual IP Addresses Testing Failover Scenarios Verification TL;DR Keepalived provides a robust solution for implementing failover and high availability in Debian 13 environments. By leveraging VRRP (Virtual Router Redundancy Protocol), Keepalived allows multiple servers to work together, ensuring that if one server fails, another can take over seamlessly.

TL;DR Introduction to OpenSCAP Installation of OpenSCAP Running Compliance Scans Reviewing Scan Results Cautions Safe Defaults Automating Compliance Checks Verification TL;DR OpenSCAP is a powerful tool for performing compliance audits on Debian 13 systems. It helps ensure that your server adheres to security standards and best practices. Here’s a quick guide to get you started:

TL;DR Installation of GoAccess Configuring GoAccess Setting Up Fail2ban Integrating GoAccess with Fail2ban Verification Rollback TL;DR To monitor logs effectively with GoAccess and integrate it with Fail2ban on Debian 13, follow these concise steps: Install GoAccess: Ensure you have GoAccess installed to analyze web server logs. Use the following command:

TL;DR Understanding Port Scanning Installing and Configuring Fail2Ban Using iptables for Blocking Scans Monitoring Logs for Suspicious Activity Using Snort for Advanced Detection Configuration Running Snort Caution Safe Defaults Verification TL;DR To detect and block port scanning on your Debian 13 server, follow these concise steps: Install and Configure Fail2Ban: This tool helps to monitor logs and block suspicious IP addresses.

TL;DR Installation of rclone Configuring rclone for Cloud Storage Setting Up Encryption Uploading and Downloading Encrypted Files Downloading Files Additional Options Safe Defaults Verification of Encrypted Files Rollback Procedures TL;DR To use rclone with encrypted cloud storage on Debian 13, follow these concise steps: Install rclone: Ensure you have the latest version of rclone installed.

TL;DR Understanding Bastion Hosts Prerequisites Installing and Configuring the Bastion Host Implementing Security Best Practices Verification TL;DR To set up a bastion host for secure remote administration on Debian 13, follow these key steps: Install OpenSSH Server: Ensure the SSH server is installed and running. sudo apt update && sudo apt install openssh-server # Install OpenSSH sudo systemctl enable ssh # Enable SSH to start on boot sudo systemctl start ssh # Start SSH service Configure SSH for Security: Edit the SSH configuration to enhance security.

TL;DR Installation of WireGuard Configuration of WireGuard Server Configuration of WireGuard Client Firewall and Routing Setup Verification Rollback TL;DR To set up WireGuard VPN on Debian 13, follow these concise steps: Install WireGuard: Ensure your package list is updated and install WireGuard: sudo apt update && sudo apt install wireguard Generate Key Pairs: Create a private and public key for the server:

TL;DR Understanding Rate Limiting Setting Up IPTables on Debian 13 Creating Basic Rate Limiting Rules Implementing Advanced Rate Limiting Techniques TL;DR To implement advanced rate limiting using IPTables on Debian 13, follow these concise steps to protect your server from abuse while ensuring legitimate traffic is not hindered. Install IPTables (if not already installed):

TL;DR Introduction to Auditd Installation of Auditd Configuration of Auditd Monitoring and Analyzing Audit Logs Setting Up Alerts for Security Events Verification TL;DR Auditd is a powerful tool for tracking security events on Debian 13 systems. It provides detailed logs of system calls and can help identify unauthorized access or changes.

TL;DR Understanding AppArmor Installing AppArmor on Debian 13 Creating and Modifying AppArmor Profiles Modifying an Existing Profile Reloading Profiles Cautions and Safe Defaults Loading and Enforcing Profiles Verification Rollback TL;DR To configure AppArmor profiles for web servers on Debian 13, follow these summarized steps: Install AppArmor: Ensure AppArmor is installed and running on your server.

TL;DR Understanding the Sudoers File Editing the Sudoers File Safely Implementing User and Group Privileges Logging and Auditing Sudo Activity Restricting Sudo Access Verification TL;DR To effectively manage the sudoers file on Debian 13, follow these best practices: Use visudo for Editing: Always edit the sudoers file using visudo to prevent syntax errors that could lock you out of sudo access.

TL;DR Understanding Docker Security Installing Docker with Security in Mind Configuring Docker Daemon for Enhanced Security Implementing Container Security Best Practices Monitoring and Logging for Security TL;DR To secure Docker containers on Debian 13, follow these essential steps: Install Docker securely: Ensure you install Docker from the official Debian repositories to avoid vulnerabilities in third-party packages.

TL;DR Understanding Systemd and Its Importance Key Hardening Techniques Verification TL;DR To enhance the security of critical services on your Debian 13 server using systemd, follow these essential hardening steps: Limit Service Permissions: Use User and Group directives in your service files to run services with the least privilege.

TL;DR Understanding rsync Security Features Setting Up rsync with SSH Safe Defaults: Implementing rsync with Firewall Rules Using rsync with Encryption Verification TL;DR To securely deploy rsync on Debian 13, follow these key practices: Use SSH for Transport: Always use SSH to encrypt data in transit. This prevents eavesdropping and man-in-the-middle attacks.

TL;DR Setting Up Let’s Encrypt on Debian 13 Common Gotchas During Installation Renewal Process and Automation Verification of SSL Configuration Rollback Procedures TL;DR To set up Let’s Encrypt with Nginx on Debian 13, follow these key steps to avoid common pitfalls: Install Certbot: Ensure you have the necessary packages installed.

TL;DR Installation of Uptime Kuma Configuring Uptime Kuma Setting Up Alerts Step 2: Configure Postfix Step 3: Set Up Email Alerts in Uptime Kuma Caution Safe Defaults Verification TL;DR Uptime Kuma is a self-hosted monitoring solution that provides an easy way to track the uptime of your services. This guide will help you set it up on a Debian 13 server with alerts, all while keeping costs low.

TL;DR Understanding Zero-Downtime Reloads Setting Up Nginx for Zero-Downtime Implementing Rolling Updates Verification of Updates Rollback Procedures Deployment Checklist TL;DR To achieve zero-downtime Nginx reloads and rolling updates on Debian 13, follow these essential steps: Use the nginx -t Command: Always test your Nginx configuration before reloading to prevent service interruptions.

TL;DR Understanding Cron Jobs Identifying Existing Cron Jobs Best Practices for Cron Job Management Monitoring and Logging Cron Jobs Verifying Cron Job Functionality TL;DR To maintain optimal cron job hygiene on your Debian 13 production servers, follow these key practices: Review Existing Cron Jobs: Regularly audit your cron jobs to ensure they are necessary and functioning as intended.

TL;DR Understanding SSH Key Types Generating and Deploying ed25519 SSH Keys Disabling Password Authentication Installing and Configuring Fail2ban Verification TL;DR To secure your SSH access on Debian 13, follow these key steps: Generate ed25519 SSH Keys: Use the ed25519 algorithm for stronger security. Avoid using passwords for your SSH keys to streamline access.

TL;DR Introduction to Restic and Backblaze B2 Installation of Required Packages Configuring Backblaze B2 Setting Up Restic Repository Automating Backups with Cron 2 * * * /usr/bin/restic backup /path/to/backup –repo b2:your_bucket_name:your_repo_name Breakdown of the cron job: Cautions: TL;DR To set up automated backups on your Debian 13 server using Restic and Backblaze B2, follow these concise steps:

TL;DR Understanding TLS 1.3 Installing Nginx with TLS 1.3 Support Configuring Nginx for TLS 1.3 Testing and Validating TLS 1.3 Configuration Monitoring and Maintaining TLS Security Rollback Procedures TL;DR To secure your Nginx server with TLS 1.3 on Debian 13, follow these best practices: Update Packages: Ensure your system and Nginx are up to date to leverage the latest security features.

TL;DR System Updates and Package Management Firewall Configuration SSH Hardening Fail2Ban Installation Regular Security Audits Verification TL;DR To harden your Debian 13 server for internet-facing applications, follow these essential steps: Update the System: Ensure all packages are up-to-date to mitigate vulnerabilities. sudo apt update && sudo apt upgrade -y # Update package lists and upgrade installed packages Configure the Firewall: Use ufw to allow only necessary ports.

TL;DR Introduction to UFW and Fail2ban Installing UFW Configuring UFW Rules Installing Fail2ban Configuring Fail2ban Verification TL;DR To quickly secure your Debian 13 server, follow these steps to set up UFW (Uncomplicated Firewall) and Fail2ban. Install UFW and Fail2ban: Ensure both packages are installed on your system. sudo apt update && sudo apt install ufw fail2ban -y # Install UFW and Fail2ban Configure UFW: Start by setting default policies to deny incoming connections and allow outgoing ones.

TL;DR Introduction to Keepalived Installation of Keepalived on Debian 13 Configuration of Keepalived Setting Up Virtual IP Addresses Testing Failover Scenarios Verification TL;DR Keepalived provides a robust solution for implementing failover and high availability in Debian 13 environments. By leveraging VRRP (Virtual Router Redundancy Protocol), Keepalived allows multiple servers to work together, ensuring that if one server fails, another can take over seamlessly.

TL;DR Introduction to OpenSCAP Installation of OpenSCAP Running Compliance Scans Reviewing Scan Results Cautions Safe Defaults Automating Compliance Checks Verification TL;DR OpenSCAP is a powerful tool for performing compliance audits on Debian 13 systems. It helps ensure that your server adheres to security standards and best practices. Here’s a quick guide to get you started:

TL;DR Installation of GoAccess Configuring GoAccess Setting Up Fail2ban Integrating GoAccess with Fail2ban Verification Rollback TL;DR To monitor logs effectively with GoAccess and integrate it with Fail2ban on Debian 13, follow these concise steps: Install GoAccess: Ensure you have GoAccess installed to analyze web server logs. Use the following command:

TL;DR Understanding Port Scanning Installing and Configuring Fail2Ban Using iptables for Blocking Scans Monitoring Logs for Suspicious Activity Using Snort for Advanced Detection Configuration Running Snort Caution Safe Defaults Verification TL;DR To detect and block port scanning on your Debian 13 server, follow these concise steps: Install and Configure Fail2Ban: This tool helps to monitor logs and block suspicious IP addresses.

TL;DR Installation of rclone Configuring rclone for Cloud Storage Setting Up Encryption Uploading and Downloading Encrypted Files Downloading Files Additional Options Safe Defaults Verification of Encrypted Files Rollback Procedures TL;DR To use rclone with encrypted cloud storage on Debian 13, follow these concise steps: Install rclone: Ensure you have the latest version of rclone installed.

TL;DR Understanding Bastion Hosts Prerequisites Installing and Configuring the Bastion Host Implementing Security Best Practices Verification TL;DR To set up a bastion host for secure remote administration on Debian 13, follow these key steps: Install OpenSSH Server: Ensure the SSH server is installed and running. sudo apt update && sudo apt install openssh-server # Install OpenSSH sudo systemctl enable ssh # Enable SSH to start on boot sudo systemctl start ssh # Start SSH service Configure SSH for Security: Edit the SSH configuration to enhance security.

TL;DR Installation of WireGuard Configuration of WireGuard Server Configuration of WireGuard Client Firewall and Routing Setup Verification Rollback TL;DR To set up WireGuard VPN on Debian 13, follow these concise steps: Install WireGuard: Ensure your package list is updated and install WireGuard: sudo apt update && sudo apt install wireguard Generate Key Pairs: Create a private and public key for the server:

TL;DR Understanding Rate Limiting Setting Up IPTables on Debian 13 Creating Basic Rate Limiting Rules Implementing Advanced Rate Limiting Techniques TL;DR To implement advanced rate limiting using IPTables on Debian 13, follow these concise steps to protect your server from abuse while ensuring legitimate traffic is not hindered. Install IPTables (if not already installed):

TL;DR Introduction to Auditd Installation of Auditd Configuration of Auditd Monitoring and Analyzing Audit Logs Setting Up Alerts for Security Events Verification TL;DR Auditd is a powerful tool for tracking security events on Debian 13 systems. It provides detailed logs of system calls and can help identify unauthorized access or changes.

TL;DR Understanding AppArmor Installing AppArmor on Debian 13 Creating and Modifying AppArmor Profiles Modifying an Existing Profile Reloading Profiles Cautions and Safe Defaults Loading and Enforcing Profiles Verification Rollback TL;DR To configure AppArmor profiles for web servers on Debian 13, follow these summarized steps: Install AppArmor: Ensure AppArmor is installed and running on your server.

TL;DR Understanding the Sudoers File Editing the Sudoers File Safely Implementing User and Group Privileges Logging and Auditing Sudo Activity Restricting Sudo Access Verification TL;DR To effectively manage the sudoers file on Debian 13, follow these best practices: Use visudo for Editing: Always edit the sudoers file using visudo to prevent syntax errors that could lock you out of sudo access.

TL;DR Understanding Docker Security Installing Docker with Security in Mind Configuring Docker Daemon for Enhanced Security Implementing Container Security Best Practices Monitoring and Logging for Security TL;DR To secure Docker containers on Debian 13, follow these essential steps: Install Docker securely: Ensure you install Docker from the official Debian repositories to avoid vulnerabilities in third-party packages.

TL;DR Understanding Systemd and Its Importance Key Hardening Techniques Verification TL;DR To enhance the security of critical services on your Debian 13 server using systemd, follow these essential hardening steps: Limit Service Permissions: Use User and Group directives in your service files to run services with the least privilege.

TL;DR Understanding rsync Security Features Setting Up rsync with SSH Safe Defaults: Implementing rsync with Firewall Rules Using rsync with Encryption Verification TL;DR To securely deploy rsync on Debian 13, follow these key practices: Use SSH for Transport: Always use SSH to encrypt data in transit. This prevents eavesdropping and man-in-the-middle attacks.

TL;DR Setting Up Let’s Encrypt on Debian 13 Common Gotchas During Installation Renewal Process and Automation Verification of SSL Configuration Rollback Procedures TL;DR To set up Let’s Encrypt with Nginx on Debian 13, follow these key steps to avoid common pitfalls: Install Certbot: Ensure you have the necessary packages installed.

TL;DR Installation of Uptime Kuma Configuring Uptime Kuma Setting Up Alerts Step 2: Configure Postfix Step 3: Set Up Email Alerts in Uptime Kuma Caution Safe Defaults Verification TL;DR Uptime Kuma is a self-hosted monitoring solution that provides an easy way to track the uptime of your services. This guide will help you set it up on a Debian 13 server with alerts, all while keeping costs low.

TL;DR Understanding Zero-Downtime Reloads Setting Up Nginx for Zero-Downtime Implementing Rolling Updates Verification of Updates Rollback Procedures Deployment Checklist TL;DR To achieve zero-downtime Nginx reloads and rolling updates on Debian 13, follow these essential steps: Use the nginx -t Command: Always test your Nginx configuration before reloading to prevent service interruptions.

TL;DR Understanding Cron Jobs Identifying Existing Cron Jobs Best Practices for Cron Job Management Monitoring and Logging Cron Jobs Verifying Cron Job Functionality TL;DR To maintain optimal cron job hygiene on your Debian 13 production servers, follow these key practices: Review Existing Cron Jobs: Regularly audit your cron jobs to ensure they are necessary and functioning as intended.

TL;DR Understanding SSH Key Types Generating and Deploying ed25519 SSH Keys Disabling Password Authentication Installing and Configuring Fail2ban Verification TL;DR To secure your SSH access on Debian 13, follow these key steps: Generate ed25519 SSH Keys: Use the ed25519 algorithm for stronger security. Avoid using passwords for your SSH keys to streamline access.

TL;DR Introduction to Restic and Backblaze B2 Installation of Required Packages Configuring Backblaze B2 Setting Up Restic Repository Automating Backups with Cron 2 * * * /usr/bin/restic backup /path/to/backup –repo b2:your_bucket_name:your_repo_name Breakdown of the cron job: Cautions: TL;DR To set up automated backups on your Debian 13 server using Restic and Backblaze B2, follow these concise steps:

TL;DR Understanding TLS 1.3 Installing Nginx with TLS 1.3 Support Configuring Nginx for TLS 1.3 Testing and Validating TLS 1.3 Configuration Monitoring and Maintaining TLS Security Rollback Procedures TL;DR To secure your Nginx server with TLS 1.3 on Debian 13, follow these best practices: Update Packages: Ensure your system and Nginx are up to date to leverage the latest security features.

TL;DR System Updates and Package Management Firewall Configuration SSH Hardening Fail2Ban Installation Regular Security Audits Verification TL;DR To harden your Debian 13 server for internet-facing applications, follow these essential steps: Update the System: Ensure all packages are up-to-date to mitigate vulnerabilities. sudo apt update && sudo apt upgrade -y # Update package lists and upgrade installed packages Configure the Firewall: Use ufw to allow only necessary ports.

TL;DR Introduction to UFW and Fail2ban Installing UFW Configuring UFW Rules Installing Fail2ban Configuring Fail2ban Verification TL;DR To quickly secure your Debian 13 server, follow these steps to set up UFW (Uncomplicated Firewall) and Fail2ban. Install UFW and Fail2ban: Ensure both packages are installed on your system. sudo apt update && sudo apt install ufw fail2ban -y # Install UFW and Fail2ban Configure UFW: Start by setting default policies to deny incoming connections and allow outgoing ones.

TL;DR Introduction to Keepalived Installation of Keepalived on Debian 13 Configuration of Keepalived Setting Up Virtual IP Addresses Testing Failover Scenarios Verification TL;DR Keepalived provides a robust solution for implementing failover and high availability in Debian 13 environments. By leveraging VRRP (Virtual Router Redundancy Protocol), Keepalived allows multiple servers to work together, ensuring that if one server fails, another can take over seamlessly.

TL;DR Introduction to OpenSCAP Installation of OpenSCAP Running Compliance Scans Reviewing Scan Results Cautions Safe Defaults Automating Compliance Checks Verification TL;DR OpenSCAP is a powerful tool for performing compliance audits on Debian 13 systems. It helps ensure that your server adheres to security standards and best practices. Here’s a quick guide to get you started:

TL;DR Installation of GoAccess Configuring GoAccess Setting Up Fail2ban Integrating GoAccess with Fail2ban Verification Rollback TL;DR To monitor logs effectively with GoAccess and integrate it with Fail2ban on Debian 13, follow these concise steps: Install GoAccess: Ensure you have GoAccess installed to analyze web server logs. Use the following command:

TL;DR Understanding Port Scanning Installing and Configuring Fail2Ban Using iptables for Blocking Scans Monitoring Logs for Suspicious Activity Using Snort for Advanced Detection Configuration Running Snort Caution Safe Defaults Verification TL;DR To detect and block port scanning on your Debian 13 server, follow these concise steps: Install and Configure Fail2Ban: This tool helps to monitor logs and block suspicious IP addresses.

TL;DR Installation of rclone Configuring rclone for Cloud Storage Setting Up Encryption Uploading and Downloading Encrypted Files Downloading Files Additional Options Safe Defaults Verification of Encrypted Files Rollback Procedures TL;DR To use rclone with encrypted cloud storage on Debian 13, follow these concise steps: Install rclone: Ensure you have the latest version of rclone installed.

TL;DR Understanding Bastion Hosts Prerequisites Installing and Configuring the Bastion Host Implementing Security Best Practices Verification TL;DR To set up a bastion host for secure remote administration on Debian 13, follow these key steps: Install OpenSSH Server: Ensure the SSH server is installed and running. sudo apt update && sudo apt install openssh-server # Install OpenSSH sudo systemctl enable ssh # Enable SSH to start on boot sudo systemctl start ssh # Start SSH service Configure SSH for Security: Edit the SSH configuration to enhance security.

TL;DR Installation of WireGuard Configuration of WireGuard Server Configuration of WireGuard Client Firewall and Routing Setup Verification Rollback TL;DR To set up WireGuard VPN on Debian 13, follow these concise steps: Install WireGuard: Ensure your package list is updated and install WireGuard: sudo apt update && sudo apt install wireguard Generate Key Pairs: Create a private and public key for the server:

TL;DR Understanding Rate Limiting Setting Up IPTables on Debian 13 Creating Basic Rate Limiting Rules Implementing Advanced Rate Limiting Techniques TL;DR To implement advanced rate limiting using IPTables on Debian 13, follow these concise steps to protect your server from abuse while ensuring legitimate traffic is not hindered. Install IPTables (if not already installed):

TL;DR Introduction to Auditd Installation of Auditd Configuration of Auditd Monitoring and Analyzing Audit Logs Setting Up Alerts for Security Events Verification TL;DR Auditd is a powerful tool for tracking security events on Debian 13 systems. It provides detailed logs of system calls and can help identify unauthorized access or changes.

TL;DR Understanding AppArmor Installing AppArmor on Debian 13 Creating and Modifying AppArmor Profiles Modifying an Existing Profile Reloading Profiles Cautions and Safe Defaults Loading and Enforcing Profiles Verification Rollback TL;DR To configure AppArmor profiles for web servers on Debian 13, follow these summarized steps: Install AppArmor: Ensure AppArmor is installed and running on your server.

TL;DR Understanding the Sudoers File Editing the Sudoers File Safely Implementing User and Group Privileges Logging and Auditing Sudo Activity Restricting Sudo Access Verification TL;DR To effectively manage the sudoers file on Debian 13, follow these best practices: Use visudo for Editing: Always edit the sudoers file using visudo to prevent syntax errors that could lock you out of sudo access.

TL;DR Understanding Docker Security Installing Docker with Security in Mind Configuring Docker Daemon for Enhanced Security Implementing Container Security Best Practices Monitoring and Logging for Security TL;DR To secure Docker containers on Debian 13, follow these essential steps: Install Docker securely: Ensure you install Docker from the official Debian repositories to avoid vulnerabilities in third-party packages.

TL;DR Understanding Systemd and Its Importance Key Hardening Techniques Verification TL;DR To enhance the security of critical services on your Debian 13 server using systemd, follow these essential hardening steps: Limit Service Permissions: Use User and Group directives in your service files to run services with the least privilege.

TL;DR Understanding rsync Security Features Setting Up rsync with SSH Safe Defaults: Implementing rsync with Firewall Rules Using rsync with Encryption Verification TL;DR To securely deploy rsync on Debian 13, follow these key practices: Use SSH for Transport: Always use SSH to encrypt data in transit. This prevents eavesdropping and man-in-the-middle attacks.

TL;DR Setting Up Let’s Encrypt on Debian 13 Common Gotchas During Installation Renewal Process and Automation Verification of SSL Configuration Rollback Procedures TL;DR To set up Let’s Encrypt with Nginx on Debian 13, follow these key steps to avoid common pitfalls: Install Certbot: Ensure you have the necessary packages installed.

TL;DR Installation of Uptime Kuma Configuring Uptime Kuma Setting Up Alerts Step 2: Configure Postfix Step 3: Set Up Email Alerts in Uptime Kuma Caution Safe Defaults Verification TL;DR Uptime Kuma is a self-hosted monitoring solution that provides an easy way to track the uptime of your services. This guide will help you set it up on a Debian 13 server with alerts, all while keeping costs low.

TL;DR Understanding Zero-Downtime Reloads Setting Up Nginx for Zero-Downtime Implementing Rolling Updates Verification of Updates Rollback Procedures Deployment Checklist TL;DR To achieve zero-downtime Nginx reloads and rolling updates on Debian 13, follow these essential steps: Use the nginx -t Command: Always test your Nginx configuration before reloading to prevent service interruptions.

TL;DR Understanding Cron Jobs Identifying Existing Cron Jobs Best Practices for Cron Job Management Monitoring and Logging Cron Jobs Verifying Cron Job Functionality TL;DR To maintain optimal cron job hygiene on your Debian 13 production servers, follow these key practices: Review Existing Cron Jobs: Regularly audit your cron jobs to ensure they are necessary and functioning as intended.

TL;DR Understanding SSH Key Types Generating and Deploying ed25519 SSH Keys Disabling Password Authentication Installing and Configuring Fail2ban Verification TL;DR To secure your SSH access on Debian 13, follow these key steps: Generate ed25519 SSH Keys: Use the ed25519 algorithm for stronger security. Avoid using passwords for your SSH keys to streamline access.

TL;DR Introduction to Restic and Backblaze B2 Installation of Required Packages Configuring Backblaze B2 Setting Up Restic Repository Automating Backups with Cron 2 * * * /usr/bin/restic backup /path/to/backup –repo b2:your_bucket_name:your_repo_name Breakdown of the cron job: Cautions: TL;DR To set up automated backups on your Debian 13 server using Restic and Backblaze B2, follow these concise steps:

TL;DR Understanding TLS 1.3 Installing Nginx with TLS 1.3 Support Configuring Nginx for TLS 1.3 Testing and Validating TLS 1.3 Configuration Monitoring and Maintaining TLS Security Rollback Procedures TL;DR To secure your Nginx server with TLS 1.3 on Debian 13, follow these best practices: Update Packages: Ensure your system and Nginx are up to date to leverage the latest security features.

TL;DR System Updates and Package Management Firewall Configuration SSH Hardening Fail2Ban Installation Regular Security Audits Verification TL;DR To harden your Debian 13 server for internet-facing applications, follow these essential steps: Update the System: Ensure all packages are up-to-date to mitigate vulnerabilities. sudo apt update && sudo apt upgrade -y # Update package lists and upgrade installed packages Configure the Firewall: Use ufw to allow only necessary ports.

TL;DR Introduction to UFW and Fail2ban Installing UFW Configuring UFW Rules Installing Fail2ban Configuring Fail2ban Verification TL;DR To quickly secure your Debian 13 server, follow these steps to set up UFW (Uncomplicated Firewall) and Fail2ban. Install UFW and Fail2ban: Ensure both packages are installed on your system. sudo apt update && sudo apt install ufw fail2ban -y # Install UFW and Fail2ban Configure UFW: Start by setting default policies to deny incoming connections and allow outgoing ones.