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This article provides a detailed guide for how to deploy PowerDNS cluster on Ubuntu VPS servers. What is PowerDNS? PowerDNS is an open-source DNS (Domain Name System) server software that provides both authoritative and recursive DNS services. It’s widely used by ISPs, hosting providers, and enterprises due to its performance, scalability, and flexibility. Key Features of PowerDNS: Authoritative Server: Serves DNS records for domains. Supports a wide range of backends: MySQL, PostgreSQL, SQLite, LDAP, and more. Ideal for dynamic DNS environments and large-scale deployments. Recursor (Recursive DNS Server): Handles DNS lookups for client systems. Focused on speed and security. Can be used standalone or alongside the authoritative server. High Performance: Known for its efficient query handling. Suitable for handling millions of queries per second. Extensible: Built-in Lua scripting support for custom behavior. APIs for automation and integration. DNSSEC Support: Provides tools for signing zones and validating queries. Web-based and API Management: Integration with tools like PowerDNS-Admin for user-friendly DNS management. Common Use Cases: Hosting companies managing customer DNS zones. Enterprises with complex internal DNS setups. Service providers needing a scalable DNS solution. How to Deploy PowerDNS Cluster on Ubuntu VPS Servers This setup will use: PowerDNS Authoritative Server with a MySQL backend Multiple VPS nodes: one primary (master), one or more secondaries (slaves) Optional: Web-based interface like Poweradmin for easier DNS management ✅ Prerequisites Before starting, make sure: You're using Ubuntu 22.04 or newer You have at least 2 VPS servers (more if you want a larger cluster) You have root or sudo access on all servers You’ve set up static IPs and hostnames You have MySQL (or MariaDB) installed Ports 53 (UDP/TCP) and 3306 (TCP) are open between nodes ⚙️ Overview of Architecture Primary DNS Server (Master): Handles zone creation and updates Secondary DNS Servers (Slaves): Pull zone data from master using AXFR MySQL Database: Central backend for zone records (can be replicated if needed) 🛠 Step-by-Step Deployment To deploy PowerDNS cluster on Ubuntu VPS servers, follow the steps provided below: Install PowerDNS and MySQL on the Master sudo apt update sudo apt install pdns-server pdns-backend-mysql mariadb-server -y Secure MySQL and Create PowerDNS Database sudo mysql_secure_installation Then log into MySQL: sudo mysql -u root -p Run these SQL commands: CREATE DATABASE powerdns; GRANT ALL ON powerdns.* TO 'pdns'@'localhost' IDENTIFIED BY 'StrongPasswordHere'; FLUSH PRIVILEGES; EXIT; Import PowerDNS Schema Download schema: wget https://raw.githubusercontent.com/PowerDNS/pdns/master/modules/gmysqlbackend/schema/schema.mysql.sql Import it: mysql -u pdns -p powerdns < schema.mysql.sql Configure PowerDNS to Use MySQL Edit PowerDNS config: sudo nano /etc/powerdns/pdns.conf Add/modify: launchgmysql gmysql-host127.0.0.1 gmysql-userpdns gmysql-passwordStrongPasswordHere gmysql-dbnamepowerdns Restart PowerDNS: sudo systemctl restart pdns Add Zones and Records (Master) You can insert zones manually into the database or use Poweradmin (optional, covered later). Example to add a zone: INSERT INTO domains (name, type) VALUES ('example.com', 'MASTER'); Set Up Secondary DNS Server (Slave) Install PowerDNS sudo apt update sudo apt install pdns-server pdns-backend-bind -y Configure PowerDNS as a Slave Edit /etc/powerdns/pdns.conf: launchbind bind-config/etc/powerdns/named.conf Create /etc/powerdns/named.conf: sudo nano /etc/powerdns/named.conf Example slave zone: zone "example.com" { type slave; masters { MASTER_IP; }; file "example.com.zone"; }; Restart PowerDNS: sudo systemctl restart pdns Allow Zone Transfers on Master In your MySQL database, set also_notify and allow_notify_from_master if needed. Or manually allow AXFR in pdns.conf: allow-axfr-ipsSLAVE_IP also-notifySLAVE_IP Restart the master PowerDNS: sudo systemctl restart pdns Install Poweradmin on Master Install Apache and PHP sudo apt install apache2 php php-mysql libapache2-mod-php unzip -y Download Poweradmin wget https://github.com/poweradmin/poweradmin/archive/master.zip unzip master.zip sudo mv poweradmin-master /var/www/html/poweradmin Setup and configure in browser Visit: http://YOUR_MASTER_IP/poweradmin/install Follow the steps and provide DB info. When done, delete the install directory. 🔍 Validation & Testing Use dig @MASTER_IP example.com ANY to query records Use dig @SLAVE_IP example.com AXFR to test zone transfers Check logs: /var/log/syslog or journalctl -u pdns 🔐 Hardening Tips Enable UFW and limit to specific IPs Change default MySQL port if exposed Use secure passwords and disable remote root MySQL login Use DNSSEC (PowerDNS supports it) ✅ Summary Component Role Master VPS Authoritative DNS, MySQL backend Slave VPS Secondary, pulls zones via AXFR MySQL Stores DNS records Poweradmin Web UI for DNS mgmt Conclusion You now know how to deploy PowerDNS cluster on Ubuntu VPS servers.

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