Linux Port Numbers Every DevOps Engineer Must Know in 2026 [SSH, HTTP, HTTPS, MySQL]
Linux Port Numbers Every DevOps Engineer Must Know in 2026 [SSH, HTTP, HTTPS, MySQL]
Mastering Linux port numbers is a non-negotiable skill for any aspiring DevOps Engineer. In Tutorial #4 of our Linux series, we dive deep into the networking essentials you'll use daily in production environments. Whether you're configuring firewalls, setting up reverse proxies, or troubleshooting database connectivity, knowing these ports by heart is a must.
We cover the important Linux ports and explain the difference between TCP and UDP protocols in a way that actually sticks.
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🛠️ What You Will Learn in This Lesson:
🔥 Why Port 22 (SSH) is the gateway to your infrastructure.
🔥 The transition from Port 80 (HTTP) to Port 443 (HTTPS) in 2026 security standards.
🔥 Database networking: Port 3306 (MySQL/MariaDB) and why it matters.
🔥 How to check open ports using ss, netstat, and lsof commands.
🔥 Common TCP vs UDP use cases for DevOps workflows.
📌 Timestamps & Key Moments:
00:00 - Why Networking Ports Matter (Quick Intro)
00:45 - Ports vs. Sockets Explained (The Difference)
01:43 - Port Ranges: Well-Known, Registered & Dynamic
02:50 - Common Ports You MUST Know (SSH, FTP, DNS)
04:05 - Web Traffic Ports: How DHCP, HTTP & HTTPS Work
04:52 - Email Protocols: Setting up SMTP, POP3 & IMAP
07:12 - Crucial Services: NTP, NetBIOS, SNMP & SMB Ports
08:30 - Summary: Best Practices for Port Security
📋 DevOps Port Cheat Sheet:
Remote Access:
22 – SSH (Secure Shell) — Essential for Linux Admin
3389 – RDP (Remote Desktop Protocol) — Windows/GUI Access
Web Traffic:
80 – HTTP (Unencrypted Web)
443 – HTTPS (Secure Web/SSL)
Databases:
3306 – MySQL / MariaDB
5432 – PostgreSQL
Email Services:
25 – SMTP (Simple Mail Transfer Protocol)
587/465 – Secure SMTP (Modern Email Submission)
DevOps Tools:
8080 – Jenkins / Apache Tomcat / Alternate HTTP
9090 – Prometheus (Monitoring)
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