🔌 Essential Port Numbers for Every DevOps Engineer

[hirenpatel1903]

🔌 Essential Port Numbers for Every DevOps Engineer

A complete DevOps Port Numbers & Cheat Sheet repository covering networking, DevOps tools, cloud, databases, CI/CD, containers, Kubernetes, and monitoring.

📌 Designed for DevOps Engineers, Cloud Engineers, SREs, Freshers, and Interview Preparation.

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⭐ Why This Repository?

• ✅ DevOps Interview Ready
• ✅ Daily Operations & Troubleshooting
• ✅ Firewall & Security Configuration
• ✅ Beginner to Advanced Reference
• ✅ SEO Optimized for GitHub Trending

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📌 Table of Contents

1. Common Protocols & Services
2. DevOps & Automation Tools
3. Databases
4. Cloud, Monitoring & Security Tools
5. Version Control
6. Messaging & Queue Systems
7. Miscellaneous Services
8. DevOps Interview Questions
9. DevOps Cheat Sheet (Linux, Docker, Kubernetes, AWS)

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🌐 1. Common Protocols & Services

Service	Port	Purpose
HTTP	80	Unsecured web traffic
HTTPS	443	Secure web traffic
SSH	22	Secure remote access
FTP	20, 21	File transfer
SFTP	22	Secure file transfer
Telnet	23	Legacy remote access
DNS	53	Domain resolution
SMTP	25, 587, 465	Send emails
IMAP	143, 993	Receive emails
POP3	110, 995	Receive emails

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🤖 2. DevOps & Automation Tools

Tool	Port	Purpose
Jenkins	8080	CI/CD automation
Docker API	2375 / 2376	Docker daemon
Kubernetes API	6443	K8s cluster management
Terraform Enterprise	8800	IaC backend

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🗄️ 3. Databases

Database	Port
MySQL	3306
PostgreSQL	5432
MongoDB	27017
Redis	6379
Elasticsearch	9200 / 9300

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☁️ 4. Cloud, Monitoring & Security Tools

Tool	Port
Prometheus	9090
Grafana	3000
Consul	8500 / 8600
Vault	8200
Zabbix	10050 / 10051

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🔄 5. Version Control

Git Access	Port
Git SSH	22
Git HTTPS	443

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📩 6. Messaging & Queue Systems

Tool	Port
RabbitMQ	5672 / 15672
Kafka	9092

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🧩 7. Miscellaneous Services

Service	Port	Purpose
NTP	123	Time sync
LDAP	389 / 636	Directory services
SNMP	161 / 162	Network monitoring
RDP	3389	Windows remote desktop

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🎯 8. DevOps Interview Questions (Must-Know)

🔹 Networking

• What is the difference between HTTP and HTTPS?
• Why is SSH preferred over Telnet?
• What happens if port 443 is blocked?

🔹 Docker

• Which port does Docker use internally?
• Difference between 2375 and 2376?
• How do you expose a container port?

🔹 Kubernetes

• Why does Kubernetes use port 6443?
• What is the role of API Server?

🔹 CI/CD

• Why does Jenkins run on 8080?
• How do you secure Jenkins?

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📚 9. DevOps Cheat Sheet (Quick Reference)

🐧 Linux

• SSH: 22
• SCP/SFTP: 22
• Cron logs: /var/log/syslog
• Check open ports: netstat -tulnp

🐳 Docker

• Docker API: 2375 / 2376
• Container expose: -p host:container
• Inspect ports: docker ps

☸️ Kubernetes

• API Server: 6443
• NodePort Range: 30000–32767
• kubelet: 10250

☁️ AWS (Common)

• EC2 SSH: 22
• RDS MySQL: 3306
• Load Balancer HTTPS: 443
• Security Groups = Firewall

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🧠 Key Takeaway

Mastering DevOps port numbers helps you
🔹 Debug faster
🔹 Secure systems better
🔹 Crack DevOps interviews confidently

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