☑️Day 4: Networking For DevOps

🔹Table Of content :

✅IP Addressing

✅DNS (Domain Name System)

✅MAC Address

✅Subnetting

✅Ping

✅Traceroute

✅Netstat

✅SSH (Secure Shell)

Networking is a crucial skill in DevOps, enabling communication between services, servers, and infrastructure. Here’s a short summary of what to focus on as you dive into networking:

IP Addressing: Understand how IP addresses work (IPv4 vs. IPv6) and how they identify devices in a network.
DNS: Learn how DNS resolves domain names to IP addresses for seamless service communication.
MAC Address: Know how MAC addresses uniquely identify network interfaces on devices.
Subnetting: Study how subnetting divides networks to improve security and traffic management.
Ping & Traceroute: Master these tools to test connectivity and troubleshoot latency issues.
Netstat: Use netstat to monitor active connections and open ports on servers.
SSH: Familiarize yourself with SSH for secure remote access to servers.

Tip: Start practicing these basics in both Windows and Linux environments as they’re essential for handling cloud services, monitoring systems, and managing infrastructure in DevOps!

✅1. IP Addressing

Concept:
IP addresses are unique identifiers for devices on a network, allowing seamless communication between them.

Types:
- IPv4: A common format like 192.168.0.1 (32-bit address).
- IPv6: A newer format like fe80::1ff:fe23:4567:890a (128-bit address).

Real-Time DevOps Example:
In a production environment, assigning static IP addresses to servers ensures they retain consistent network identities, crucial for service-to-service communication.

Windows: Use ipconfig to check the IP address.
Linux: Use ip a to view IP configurations.

✅2. DNS (Domain Name System)

Concept:
DNS translates human-readable domain names (like myapp.com) into machine-readable IP addresses (like 192.168.0.10).

Real-Time DevOps Example:
When deploying microservices, DNS can be set up to map services to specific domains, making them easily accessible within your network.

Windows: Use nslookup myapp.com.
Linux: Use dig myapp.com.

✅3. MAC Address

Concept:
A MAC address is a unique hardware identifier for each network interface, ensuring that no two devices share the same address on a network.

Real-Time DevOps Example:
In cloud environments, monitoring MAC addresses helps track devices and manage network security, preventing unauthorized access.

Windows: Use getmac to display MAC addresses.
Linux: Use ifconfig or ip link show.

✅4. Subnetting

Concept:
Subnetting divides larger networks into smaller, more manageable ones, improving network efficiency and security.

Real-Time DevOps Example:
By creating separate subnets for production, development, and testing environments, you can better control and isolate network traffic, ensuring smooth operations.

Example: A /24 subnet mask (255.255.255.0) allows for 256 IP addresses, ideal for a small team setup.
Windows/Linux: View subnet details using ipconfig (Windows) or ifconfig (Linux).

✅5. Ping

Concept:
Ping sends ICMP packets to a destination to check if it is reachable and measure the round-trip time.

Real-Time DevOps Example:
Use ping to verify the availability of a server before deploying new services or features, ensuring the infrastructure is stable.

Windows/Linux: Run ping <IP or domain> to test network connectivity.

✅6. Traceroute

Concept:
Traceroute shows the path that packets take from your machine to a remote destination, providing insights into network hops and latency.

Real-Time DevOps Example:
To troubleshoot latency issues, traceroute can reveal where delays occur between your servers and external clients.

Windows: Use tracert myapp.com.
Linux: Use traceroute myapp.com.

✅7. Netstat

Concept:
Netstat displays active network connections, open ports, and routing tables, useful for monitoring network activity.

Real-Time DevOps Example:
During security audits, netstat helps identify unexpected open ports or rogue services that could pose security risks.

Windows/Linux: Use netstat -an to display all active connections and listening ports.

✅8. SSH (Secure Shell)

Concept:
SSH is a secure protocol that allows administrators to connect remotely to servers, manage systems, deploy code, and troubleshoot issues.

Real-Time DevOps Example:
SSH is used to manage cloud-based Linux servers, making it an essential tool for any DevOps engineer handling remote deployments.

Windows: Use ssh user@hostname in PowerShell or tools like PuTTY.
Linux: Use ssh user@hostname in the terminal.

🚀Stay tuned for more updates on my DevOps journey! 📅

Feel free to reach out to me if you have any questions or need any more help. Let’s connect, learn, and succeed together!

Happy Learning!😊

#90DaysOfDevOps

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