13. Networking#
Overview
Modern system administration and DevOps work heavily involve network operations: checking connectivity, transferring files, executing commands remotely, and monitoring network services. This chapter covers essential networking tools and techniques for shell scripting.
Topics:
Network diagnostics: ping, curl, wget
Secure file transfer: scp, rsync
Remote execution via SSH
Network automation and monitoring
Practical remote operations workflows
These skills are essential for:
Server administration and maintenance
Deployment automation
Data synchronization across systems
Infrastructure monitoring
Disaster recovery operations
What You'll Learn
By the end of this chapter, you will be able to:
✓ Test network connectivity and diagnose issues ✓ Transfer files securely between systems ✓ Execute commands remotely via SSH ✓ Automate remote operations and deployments ✓ Work with network services and APIs ✓ Synchronize data across systems ✓ Build infrastructure automation scripts ✓ Handle remote failures and recovery
Chapter Map
Section |
Topic |
Key Concepts |
|---|---|---|
1302 |
Network Diagnostics |
ping, nc, curl, network testing |
1303 |
SSH & Remote Execution |
SSH keys, remote commands, tunneling |
1304 |
File Transfer |
scp, rsync, secure synchronization |
1305 |
API Integration |
curl, jq, webhooks, JSON parsing |
1306 |
Lab: Infrastructure Automation |
Multi-server operations |
Why This Matters
Network operations enable modern infrastructure automation:
Deployments: Automate application rollouts across servers
Data synchronization: Keep systems in sync
Monitoring: Aggregate metrics from multiple hosts
Disaster recovery: Automated failover and recovery
Cloud management: Manage multiple cloud instances
Real-world impact: A deployment script can update 100 servers in minutes without manual SSH sessions.
Prerequisites
You should already understand:
Bash scripting (Chapters 5-8)
Error handling (Chapter 11)
Basic networking (TCP/IP, ports, DNS)
SSH and basic Linux administration
What You'll Learn
By the end of this chapter, you will be able to:
✓ Test network connectivity and diagnose issues ✓ Transfer files securely between systems ✓ Execute commands remotely via SSH ✓ Automate remote operations and deployments ✓ Work with network services and APIs ✓ Synchronize data across systems ✓ Build infrastructure automation scripts ✓ Handle remote failures and recovery
Chapter Map
Section |
Topic |
Key Concepts |
|---|---|---|
1302 |
Network Diagnostics |
ping, nc, curl, network testing |
1303 |
SSH & Remote Execution |
SSH keys, remote commands, tunneling |
1304 |
File Transfer |
scp, rsync, secure synchronization |
1305 |
API Integration |
curl, jq, webhooks, JSON parsing |
1306 |
Lab: Infrastructure Automation |
Multi-server operations |
Why This Matters
Network operations enable modern infrastructure automation:
Deployments: Automate application rollouts across servers
Data synchronization: Keep systems in sync
Monitoring: Aggregate metrics from multiple hosts
Disaster recovery: Automated failover and recovery
Cloud management: Manage multiple cloud instances
Real-world impact: A deployment script can update 100 servers in minutes without manual SSH sessions.
Prerequisites
You should already understand:
Bash scripting (Chapters 5-8)
Error handling (Chapter 11)
Basic networking (TCP/IP, ports, DNS)
SSH and basic Linux administration