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GRINNTEC

Linux Network Tools

grinntec/mkdocs

Linux Network Tools¶

This page provides a guide on using common network tools like Netcat, Telnet, DNS utilities, Curl, Ping, and Git in Kubernetes support pods for troubleshooting and support tasks, with real-world command examples. These tools enable various network diagnostics, remote access, DNS queries, HTTP requests, and version control directly from the command line.

These support pods install common network tools. Here are some real-world use cases for each tool.

Netcat (nc)¶

Port Scanning: Identify open ports on a remote system.
```
nc -zv 192.168.1.1 1-1000
```
Simple Client-Server Communication: Test network connectivity by simulating client-server interactions.
```
nc -l -p 12345 # On the server side
nc 192.168.1.1 12345 # On the client side
```

File Transfer: Transfer files between systems.

nc -l -p 12345 > received_file.txt # On the receiving side
nc 192.168.1.1 12345 < file_to_send.txt # On the sending side

Debugging: Monitor and debug network connections.
```
nc -v -l -p 12345
```

Telnet¶

Remote System Access: Connect to remote systems for administration and troubleshooting.
```
telnet remote.server.com 23
```
Network Diagnostics: Test network services and connectivity.
```
telnet 192.168.1.1 80
```
Legacy System Management: Manage older systems that do not support more secure protocols like SSH.
```
telnet legacy.system.com
```

DNS Utilities (dnsutils)¶

DNS Query: Query DNS servers for domain name resolution.
```
nslookup example.com
```
DNS Record Management: Create, update, and delete DNS records.
```
dig example.com MX
```
DNS Debugging: Diagnose DNS-related issues.
```
dig +trace example.com
```

Curl¶

HTTP Requests: Make HTTP requests to web servers for testing APIs and web services.
```
curl -X GET https://api.example.com/data
```

File Transfer: Download or upload files to/from remote servers.

curl -O https://example.com/file.zip
curl -T upload_file.zip ftp://ftp.example.com --user username:password

Command-line Web Browser: Browse the web directly from the command line.
```
curl https://example.com
```

Ping¶

Network Connectivity Test: Check if a host is reachable on the network.
```
ping google.com
```
Latency Measurement: Measure round-trip time for packets to and from a host.
```
ping -c 10 google.com
```
Troubleshooting: Diagnose network issues and verify connectivity.
```
ping 192.168.1.1
```

Git¶

Version Control: Track changes in source code during software development.
```
git init
git add .
git commit -m "Initial commit"
```
Collaboration: Collaborate with other developers by sharing code repositories.
```
git clone https://github.com/user/repo.git
git push origin main
```

Project Management: Manage project versions and branches efficiently.

git branch feature-branch
git checkout feature-branch
git merge main