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Jules
Jules

Posted on • Originally published at juliantellez.com

Raspberry Pi Kubernetes Cluster: SSH into the Nodes (Issue #3)

#kubernetes #homelab #raspberrypi

Welcome to the Raspberry Pi Kubernetes home lab series. A bite sized informative guide to help you provision a cluster from scratch. By now you should have 3+ nodes running the latest version of Ubuntu. Refer to the previous guide if you would like to know more.

This issue walks you through communicating with your Raspberry Pi nodes through SSH.

Requirements

  • A Raspberry Pi node with the latest version of Ubuntu, connected to either your home router or an Ethernet switch
  • SSH should be enabled on the node

Install Nmap 

brew install nmap
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Nmap ("Network Mapper") is an open source tool for network exploration and security auditing, designed to rapidly scan networks.

Find the device's IP address 

# Find the router's IP
netstat -nr | grep default

# Inspect nodes on your local network
nmap -sP 192.168.0.1/24
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From the snippet above, the nodes are on 192.168.0.[24-26].

SSH into nodes manually 

# ssh into device, password is usually "ubuntu"
ssh ubuntu@192.168.0.26
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SSH into nodes with private keys 

ssh-keygen -t rsa -b 4096
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Add the SSH key to the node:

ssh-copy-id -i ~/.ssh/ansible ubuntu@192.168.0.26
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SSH with the RSA key:

ssh -i ~/.ssh/ansible ubuntu@192.168.0.26
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Conclusion

You are now ready to start your Kubernetes setup. It is important that you know how to access the nodes independently and that you can reach them both via SSH keys and as a root user.

Leave a comment if you have any questions. The next step will be installing dependencies on the nodes. Happy coding.

First published in my LinkedIn newsletter, Built from Scratch.

This was originally published on juliantellez.com. It is part of my newsletter on video, streaming, and building reliable systems from scratch: the architecture, the tradeoffs, and the occasional 3am incident.

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