Kubernetes can be installed just about anywhere Linux runs on. It could be either physical or virtual machines. In this lab we are going to focus on RASPBIAN.
This lab will walk you through provisioning the Raspberry Pi software required for running a H/A Kubernetes cluster.
The steps in this tutorial are "AS IS" without any warranties and support. I am not responsible for any misconfiguration or damages to the Raspberry Pi equipment involved on this tutorial.
The OS for each Raspberry Pi is RASPBIAN JESSIE LITE 2017-03-02 This is a small image with a nice size OS perfect for small servers.
A total of 5 Raspberry Pis will be configured. Here are their names and IP addresses:
| Hostname | IP address |
|---|---|
| controller0 | 10.0.1.90 |
| controller1 | 10.0.1.91 |
| controller2 | 10.0.1.92 |
| worker0 | 10.0.1.93 |
| worker1 | 10.0.1.94 |
This GPU configuration has worked well for previous server setups I've done.
sudo sh -c 'echo "gpu_mem=16" >> /boot/config.txt'
I add 1GB of swap space. Some people seem concerned that frequent writes to the MicroSD card will make it fail quickly. I therefore decided to set the swappiness such that it only uses the swap as a last resort.
sudo mkdir /swap
sudo dd if=/dev/zero of=/swap/swapfile bs=1M count=1024
sudo mkswap /swap/swapfile
sudo swapon /swap/swapfile
sudo sh -c 'echo "/swap/swapfile none swap sw 0 0" >> /etc/fstab'
sudo sh -c 'echo "vm.swappiness = 1" >>/etc/sysctl.conf'
In my exprience, connectivity between each server would be highly improved if connected directly to LAN network instead of Wi-Fi.
sudo sh -c "cat >>/etc/hosts <<EOF
10.0.1.94 controller0
10.0.1.95 controller1
10.0.1.96 controller2
10.0.1.97 worker0
10.0.1.98 worker1
EOF
"
Remember to run these steps on
controller0,controller1,controller2,worker0, andworker1