Ansible Managed Raspberry Pi Cluster Hosting K8's (Kids Next Door themed!)

My Setup

• 4 Raspberry Pi 4 Model B 4GB running 64-bit Ubuntu 20.04 (worker nodes)
• 1 Raspberry Pi 4 Model B 2GB running 64-bit Ubuntu 20.04 (head node)
• 1 2-TB HDD plugged into head node
• 5 port network switch

Setup

• May need to give your vscode/terminal/whatever certain file access on Mac

Flash and connect

For each Pi:

1. Flash 64-but Ubuntu Server 20.04 onto SD card
2. ansible-playbook playbooks/setup-flashed-sd-card.yml -i inventory --limit HOST --ask-vault-pass where host is defined in your inventory file
3. Put SD card into your Pi and boot
4. ssh ubuntu@static-ip and change the password on login and disconnect
5. ssh-copy-id -i ~/.ssh/id_ed25519.pub ubuntu@static-ip (now you can run playbooks against that host)

Update

ansible-playbook playbooks/update/enable.yml -i inventory

Mount HDD and Ensure Access

On the head node once the HDD has been plugged in:

sudo mkfs.ext4 /dev/sda1
sudo mkdir /clusterdata
sudo chown nobody.nogroup -R /clusterdata
sudo chmod 777 -R /clusterdata

Need the UUID of this drive....

blkid | grep sda1 will give us that UUID="8ff90304-1038-4d72-a211-fe5257feb00d" Now need to edit /etc/fstab and add UUID=8ff90304-1038-4d72-a211-fe5257feb00d /clusterdata ext4 defaults 0 2 Now sudo mount -a

Loose permissions...

sudo chown nobody.nogroup -R /clusterdata
sudo chmod -R 766 /clusterdata

Install NFS Server

sudo apt install nfs-kernel-server -y

Add /clusterdata 10.0.0.0/24(rw,sync,no_root_squash,no_subtree_check) to /etc/exports

And finally run sudo exportfs -a

Now for each worker node:

Install sudo apt install nfs-common -y

Create + Mount:

sudo mkdir /clusterdata
sudo chown nobody.nogroup /clusterdata
sudo chmod -R 777 /clusterdata

add 10.0.0.200:/clusterdata /clusterdata nfs defaults 0 0 to /etc/fstab

Finally sudo mount -a

Install Docker