16Bitt / ansible-k3s

Basic ansible scripts for setting up a k3s raspberry pi clusster

Raspberry Pi Ansible for k3s

This is some Ansible I used to provision and install k3s in a 3-node cluster on my Raspberry Pi 3+'s. This is messy and does some things I would not recommend in a production environment like disabling selinux. That said, maybe someone else will find these configs useful!

Dependencies

• An Ansible master machine
• At least one Raspberry Pi running CentOS 7
• A user in the wheel group on each host named ca
• wheel is set to NOPASSWD ALL in /etc/sudoers
• All of your servers added to your ansible hosts file
• Key authentication for the ca user on each node (I'd recommend completely disabling password auth)

CentOS on the pi has a root user login open via SSH -- make sure to disable this before opening any port to the internet.

Usage

# Test that your servers are available
ansible-playbook servers-up.yaml

# Install base packages, disable selinux, and enable cgroups in the kernel command line
ansible-playbook default-provision.yaml

# Make sure to reboot your servers for selinux changes to take effect!

# Enable default services
ansible-playbook enable-services.yaml

# Pull k3s onto the servers, enable systemd units, and fire the nodes up!
ansible-playbook k3s-install.yaml

Assuming this worked successfully, change the host in kubecfg and you should have cluster access!

KUBECONFIG=./kubecfg kubectl get nodes

Issues

• --docker does not work since k3s uses a different cgroups driver than docker under systemd
• Currently, selinux support is expiremental and I didn't have enought time to dedicate to working around it.