Raspberry Pi4 HA Kubernetes Cluster

Description

This repository will install all necessary packages needed for Kubernetes. Installation will use ansible and kubeadm with Weave CNI networking.
Ansible will also install HAProxy with Keepalived to enable HA clustering.

Prerequisites

Raspberry Pi 4 with Ubuntu 19.10 (tested on this setup)
1 - 3 Master nodes
X amount of worker nodes
Ansible 2.x

Hosts file

Hosts file should be in format (example):

[masters]
kube-master-1.k8s.localhost   ansible_host=192.168.1.10    keepalive_role=MASTER
kube-master-2.k8s.localhost   ansible_host=192.168.1.11    keepalive_role=SLAVE
kube-master-3.k8s.localhost   ansible_host=192.168.1.12    keepalive_role=SLAVE

[nodes]
kube-node-1.k8s.localhost   ansible_host=192.168.1.20
kube-node-2.k8s.localhost   ansible_host=192.168.1.21
kube-node-3.k8s.localhost   ansible_host=192.168.1.22

ansible_host parameter is not required if you have nodes in DNS.
Keepalive_role will determine which host acts as primary master for haproxy and keepalived.

Variables

Variables can be defined in group_vars/all.yml
These are current default but they can be changed if needed

kubeadm_version: 1.16.4-00
kubernetes_version: stable-1.16
kubernetes_endpoint: 192.168.88.111
haproxy_port: 6666
pod_cidr: 10.244.0.0/16

Usage

First run playbook for masters then to nodes.

Master

ansible-playbook k8s-master.yml

Nodes

ansible-playbook k8s-nodes.yml

Upgrade

Set the desired versions into the upgrade-cluster.yml file and shoot:

ansible-playbook upgrade-cluster.yml

jlehtimaki/rpi4_k8s_cluster_ansible