Kubernetes Ansible with KubeAdm

Quick and dirty ansible for deploying kubernetes with kubeadm.

Based on this guide https://www.arubacloud.com/tutorial/how-to-create-kubernetes-cluster-with-kubeadm-and-ansible-ubuntu-20-04.aspx

Status

• Basic ansible to deploy a cluster with a single master (prepared for HA)
• HA Control Plane
• Removal of hardcoded variables such as Service/Pod CIDR Ranges

Components

For CNI we use kube-router.

Rather than using Docker for the container runtime, we use containerd.

We are using kube-router to expose ClusterIP services to the network, running a highly available control plane, this is W.I.P.

Deployment phases

Pre-reqs

Create an ansible inventory in hosts. Each host should be running Ubuntu 20.04.

Generate a SSH key

ssh-keygen -t rsa -m PEM -f npf-ansible -C "npf-ansible"

Add SSH key to agent ssh-add npf-ansible

Copy SSH key to each host ssh-copy-id -i npf-ansible npf@172.20.22.11

Phase 1: Initial setup

Execute ansible playbook initial ansible-playbook -i hosts initial.yml --ask-become-pass

Phase 2: Install kubernetes dependencies

Execute ansible playbook deps ansible-playbook -i hosts deps.yml --ask-become-pass

Phase 3: Create kubernetes cluster

Execute ansible playbook deps ansible-playbook -i hosts kubeadm-init.yml --ask-become-pass

Phase 4: Join worker nodes to cluster

Execute ansible playbook deps ansible-playbook -i hosts kubeadm-join.yml --ask-become-pass