create-ha-cluster

Setup a multi-master Kubernetes cluster with kubeadm

This will set up a new multi-master Kubernetes cluster that has

• 3 masters, each master has 2 CPUs and 2 GBs RAM
• 3 workers, each worker has 2 CPUs and 2 GBs RAM
• 2 load balancers, each load balancer has 1 CPU and 1 GB RAM

Prerequisites

Before you want to try this on your local, here are requirements

• Your computer must have at least 14 CPUs, 14 GBs RAM
• A public key in .ssh/id_rsa.pub in your home directory
• Directly download Virtualbox and install, or use homebrew

  brew install --cask virtualbox
  

• Vagrant

  brew install --cask vagrant
  

• (Optional) Vagrant Manager

  brew install --cask vagrant-manager
  

Provision VMs

cd create-ha-cluster
vagrant up

Let's ssh into the first master VM

ssh ci@172.16.1.11

Setup load balancer

ansible-playbook -i playbook/lb_inventory.yml playbook/lb_playbook.yml --extra-vars "cluster_vip=172.16.0.16"

Let's ssh into the load balancer VM by the VIP, and check haproxy service status

ssh ci@172.16.0.16
systemctl status haproxy

Setup Kubernetes cluster

ansible-playbook -i playbook/cluster_inventory.yml playbook/cluster_playbook.yml --extra-vars "cluster_vip=172.16.0.16"

Let's ssh into the first master VM, and verify the cluster

ssh ci@172.16.1.11
kubectl get nodes

Download kubeconfig to your local

mkdir ~/.kube-local
scp ci@172.16.1.11:/home/ci/.kube/config ~/.kube-local/config
export KUBECONFIG=$HOME/.kube-local/config && kubectl get nodes