kubelab

A simple lab using Vagrant and Virtualbox to learn to setup and manage a Kubernetes environments based on Kubeadm.

Requirements:

Vagrant: https://www.vagrantup.com/downloads

Virtualbox: https://www.virtualbox.org/wiki/Downloads

The Vagrant images are based on Ubuntu Bionic64. There's no real preference for Ubuntu besides me wanting to use it. Please feel free to refer to the Kubeadm documentation for instrucions on installing on other Linux distributions.

Clone and Install

Clone this repo.

Edit the Vagrantfile to suit your resource requirements. In this configuration, there's a 1 master, 2 worker node cluster.

MASTER_CPU = 2
MASTER_RAM = 2048

WORKER_CPU = 4
WORKER_RAM = 4096

WORKER_COUNT = 2

BOX_IMAGE = "ubuntu/bionic64"

Vagrant.configure("2") do |config|

  config.vm.define "master", primary: true do |kubeconfig|
    kubeconfig.vm.box = BOX_IMAGE
    kubeconfig.vm.hostname = "master"
    kubeconfig.vm.network "private_network", type: "dhcp"
    kubeconfig.vm.provider "virtualbox" do |vb|
      vb.cpus = MASTER_CPU
      vb.memory = MASTER_RAM
    end
    kubeconfig.vm.provision "shell", inline: "sudo /vagrant/installKubernetes.sh master"
  end

  (1..WORKER_COUNT).each do |i|
    config.vm.define "worker#{i}" do |kubeconfig|
      kubeconfig.vm.box = BOX_IMAGE
      kubeconfig.vm.hostname = "worker#{i}"
      kubeconfig.vm.network "private_network", type: "dhcp"
      kubeconfig.vm.provider "virtualbox" do |vb|
        vb.cpus = WORKER_CPU
        vb.memory = WORKER_RAM
      end
      kubeconfig.vm.provision "shell", inline: "sudo /vagrant/installKubernetes.sh worker"
    end
  end

  config.vm.box_check_update = false
end

Once the resource configuration has been set, bring up the Vagrant environment

vagrant up

Login to Master Node

vagrant ssh master

sudo su -

kubectl get nodes -o wide

Kubectl (Optional)

For those of you not interested in using the root account. You can run the following command to configure the kubectl config for the vagrant user.

vagrant ssh master

/vagrant/installKubernetes.sh user

Worker Nodes (Optional)

You can connect to the worker nodes by running the command below.

vagrant ssh worker1