Vagrant + Multi-Node MicroK8S - README.md

Using Vagrant with Multi-Node MicroK8S to experiment with Kubernetes

This script (using Vagrant) is used to build a pair of Ubuntu based virtual machines that have the MicroK8S setup of Kubernetes.

It also installs docker, and sets up aliases for kubectl in line with the MicroK8S documentation.

Please note that this script relies on the fact that Vagrant transfers files in /vagrant to the host file system, which we can then use to setup the second node.

If you only want a single node version, here's a similar repository.

Rationale

On my Windows machine, I wanted to follow the advice of a colleague and run MicroK8S to experiment with Kubernetes. I followed the advice on MicroK8S, and tried to use Multipass and found that it recommends using Hyper-V on Windows Hosts. Unfortunately, on my machine, I also use VirtualBox for some machines I've worked with, so I'm unable to use the Hyper-V based MultiPass. Multipass does allow a VirtualBox backend, however, it doesn't then bridge an interface, nor does it allow port forwarding.

Vagrantfile

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/bionic64"
  config.vm.network "public_network", 
    use_dhcp_assigned_default_route: true
  config.vm.provider "virtualbox" do |vb|
      vb.memory = 4096
      vb.cpus = 2
    end
  config.vm.provision "shell", inline: <<-EOF
    snap install microk8s --classic
    snap install docker
    microk8s.status --wait-ready
    microk8s.enable dns dashboard registry
    usermod -a -G microk8s vagrant
    echo "alias kubectl='microk8s.kubectl'" > /home/vagrant/.bash_aliases
    chown vagrant:vagrant /home/vagrant/.bash_aliases
    echo "alias kubectl='microk8s.kubectl'" > /root/.bash_aliases
    chown root:root /root/.bash_aliases
  EOF

  config.vm.define "microk8s_a" do |microk8s_a|
    microk8s_a.vm.hostname = "microk8s-a"
    microk8s_a.vm.provider "virtualbox" do |vb|
      vb.name = "microk8s-a"
    end
    microk8s_a.vm.provision "shell", inline: <<-EOF
      export local_ip="$(ip route | grep default | grep enp0s8 | cut -d' ' -f9)"
      microk8s.add-node | grep $local_ip | tee /vagrant/add_k8s
    EOF
  end
  config.vm.define "microk8s_b" do |microk8s_b|
    microk8s_b.vm.hostname = "microk8s-b"
    microk8s_b.vm.provider "virtualbox" do |vb|
      vb.name = "microk8s-b"
    end
    microk8s_b.vm.provision "shell", inline: <<-EOF
      bash -x /vagrant/add_k8s
    EOF
  end
end