Vagrant file for setting up a single-node Kubernetes cluster that I can access from my desktop. Read more: https://medium.com/@lizrice/kubernetes-in-vagrant-with-kubeadm-21979ded6c63

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

# This script to install Kubernetes will get executed after we have provisioned the box 
$script = <<-SCRIPT

# Install docker (we do this rather than use the vagrant provisioner so we can fetch a specific version)
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-cache policy docker-ce
sudo apt-get install docker-ce=18.06.0~ce-0~ubuntu

# Install kubernetes
apt-get update && apt-get install -y apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl

# kubelet requires swap off
swapoff -a
# keep swap off after reboot
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

sudo sed -i '0,/ExecStart=/s//Environment="KUBELET_EXTRA_ARGS=--cgroup-driver=cgroupfs"\n&/' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

# Get the IP address that VirtualBox has given this VM
IPADDR=`ifconfig eth1 | grep inet | awk '{print $2}'| cut -f2 -d:`
echo This VM has IP address $IPADDR

# Set up Kubernetes
NODENAME=$(hostname -s)
echo This VM has IP node name $NODENAME
kubeadm init --apiserver-cert-extra-sans=$IPADDR  --node-name $NODENAME

# Set up admin creds for the vagrant user
echo Copying credentials to /home/vagrant...
sudo --user=vagrant mkdir -p /home/vagrant/.kube
cp -i /etc/kubernetes/admin.conf /home/vagrant/.kube/config
chown $(id -u vagrant):$(id -g vagrant) /home/vagrant/.kube/config
SCRIPT

Vagrant.configure("2") do |config|
  # Specify your hostname if you like
  config.vm.hostname = "apiserver"
  config.vm.box = "bento/ubuntu-18.04"
  config.vm.network "private_network", type: "dhcp"
  #config.vm.provision "docker"
  config.vm.provision "shell", inline: $script
end