cloud-init script to boostrap Kubernetes in a single VM

kube.sh

#!/bin/sh
set -e -x

apt-get --yes --quiet update
apt-get --yes --quiet install apt-transport-https ca-certificates curl software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

apt-get update

apt-get --yes --quiet install docker-ce

usermod -aG docker ubuntu 

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 --yes kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubectl

kubeadm init

# for the ubuntu user
mkdir -p /home/ubuntu/.kube
cp -i /etc/kubernetes/admin.conf /home/ubuntu/.kube/config
chown 1000:1000 /home/ubuntu/.kube/config

# for the root user
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

kubectl taint nodes --all node-role.kubernetes.io/master-

sysctl net.bridge.bridge-nf-call-iptables=1
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"