Init script for kubernetes...

initscript.sh

#!/bin/bash
export DEBIAN_FRONTEND=noninteractive

# Pre-phase.
apt update
apt upgrade -y
apt install -y ufw apt-transport-https ca-certificates curl software-properties-common grep

# Apt keys and deb lists.
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
apt-key fingerprint 0EBFCD88

add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

# Install all!
apt-get update
apt-get install -y docker-ce docker-ce-cli containerd.io kubelet kubeadm
apt-mark hold kubelet kubeadm kubectl

# Ufw settings.
ufw allow ssh
ufw allow 6443/tcp
ufw allow 2379:2380/tcp
ufw allow http
ufw allow https
ufw allow 10250:10252/tcp
ufw --force enable

# Kube hates swap!
swapoff -a
reboot