ubuntu-all-nodes.sh

#!/bin/bash

# Install Docker CE
# Update the apt package index
echo "Installing Docker"
sudo apt update

## Install packages to allow apt to use a repository over HTTPS
sudo apt install ca-certificates software-properties-common apt-transport-https curl -y

## Add Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

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

# Install docker ce (latest supported for K8s 1.14 is Docker 18.09)
sudo apt update && sudo apt install docker-ce=5:18.09.6~3-0~ubuntu-bionic -y

# Setup daemon parameters, like log rotation and cgroups
sudo tee /etc/docker/daemon.json >/dev/null <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

sudo mkdir -p /etc/systemd/system/docker.service.d

# Restart docker.
sudo systemctl daemon-reload
sudo systemctl restart docker
echo "Docker installed"

echo "Installing the K8s components"

# Add the K8s repo to apt
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list >/dev/null

# Install kubelet, kubectl and kubeadm for cluster spinup
sudo apt update
sudo apt install kubelet kubeadm kubectl -y

# Hold K8s packages at their installed version so as not to upgrade unexpectedly on an apt upgrade
sudo apt-mark hold kubelet kubeadm kubectl
echo "K8s components installed"

echo "Changing iptables for flannel"
sudo sysctl net.bridge.bridge-nf-call-iptables=1