#!/bin/bash
 
#author:  tmade
#version: 1.5

RELEASE=$(lsb_release -cs)

echo "Install requirements"

apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

echo ""
echo "check if docker is already installed..."
dpkg -l |grep docker-ce
DOCKERINSTALL=$(echo $?)
echo ""
 
if [ ${DOCKERINSTALL} -eq "0" ]
then
        echo "docker already installed"
else
        echo "docker isn´t installed yet - installing..."
        curl -sSL https://get.docker.com | sh
fi
 
echo ""
echo "check k8s installation:"
dpkg -l |grep kube*
KUBEINSTALL=$(echo $?)
echo ""
 
if [ ${KUBEINSTALL} -eq "0" ]
then
        echo "k8s already installed"
else
        echo "Installing k8s repository..."
        curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
	#echo "deb http://apt.kubernetes.io/ kubernetes-${RELEASE} main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
        echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
fi
 
echo ""
echo "Setup cgroupdriver as systemd"
echo ""
 
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF
 
# Restart docker.
 
mkdir -p /etc/systemd/system/docker.service.d
systemctl daemon-reload
systemctl restart docker
 
apt-get update
apt-mark unhold kubernetes-cni kubeadm kubelet kubectl docker-ce docker-ce-cli
echo ""
echo "Up- or downgrade docker and k8s packages"
echo ""
 
apt-cache policy docker-ce  | head -n 30
echo ""
read -p "Please enter the docker version you want to install (e. g. \"5:19.03.6~3-0~ubuntu-xenial\"): " DVERSION
echo "Version: \"${DVERSION}\" will be installed!"
echo ""
apt-get install -y docker-ce=${DVERSION} docker-ce-cli=${DVERSION} --allow-downgrades
echo ""
apt-cache policy kubeadm  | head -n 30
echo ""
read -p "Please enter the k8s version you want to install (e. g. \"1.16.4-00\"): " VERSION
echo "Version: \"${VERSION}\" will be installed!"
echo ""
apt-get install -y kubeadm=${VERSION} kubelet=${VERSION} kubectl=${VERSION} --allow-downgrades
echo ""
apt-mark hold kubelet kubeadm kubectl docker-ce docker-ce-cli
echo ""
echo "k8s packages are installed!"
echo ""