#!/bin/bash

#author:  tmade
#version: 1.0

RELEASE=$(lsb_release -cs)

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 ""

apt-get update
apt-mark unhold kubernetes-cni kubeadm kubelet kubectl
echo ""
echo "Up- or downgrade k8s packages"
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
echo ""
echo "k8s packages are installed!"
echo ""