#!/bin/bash

#author:  Thomas Roehm
#version: 1.0

USER="kubernetes"
HOME="/home/${USER}"
KUBEHOME="${HOME}/.kube"
#CIDR="10.0.0.5"
PODNETWORKADDON="192.168.0.0/16"

echo ""
echo "Setup -------------k8s--------------"
echo ""
su - kubernetes -c "kubectl version 2> /dev/null"
echo ""
su - kubernetes -c "read -s -n 1 -p \"Press any key to continue . . .\""

apt-get update
apt-cache policy kubeadm  | head -n 30
#apt-cache policy docker-ce

echo ""
read -p "Please enter k8s version you want to install (e. g. \"1.16.4-00\"): " VERSION
echo "Version: \"$VERSION\" will be installed!"
apt-mark unhold kubernetes-cni kubeadm kubelet kubectl docker-ce
#apt-mark unhold kubernetes-cni kubeadm kubelet kubectl docker-ce
apt-get install -y kubeadm=${VERSION} kubelet=${VERSION} kubectl=${VERSION}
echo ""
read -p "Please enter your CIDR management ip-adress for your master (e. g. \"10.6.33.10\"): " CIDR
echo ""
echo "ip set to: \"$CIDR\""
echo ""
kubeadm init --apiserver-advertise-address=${CIDR} --pod-network-cidr=${PODNETWORKADDON} --cri-socket=unix:///var/run/crio/crio.sock
echo ""
read -s -n 1 -p "Press any key to continue . . ."
echo ""
if  [ -e ${KUBEHOME} ]
then
        echo "\"${KUBEHOME}\" exists"
        read -p "Do you want to delete \"${KUBEHOME}\"? Please enter y (proceed) or n (stop): " PROCEED
        echo "You´ve entered:  \"$PROCEED\""
        echo ""
        if [ $PROCEED = y ]
        then
                rm -r ${KUBEHOME}
                echo "\"${KUBEHOME}\" deleted!"
                echo ""
                read -s -n 1 -p "Press any key to continue . . ."
        else
        exit 1
        fi
fi
su - ${USER} -c "mkdir -p $HOME/.kube"
su - ${USER} -c "sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config"
chown -R ${USER}:${USER} $HOME/.kube
echo ""
echo "home \"$HOME/.kube\" copied!"
echo ""
read -s -n 1 -p "Press any key to continue . . ."

#calico pod-network-addon
kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.24.3/manifests/tigera-operator.yaml
kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.24.3/manifests/custom-resources.yaml
echo "calico pod network add on has been deployed"
echo ""
read -s -n 1 -p "Press any key to continue . . ."

apt-mark hold kubernetes-cni kubeadm kubelet kubectl docker-ce

echo ""
while [ -z $SCHEDULE ] ;
do
      read -p "Do you want to schedule pods on your master? Please enter \"y\" or \"n\": " SCHEDULE
      echo "Please enter \"y\" or \"n\""
done

echo ""
echo "You´ve entered:  \"$SCHEDULE\""
echo ""

if [ $SCHEDULE = y ]
then
                kubectl taint node $(hostname) node-role.kubernetes.io/control-plane:NoSchedule
fi

echo ""
echo "Status - please press \"ctrl + c\" when all pods are running"
echo ""

watch kubectl get pods -A -o wide