#!/bin/bash
 
#author:  tmade
#version: 1.1
 
#kubernetes user name
USER="kubernetes"
HOME="/home/${USER}"
KUBEHOME="${HOME}/.kube"
#CIDR="10.0.0.5"
PODNETWORKADDON="192.168.0.0/16"
 
read -p "Do you want to create the user ${USER}? Please enter \"y\" or \"n\: " MYUSER
echo ""
if  [ ${MYUSER,,} == "y" ]
then 
  useradd -s /bin/bash -m ${USER}
fi
sudo -lU ${USER} > /dev/null 2>&1
RESULT=$?
if [ "${RESULT}" -ne "0" ] ;
then
  echo "User "${USER}" does not exist in sudoers and will be added."
  echo "${USER} ALL=(ALL:ALL) NOPASSWD: ALL" >> /etc/sudoers
else
  echo "User "${USER}" already exists in sudoers - won´t be added again!"
fi
 
echo ""
echo "Setup -------------k8s--------------"
echo ""
su - ${USER} -c "kubectl version 2> /dev/null"
echo ""
su - ${USER} -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. \"1.23.3-00\"): " VERSION
echo "Version: \"$VERSION\" will be installed!"
apt-mark unhold kubernetes-cni kubeadm kubelet kubectl docker-ce
apt-get install -y kubeadm=${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}
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
echo "Creating folder structure..."
echo ""
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 . . ."
echo ""
echo "Creating calico pod network addon..."
echo ""
su - ${USER} -c "kubectl create -f https://projectcalico.docs.tigera.io/manifests/tigera-operator.yaml"
su - ${USER} -c "kubectl create -f https://projectcalico.docs.tigera.io/manifests/custom-resources.yaml"
echo ""
echo "calico pod network add on has been deployed"
echo ""
read -s -n 1 -p "Press any key to continue . . ."
#install dashboard
su - ${USER} -c "kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.5.0/aio/deploy/recommended.yaml"
echo ""
echo "dashboard 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 nodes $(hostname) node-role.kubernetes.io/master-
fi
 
echo ""
echo "Status - please press \"ctrl + c\" when all pods are running"
echo ""
 
watch kubectl get pods -A -o wide