#!/bin/bash
# curl https://gist.github.com/jeremyje/14e26148909734ebe1d6395cc8b0e156/raw/master.sh | bash

function WaitForKubectl {
n=0
until [ $n -ge 5 ]
do
   command && kubectl get nodes
   n=$[$n+1]
   sleep 5
done
}

function InstallWeaveNet {
  echo "Install WeaveNet"

  sudo sysctl net.bridge.bridge-nf-call-iptables=1
  #sudo kubeadm init --pod-network-cidr=10.244.0.0/16
  sudo kubeadm init --pod-network-cidr=192.168.86.0/24
  
  echo "Waiting for network (10s)..."
  WaitForKubectl

  # https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#pod-network
  kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
}

function InstallFlannel {
  echo "Install Flannel"

  sudo sysctl net.bridge.bridge-nf-call-iptables=1
  sudo kubeadm init --pod-network-cidr=10.244.0.0/16
  
  echo "Waiting for network (10s)..."
  WaitForKubectl

  # https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#pod-network
  #kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml
  #kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/4ff77dc7c35851913587f7daccf25d754e77aa65/Documentation/kube-flannel.yml
  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
  #echo "Opening UDP ports for Flannel Network Fabric"
  sudo iptables -A INPUT -p udp --dport 8285 -j ACCEPT
  sudo iptables -A INPUT -p udp --dport 8472 -j ACCEPT
}

function InstallPostFlannel {
  #kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml
  #kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/4ff77dc7c35851913587f7daccf25d754e77aa65/Documentation/kube-flannel.yml
  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
}

function InstallCalico {
  echo "Install Calico Network Fabric"
  kubectl apply -f https://docs.projectcalico.org/v3.14/manifests/calico.yaml
  sudo kubeadm init --pod-network-cidr=192.168.86.0/24
}

function InstallKubeRouter {
  echo "Install KubeRouter Fabric"
  sudo kubeadm init --pod-network-cidr=192.168.86.0/24
}

function Prereq {
   sudo swapoff -a
   cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
  sudo sysctl --system
}

Prereq
InstallFlannel
#InstallWeaveNet
#InstallKubeRouter
#InstallCalico

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

InstallPostFlannel

echo "Run on all kubelets"
kubeadm token create --print-join-command
echo "Enable Pods on Master"
echo "kubectl taint nodes --all node-role.kubernetes.io/master-"