2022/zh_tw/Days/Kubernetes/scripts/master.sh
#! /bin/bash

MASTER_IP="10.0.0.10"
NODENAME=$(hostname -s)
POD_CIDR="192.168.0.0/16"

sudo kubeadm config images pull

echo "Preflight Check Passed: Downloaded All Required Images"


sudo kubeadm init --apiserver-advertise-address=$MASTER_IP  --apiserver-cert-extra-sans=$MASTER_IP --pod-network-cidr=$POD_CIDR --node-name $NODENAME --ignore-preflight-errors Swap

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

# Save Configs to shared /Vagrant location
# For Vagrant re-runs, check if there is existing configs in the location and delete it for saving new configuration.
config_path="/vagrant/configs"

if [ -d $config_path ]; then
   rm -f $config_path/*
else
   mkdir -p /vagrant/configs
fi

cp -i /etc/kubernetes/admin.conf /vagrant/configs/config
touch /vagrant/configs/join.sh
chmod +x /vagrant/configs/join.sh       

# Generete kubeadm join command
kubeadm token create --print-join-command > /vagrant/configs/join.sh

# Install Calico Network Plugin
curl https://docs.projectcalico.org/manifests/calico.yaml -O

kubectl apply -f calico.yaml

# Install Metrics Server
kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
kubectl patch deployment metrics-server -n kube-system --type 'json' -p '[{"op": "add", "path": "/spec/template/spec/containers/0/args/-", "value": "--kubelet-insecure-tls"}]'

# Install Kubernetes Dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.4.0/aio/deploy/recommended.yaml

# Create Dashboard User
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
EOF

cat <<EOF | kubectl apply -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
EOF

kubectl -n kubernetes-dashboard get secret $(kubectl -n kubernetes-dashboard get sa/admin-user -o jsonpath="{.secrets[0].name}") -o go-template="{{.data.token | base64decode}}" >> /vagrant/configs/token

sudo -i -u vagrant bash << EOF
mkdir -p /home/vagrant/.kube
sudo cp -i /vagrant/configs/config /home/vagrant/.kube/
sudo chown 1000:1000 /home/vagrant/.kube/config
EOF

sudo systemctl restart systemd-resolved
sudo swapoff -a && sudo systemctl daemon-reload && sudo systemctl restart kubelet



