kubernetes ubuntu 20.04 install

sudo apt -y install docker.io apt-transport-https curl
sudo -s
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

exit

sudo systemctl restart docker
sudo systemctl enable docker

sudo vi /etc/sysctl.conf
net.ipv4.ip_forward = 1 #주석처리
:wq

sudo sysctl --system

sudo swapoff -a
sudo vi /etc/fstab
#swap 주석


sudo apt-get update && sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

#master
sudo kubeadm init --apiserver-advertise-address=172.16.135.70 --pod-network-cidr=10.244.0.0/16

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

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml


#node
sudo kubeadm join 172.16.135.70:6443 --token flt54u.bzx2js9sjdijbnje \
    --discovery-token-ca-cert-hash sha256:71f1aed9c7f742f1901d29f0d1126dcca72af0eb595f7739be52d0680e332827