Cluster Installation using kubeadm

https://kubernetes.io/ko/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

kubeadm 설치하기

Follow the steps in the official documentation.

These steps have to be performed on both nodes.

• set net.bridge.bridge-nf-call-iptables to 1:

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

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

The docker runtime has already been installed on both nodes, so you may skip this step.

• Install kubeadm, kubectl and kubelet on all nodes:

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl

sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg

echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt-get update
sudo apt-get install -y kubelet=1.21.0-00 kubeadm=1.21.0-00 kubectl=1.21.0-00
sudo apt-mark hold kubelet kubeadm kubectl

• 아래의 명령어를 입력한 후 IP 주소 확인. inet 부분

ifconfig eth0​

• control plane에서 아래의 명령어로 kubernetes cluster 생성

kubeadm init \
--apiserver-cert-extra-sans=controlplane \
--apiserver-advertise-address 10.29.249.12 \
--pod-network-cidr=10.244.0.0/16

• 위의 명령어를 따라서 kubeconfig 셋업

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

• worker node에서 출력된 kubeadm join 명령어 입력

• 아래의 명령어를 입력하여 Network Plugin인 Flannel 설치

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