Install Kubernetes (1.25) on Linux Ubuntu in EC2

참고자료: 따배쿠 (따라하면서 배우는 쿠버네티스 이성미 강사님 자료)

[환경]
Master Node : 1개
Worker Node : 2개
Ubuntu 18.04 (중요) --> Kubernetes 1.25와 Ubuntu 20.04 이상은 호환성 문제가 있음.
방화벽
Inbound: 443, 80, 6443, 22 open

[전체적인 설치 프로세스]
1. Doker Install (모든 node에 필요)
2. K8s Install
- 설치전 환경 설정
- kubeadm, kubectl, kubelet 설치
- control-plane 구성
- worker node 구성
- 설치 확인

 

 

1. Master Node

    1  sudo swapoff -a
    2  sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
    3  sudo tee /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF

    4  sudo modprobe overlay
    5  sudo modprobe br_netfilter
    6  sudo tee /etc/sysctl.d/kubernetes.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

    7  sudo sysctl --system
    8  sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates
    9  sudo apt-get update
   10  sudo apt-get install -y ca-certificates curl gnupg lsb-release
   11  sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates
   12  sudo mkdir -p /etc/apt/keyrings
   13  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
   14  echo   "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
   15  sudo apt-get update
   16  sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
   17  sudo systemctl restart containerd
   18  sudo systemctl enable containerd
   19  sudo systemctl enable docker
   20  sudo systemctl start docker
   21  sudo docker version
   
   # 여기까지 Docker 설치 및 확인
   
   22  sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
   23  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
   24  sudo apt-get update
   25  sudo apt-get install -y apt-transport-https ca-certificates curl
   26  sudo apt update
   27  sudo apt install -y kubelet kubeadm kubectl
   28  sudo apt-mark hold kubelet kubeadm kubectl
   29  sudo ls -altr /etc/containerd/config.toml 
   30  sudo kubeadm init
   31  sudo rm /etc/containerd/config.toml
   32  sudo systemctl restart containerd
   33  sudo kubeadm init
   34  mkdir -p $HOME/.kube
   35  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
   36  sudo chown $(id -u):$(id -g) $HOME/.kube/config
   37  kubectl get nodes
   38  kubectl get pods -n kube-system
   39  curl https://projectcalico.docs.tigera.io/manifests/calico.yaml -O
   40  kubectl apply -f calico.yaml
   41  kubectl get pods -n kube-system

Docker version 확인하여 설치 확인

 

위 30번 명령에서 kubeadm init 수행

sudo kubeadm init

아래와 같이 에러 발생

에러 해결 방법 (31~33 명령)

sudo rm /etc/containerd/config.toml
sudo systemctl restart containerd
sudo kubeadm init

 

Worker Node

sudo apt-get update
   sudo apt-get install -y ca-certificates curl gnupg lsb-release
   sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates
   sudo mkdir -p /etc/apt/keyrings
   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
   echo   "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
   sudo apt-get update
   sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
   
   ## 여기까지 docker 설치
   
   10  sudo swapoff -a
   11  sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
   12  sudo tee /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF

   13  sudo modprobe overlay
   14  sudo modprobe br_netfilter
   15  sudo tee /etc/sysctl.d/kubernetes.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

   16  history
   17  sudo systemctl restart containerd
   18  sudo systemctl enable containerd
   19  sudo systemctl enable docker
   20  sudo systemctl start docker
   21  sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
   22  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
   23  sudo apt-get update
   24  sudo apt-get install -y apt-transport-https ca-certificates curl
   25  sudo apt update
   26  sudo apt install -y kubelet kubeadm kubectl
   27  sudo apt-mark hold kubelet kubeadm kubectl
   28  sudo kubeadm join xxx:6443 --token xevxt7.xxx --discovery-token-ca-cert-hash sha256:xxx
   29  sudo rm /etc/containerd/config.toml
   30  sudo systemctl restart containerd
   31  sudo kubeadm join xxx:6443 --token xevxt7.xxx --discovery-token-ca-cert-hash sha256:xxx

Worker node가 cluster에 조인

여러번 수행한 것이라 잘 될 것입니다.