cks-cluster

Install k8s cluster on ubuntu

• Install three ubuntu servers, one is master, the other two are workers
• Config /etc/hosts and /etc/hostname

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

sudo modprobe overlay
sudo modprobe br_netfilter

cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

• reload system config
  sudo sysctl --system
• Install containerd
  sudo apt-get update && sudo apt-get -y install containerd
• Create a directory and configure containerd

sudo mkdir -p /etc/containerd
sudo containerd config default | sudo tee /etc/containerd/config.toml
sudo systemctl restart containerd

sudo swapoff -a
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 -

• Config repository
  echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
• Update apt package index, install kubelet, kubeadm and kubectl, and make sure not auto update

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

sudo kubeadm init --pod-network-cidr 192.168.0.0/16 --kubernetes-version 1.26.2

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

• Install network plugin Calico
  https://docs.tigera.io/calico/3.25/getting-started/kubernetes/self-managed-onprem/onpremises

• Join worker node, then apply the output to other worker nodes
  kubeadm token create --print-join-command

• In master node, kubectl get nodes

error:

1. Install docker, https://docs.docker.com/engine/install/ubuntu/
   fix the error: https://forum.linuxfoundation.org/discussion/862825/kubeadm-init-error-cri-v1-runtime-api-is-not-implemented