cluster.sh

#!/bin/bash

apt-get install -y curl openssh-server vim 
sudo sed -i '/^#PermitRootLogin prohibit-password/a PermitRootLogin yes' /etc/ssh/sshd_config
sudo sed -i 's/^#ClientAliveInterval 0/ClientAliveInterval 20/' /etc/ssh/sshd_config
sudo sed -i 's/^#ClientAliveCountMax 3/ClientAliveCountMax 30/' /etc/ssh/sshd_config
systemctl restart ssh
systemctl disable --now ufw

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

modprobe overlay
modprobe br_netfilter

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

sysctl --system

mkdir -m 0755 -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

apt-get update && apt-get install -y containerd.io

mkdir -p /etc/containerd
containerd config default>/etc/containerd/config.toml
sed -e 's/SystemdCgroup = false/SystemdCgroup = true/g' -i /etc/containerd/config.toml

systemctl daemon-reload
systemctl restart containerd
systemctl enable containerd

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

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.31/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.31/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list

apt-get update && apt-get install -y kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubectl
systemctl enable kubelet