install-kubernetes-dependencies.sh

#!/bin/bash -e


install_required_packages ()
{
sudo apt update
sudo apt -y install curl apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt update
sudo apt -y install vim git curl wget kubelet=1.24.12-00 kubeadm=1.24.12-00 kubectl=1.24.12-00
sudo apt-mark hold kubelet kubeadm kubectl
}

configure_hosts_file ()
{
sudo tee /etc/hosts<<EOF
172.16.8.10 master
172.16.8.11 node-01
EOF
}

disable_swap () 
{
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo swapoff -a
}

configure_sysctl ()
{
sudo modprobe overlay
sudo modprobe br_netfilter
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
sudo sysctl --system
}

install_docker_runtime () 
{
sudo apt update
sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt update
sudo apt install -y containerd.io docker-ce docker-ce-cli
sudo mkdir -p /etc/systemd/system/docker.service.d
sudo tee /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

sudo systemctl daemon-reload 
sudo systemctl restart docker
sudo systemctl enable docker

sed -i 's/plugins.cri.systemd_cgroup = false/plugins.cri.systemd_cgroup = true/' /etc/containerd/config.toml
}

install_cri_dockerd () 
{
cd /tmp
export VER="0.3.1"
wget -q https://github.com/Mirantis/cri-dockerd/releases/download/v${VER}/cri-dockerd-${VER}.amd64.tgz
tar xvf cri-dockerd-${VER}.amd64.tgz

sudo mv cri-dockerd/cri-dockerd /usr/bin/

wget https://raw.githubusercontent.com/Mirantis/cri-dockerd/master/packaging/systemd/cri-docker.service
wget https://raw.githubusercontent.com/Mirantis/cri-dockerd/master/packaging/systemd/cri-docker.socket
sudo mv cri-docker.socket cri-docker.service /etc/systemd/system/

sudo systemctl daemon-reload
sudo systemctl enable cri-docker.service
sudo systemctl enable --now cri-docker.socket

cri-dockerd --version
}


install_required_packages
configure_hosts_file
disable_swap
configure_sysctl
install_docker_runtime
install_cri_dockerd