Kube Install

#! /usr/bin/env bash

if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi
echo "Installing packages: apt-transport-https ca-certificates curl software-properties-common"

apt-get update -qq && apt-get install -qq -y apt-transport-https ca-certificates curl software-properties-common

echo "Adding kubernetes repository"

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - &> /dev/null
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update -qq

echo "Checking version"

VERSIONS=($(apt-cache show kubelet|grep -i version|sed 's/ //g'|cut -d':' -f 2))

VERSION=$1
if [[ ! " ${VERSIONS[*]} " =~ ${VERSION} ]]; then
        echo "Invalid version: $VERSION. Available Versions:"
        printf "%s\n"  "${VERSIONS[@]}"
        exit 1
fi
echo "Using Version: $VERSION"

update-alternatives --set iptables /usr/sbin/iptables-legacy &> /dev/null
update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy &> /dev/null
update-alternatives --set arptables /usr/sbin/arptables-legacy &> /dev/null
update-alternatives --set ebtables /usr/sbin/ebtables-legacy &> /dev/null

echo "Pre Configuring Containerd"
cat > /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF

modprobe overlay
modprobe br_netfilter

# Setup required sysctl params, these persist across reboots.
cat > /etc/sysctl.d/99-kubernetes-cri.conf <<EOF
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

sysctl --system

# Install containerd
echo "Installing Containerd"
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key --keyring /etc/apt/trusted.gpg.d/docker.gpg add -
add-apt-repository \
    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
    $(lsb_release -cs) \
    stable"
apt-get update -qq && apt-get install -y containerd.io -qq

echo "Configuring Containerd"

# Configure containerd
mkdir -p /etc/containerd
containerd config default > /etc/containerd/config.toml

# Restart containerd
systemctl restart containerd

echo "Installing Kubernetes packages: kubelet kubeadm kubectl"
apt-get install -qq -y kubelet=$VERSION kubeadm=$VERSION kubectl=$VERSION
apt-mark hold kubelet kubeadm kubectl

echo "Disabling swap"
# Disable swap
swapoff -a
sed -i 's/\/swap/# \/swap/g' /etc/fstab

systemctl daemon-reload
systemctl restart kubelet

echo "Create resolv.conf symlink"
sudo rm /etc/resolv.conf
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
echo "Done"