Library for Kubeadm Install

multi-k8s-install.lib

#!/bin/bash
# BASH Library File

# Define Functions
sethostname () {
    # Set hostname if it not set
    if [ $ISHOSTSET == 'n' ]; then
    read -p "Enter the hostname to set: " HOST
    sudo hostnamectl set-hostname ${HOST}
    sudo sed -i "s/127.0.0.1 localhost/127.0.0.1 localhost ${HOST}/" /etc/hosts
    sudo reboot
    fi
}

needrestart () {
    # Restart services automatically instead of prompting the user
    if [ "$UBUNTU_CODENAME" == "jammy" ]; then
    echo setting NEEDRESTART to auto...
    sudo sed -i "s/#\$nrconf{restart} = 'i';/\$nrconf{restart} = 'a';/" /etc/needrestart/needrestart.conf
    fi
}

disableswap () {
    # Disable Swap if it exists
    if [ ! -z $(swapon -s) ]; then
    echo Disable Swap Memory...
    sudo swapoff -a &> /dev/null
    sudo sed -i '/swap/d' /etc/fstab
    fi
}

updatepodsubnet () {
    if [ ${IS_MASTER} == 'y' ]; then
        POD_SUBNET="172.16.0.0/16"
        read -p "The Pod CIDR is ${POD_SUBNET}. Press Enter to continue or c to change: " CHANGE
        if [ ! -z $CHANGE ]; then
            read -p "Enter the Pod CIDR to use with kubeadm: " POD_SUBNET
        fi
    fi
}

kernelparamsetup () {
echo Forwarding IPv4 and letting iptables see bridged traffic...
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

sudo modprobe overlay
sudo modprobe br_netfilter

# sysctl params required by setup, params persist across reboots
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF
}

installcontainerd () {
    # Install containerd
    echo Installing dependencies...
    sudo apt update
    sudo apt install -y ca-certificates curl gnupg bash-completion
    sudo install -m 0755 -d /etc/apt/keyrings
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
    sudo chmod a+r /etc/apt/keyrings/docker.gpg

    echo Adding the Docker repository...
    echo \
    "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
    "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
    sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
    sudo apt update

    echo Installing containerd...
    sudo apt install -y containerd.io

    # Configuring containerd for Kubernetes...
    echo Configuring containerd for Kubernetes...
    sudo su -c 'containerd config default > /etc/containerd/config.toml'
    sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
    sudo systemctl restart containerd
}

installk8s-128 () {
    curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/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:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
    sudo apt update
    sudo apt install -y kubelet kubeadm kubectl
    sudo apt-mark hold kubelet kubeadm kubectl
}

installk8s-127 () {
    curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.27/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg    # This overwrites any existing configuration in /etc/apt/sources.list.d/kubernetes.list
    echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.27/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list    sudo apt update
    sudo apt update
    sudo apt install -y kubelet kubeadm kubectl
    sudo apt-mark hold kubelet kubeadm kubectl
}

installk8s-126 () {
    curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.26/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:/v1.26/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
    sudo apt update
    sudo apt install -y kubelet kubeadm kubectl
    sudo apt-mark hold kubelet kubeadm kubectl
}