installKubeSlave.sh

#!/bin/bash

############### Enable iptables Brifged Trafic an all nodes 
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

# Apply sysctl params without reboot
sudo sysctl --system


###############
############### Disable swap on all the Nodes
sudo swapoff -a
(crontab -l 2>/dev/null; echo "@reboot /sbin/swapoff -a") | crontab - || true


################################### INSTALL DOCKER ############################

## Add repository : 
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] 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-get update

sudo systemctl start docker
sudo systemctl enable docker
sudo systemctl status docker


############################### INSTALL KUBERNATES ###############################333

# Install dependency packages:
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl


### Download and add GPG key:
sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://dl.k8s.io/apt/doc/apt-key.gpg

### Add the Kubernetes APT repository to your system.
echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

# Update package listings:
sudo apt-get update -y

### You can use the following commands to find the latest versions.
sudo apt update
apt-cache madison kubeadm | tac

# Install Kubernetes packages. Note: use the following command "sudo kill -9 $( sudo lsof /var/lib/dpkg/lock-frontend | awk '{ print $2 }' | tail -1 )" if you receive a "E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?" message.
sudo apt-get install -y kubelet=1.24.0-00 kubeadm=1.24.0-00 kubectl=1.24.0-00

# Turn off automatic updates:
sudo apt-mark hold kubelet kubeadm kubectl

## verification 
kubeadm version 

### Add the node IP to KUBELET_EXTRA_ARGS.
sudo apt-get install -y jq
local_ip="$(ip --json a s | jq -r '.[] | if .ifname == "eth1" then .addr_info[] | if .family == "inet" then .local else empty end else empty end')"
cat > /etc/default/kubelet << EOF
KUBELET_EXTRA_ARGS=--node-ip=$local_ip
EOF