Add master script

source: https://github.com/techiescamp/kubeadm-scripts/blob/main/scripts/master.sh

scripts/1-master.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+
+cat << "EOF"
+       _                          _   _             _                
+      (_)                        (_) | |           | |               
+       _    __ _    __ _   _ __   _  | |_        __| |   ___  __   __
+      | |  / _` |  / _` | | '__| | | | __|      / _` |  / _ \ \ \ / /
+      | | | (_| | | (_| | | |    | | | |_   _  | (_| | |  __/  \ V / 
+      | |  \__,_|  \__, | |_|    |_|  \__| (_)  \__,_|  \___|   \_/  
+     _/ |           __/ |                                            
+    |__/           |___/                                             
+                                                                      
+    Kubernetes Setup Script for Master Node
+    Script source: https://github.com/techiescamp
+EOF
+
+# If you need public access to API server using the servers Public IP adress, change PUBLIC_IP_ACCESS to true.
+
+PUBLIC_IP_ACCESS="true"
+NODENAME=$(hostname -s)
+POD_CIDR="192.168.0.0/16"
+
+# Pull required images
+
+sudo kubeadm config images pull
+
+# Initialize kubeadm based on PUBLIC_IP_ACCESS
+
+if [[ "$PUBLIC_IP_ACCESS" == "false" ]]; then
+    
+    MASTER_PRIVATE_IP=$(ip addr show eth0 | awk '/inet / {print $2}' | cut -d/ -f1)
+    sudo kubeadm init --apiserver-advertise-address="$MASTER_PRIVATE_IP" --apiserver-cert-extra-sans="$MASTER_PRIVATE_IP" --pod-network-cidr="$POD_CIDR" --node-name "$NODENAME" --ignore-preflight-errors Swap
+
+elif [[ "$PUBLIC_IP_ACCESS" == "true" ]]; then
+
+    MASTER_PUBLIC_IP=$(curl ifconfig.me && echo "")
+    sudo kubeadm init --control-plane-endpoint="$MASTER_PUBLIC_IP" --apiserver-cert-extra-sans="$MASTER_PUBLIC_IP" --pod-network-cidr="$POD_CIDR" --node-name "$NODENAME" --ignore-preflight-errors Swap
+
+else
+    echo "Error: MASTER_PUBLIC_IP has an invalid value: $PUBLIC_IP_ACCESS"
+    exit 1
+fi
+
+# Configure kubeconfig
+
+mkdir -p "$HOME"/.kube
+sudo cp -i /etc/kubernetes/admin.conf "$HOME"/.kube/config
+sudo chown "$(id -u)":"$(id -g)" "$HOME"/.kube/config
+
+# Install Claico Network Plugin Network 
+
+kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml