kubeadm-scripts/Installation Steps updated at main · manjumsgithub/kubeadm-scripts · GitHub

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K8S INSTALLATION

1)launch t2 medium ubuntu 22.04 version instance with 2core cpu 4gb ram  - For master node only - Give name as k8s-Master
2)launch ubuntu 22.04 version instance with t2 micro only - For worker node- Launch 2 worker nodes - Give name as Worker1 and Worker2
3)Open All Traffic in Master and worker nodes  **(go to security groups allow all traffic and allow alltrafficipv4 in both worker and master nodes)**
4)login as root user in all the three nodes : sudo -i  (or) sudo su
5)Run this command in all the three nodes

  1) git clone https://github.com/techiescamp/kubeadm-scripts
  2) cd kubeadm-scripts
  3) cd scripts
  4) Run the script in all the three nodes --- ./common.sh
  5) Run the script in only Master node -- ./master.sh
         Before running master file, edit the master file as join key script is missing in it. vi to master file, delete all content and paste the below content:
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#!/bin/bash
#
# Setup for Control Plane (Master) servers

set -euxo pipefail

# Configuration
PUBLIC_IP_ACCESS="false"
NODENAME=$(hostname -s)
POD_CIDR="192.168.0.0/16"

# Validate PUBLIC_IP_ACCESS
if [[ "$PUBLIC_IP_ACCESS" != "true" && "$PUBLIC_IP_ACCESS" != "false" ]]; then
    echo "Error: Invalid value for PUBLIC_IP_ACCESS: $PUBLIC_IP_ACCESS"
    exit 1
fi

# Disable swap
sudo swapoff -a
sudo sed -i '/swap/d' /etc/fstab

# Pull required images
sudo kubeadm config images pull

# Initialize kubeadm
if [[ "$PUBLIC_IP_ACCESS" == "false" ]]; then
    MASTER_PRIVATE_IP=$(ip route get 8.8.8.8 | awk '{print $7; exit}')
    sudo kubeadm init --apiserver-advertise-address="$MASTER_PRIVATE_IP" --apiserver-cert-extra-sans="$MASTER_PRIVATE_IP" --pod-network-cidr="$POD_CIDR" --node-name "$NODENAME" --ignore-preflight-errors Swap
else
    MASTER_PUBLIC_IP=$(curl -s ifconfig.me)
    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
fi

# Capture the join command
JOIN_COMMAND=$(kubeadm token create --print-join-command)
echo "$JOIN_COMMAND" > join-command.txt
echo "Use the following command to join worker nodes to the cluster:"
cat join-command.txt

# 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"

# Wait for the control plane to be ready
kubectl wait --for=condition=Ready node/"$NODENAME" --timeout=300s

# Install Calico Network Plugin
CALICO_VERSION="v3.26.0"
kubectl apply -f https://docs.projectcalico.org/$CALICO_VERSION/manifests/calico.yaml

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  6) copy the join key into your notepad
  7) Run this command in master node - kubectl get nodes
  8) paste the join key in two worker node
  9) Run this command in master node - kubectl get nodes  - and nodes should be in ready state

  10) Run this in two of the worker nodes to rename the nodes
      kubectl label node <node-name>  node-role.kubernetes.io/worker=worker for both worker nodes ( replace ip adrerss name by running kubectl get nodes command into <node-name> for both worker nodes )

   Run all these commands in master node

  11) Run This command to install network plugins
         kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

				To verify ---  kubectl get pods -n kube-system


  12) Run This command to install metrics server
    kubectl apply -f https://github.com/kubernetes-sigs/metrics-       			server/releases/latest/download/components.yaml

  13) Run this command to verify metrics are showing
			kubectl get pods -n kube-system

         kubectl top nodes

  14) Go into to this directory /kubeadm-scripts/manifests and run
         cd .
         cd /kubeadm-scripts/manifests
         kubectl apply -f sample-app.yaml  and wait for sometime and run below command
         kubectl get pods once pods are in run state access the master public ip address with <public-ip:32000>
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