init.sh

#!/bin/bash

# Update the system
yum update -y

# Install Docker
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y docker-ce docker-ce-cli containerd.io
systemctl start docker
systemctl enable docker

# Disable SELinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

# Add Kubernetes repository
cat <<EOF | tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://prod-cdn.packages.k8s.io/repositories/isv:/kubernetes:/core:/stable:/v1.29/rpm/repodata/repomd.xml
EOF

# Install Kubernetes components
yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
systemctl enable --now kubelet

# Initialize Kubernetes cluster
kubeadm init --pod-network-cidr=10.244.0.0/16

# Configure kubectl for root user
mkdir -p /root/.kube
cp /etc/kubernetes/admin.conf /root/.kube/config

# Install Calico network plugin
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml