How to setup Automated PXE Server Setup Script

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#!/bin/bash

# ============================================================
# Automated PXE Server Setup
# Supported OS : RHEL / Rocky / AlmaLinux 8 & 9
# Author       : ChatGPT
# ============================================================

set -e

# -----------------------------
# Variables
# -----------------------------

PXE_SERVER_IP="192.168.1.10"
SUBNET="192.168.1.0"
NETMASK="255.255.255.0"
RANGE_START="192.168.1.100"
RANGE_END="192.168.1.200"
GATEWAY="192.168.1.1"

OS_NAME="rhel9"
ISO_MOUNT="/mnt/rhel9"
HTTP_ROOT="/var/www/html/${OS_NAME}"

TFTP_ROOT="/var/lib/tftpboot"
PXE_CFG="${TFTP_ROOT}/pxelinux.cfg"

# -----------------------------
# Install Required Packages
# -----------------------------

echo "Installing required packages..."

dnf install -y \
dhcp-server \
tftp-server \
syslinux \
httpd \
xinetd \
wget \
firewalld

# -----------------------------
# Enable Services
# -----------------------------

systemctl enable --now firewalld
systemctl enable --now httpd
systemctl enable --now tftp.socket
systemctl enable --now dhcpd

# -----------------------------
# Configure Firewall
# -----------------------------

echo "Configuring firewall..."

firewall-cmd --permanent --add-service=http
firewall-cmd --permanent --add-service=dhcp
firewall-cmd --permanent --add-service=tftp
firewall-cmd --reload

# -----------------------------
# Create TFTP Structure
# -----------------------------

echo "Creating PXE boot directories..."

mkdir -p ${PXE_CFG}
mkdir -p ${TFTP_ROOT}/images/${OS_NAME}

# -----------------------------
# Copy PXE Boot Files
# -----------------------------

echo "Copying PXE boot files..."

cp /usr/share/syslinux/pxelinux.0 ${TFTP_ROOT}/
cp /usr/share/syslinux/menu.c32 ${TFTP_ROOT}/
cp /usr/share/syslinux/libutil.c32 ${TFTP_ROOT}/
cp /usr/share/syslinux/libcom32.c32 ${TFTP_ROOT}/

# -----------------------------
# Mount ISO
# -----------------------------

echo "Mounting ISO..."

mkdir -p ${ISO_MOUNT}

echo "Please place RHEL ISO at /root/rhel9.iso"

mount -o loop /root/rhel9.iso ${ISO_MOUNT}

# -----------------------------
# Copy Installation Files
# -----------------------------

echo "Copying installation files..."

mkdir -p ${HTTP_ROOT}

cp -r ${ISO_MOUNT}/* ${HTTP_ROOT}/

# -----------------------------
# Copy Kernel and Initrd
# -----------------------------

echo "Copying kernel and initrd..."

cp ${ISO_MOUNT}/images/pxeboot/vmlinuz \
${TFTP_ROOT}/images/${OS_NAME}/

cp ${ISO_MOUNT}/images/pxeboot/initrd.img \
${TFTP_ROOT}/images/${OS_NAME}/

# -----------------------------
# Create PXE Menu
# -----------------------------

echo "Creating PXE menu..."

cat <<EOF > ${PXE_CFG}/default

DEFAULT menu.c32
PROMPT 0
TIMEOUT 100
ONTIMEOUT local

MENU TITLE Automated PXE Boot Menu

LABEL local
    MENU LABEL Boot from Local Disk
    LOCALBOOT 0

LABEL ${OS_NAME}
    MENU LABEL Install RHEL 9
    KERNEL images/${OS_NAME}/vmlinuz
    APPEND initrd=images/${OS_NAME}/initrd.img \
    ip=dhcp \
    inst.repo=http://${PXE_SERVER_IP}/${OS_NAME}

LABEL rescue
    MENU LABEL Rescue Installed System
    KERNEL images/${OS_NAME}/vmlinuz
    APPEND initrd=images/${OS_NAME}/initrd.img rescue

EOF

# -----------------------------
# Configure DHCP
# -----------------------------

echo "Creating DHCP configuration..."

cat <<EOF > /etc/dhcp/dhcpd.conf

default-lease-time 600;
max-lease-time 7200;
authoritative;

allow booting;
allow bootp;

subnet ${SUBNET} netmask ${NETMASK} {

    range ${RANGE_START} ${RANGE_END};

    option routers ${GATEWAY};
    option subnet-mask ${NETMASK};
    option domain-name-servers 8.8.8.8;

    next-server ${PXE_SERVER_IP};
    filename "pxelinux.0";
}

EOF

# -----------------------------
# SELinux Adjustments
# -----------------------------

echo "Configuring SELinux..."

setsebool -P tftp_home_dir on

restorecon -Rv ${TFTP_ROOT}

# -----------------------------
# Restart Services
# -----------------------------

echo "Restarting services..."

systemctl restart dhcpd
systemctl restart httpd
systemctl restart tftp.socket

# -----------------------------
# Display Status
# -----------------------------

echo
echo "========================================"
echo " PXE SERVER SETUP COMPLETED"
echo "========================================"
echo
echo "PXE Server IP : ${PXE_SERVER_IP}"
echo "HTTP Repo     : http://${PXE_SERVER_IP}/${OS_NAME}"
echo "TFTP Root     : ${TFTP_ROOT}"
echo
echo "Boot target systems using PXE network boot."
echo