Upgrade RHEL 7.9 to 8.9 bash script

bash

#!/bin/bash

# Register the system (if not already done)
# subscription-manager register --username YOUR_USERNAME --password YOUR_PASSWORD

# Verify the system subscription
subscription-manager status

# Enable necessary repositories
subscription-manager repos --enable rhel-7-server-rpms
subscription-manager repos --enable rhel-7-server-extras-rpms

# Unset Red Hat Subscription Manager to use the latest RHEL 7 content
subscription-manager release --unset

# Install yum-plugin-versionlock if not present
yum install yum-plugin-versionlock -y

# Clear any version locks
yum versionlock clear

# Update all packages
yum update -y

# Reboot the system
reboot

# Wait for system to restart and login again

# Install the Leapp utility
yum install leapp-upgrade -y

# Start the upgrade process with target OS version 8.9
leapp upgrade --target 8.9

# Reboot the system to complete the upgrade
reboot

# The script ends here. Monitor the system for any prompts or messages.