# RHEL 8.10 Offline Update Script

An interactive bash script for applying RHEL 8.10 updates from a local ISO file in air-gapped or disconnected environments.

## Overview

This script guides administrators through the process of mounting an update ISO and applying patches to RHEL 8.10 systems that cannot reach Red Hat's CDN or Satellite servers.

## Requirements

- RHEL 8.10 system
- Root or sudo access
- Update ISO: `Full_Latest_RHEL8_x86_64_patches_2026-01-13.iso`
- ~35 GB free disk space (if copying ISO locally)

## Quick Start

```bash
# Download the script
chmod +x rhel8-iso-update.sh

# Run with sudo
sudo ./rhel8-iso-update.sh
```

## Features

- **Interactive prompts** - Confirms each action before proceeding
- **External media detection** - Automatically finds the ISO on USB drives
- **Unmounted USB support** - Detects and offers to mount USB devices
- **Progress feedback** - Color-coded output for easy reading
- **Reboot detection** - Checks if a reboot is needed after updates
- **Cleanup options** - Offers to remove configs and unmount when finished

## What the Script Does

| Step | Action |
|------|--------|
| 1 | Locates the ISO file (local storage or external media) |
| 2 | Creates mount point at `/media/JanPatch` |
| 3 | Mounts the ISO |
| 4 | Creates repo file at `/etc/yum.repos.d/JanPatch.repo` |
| 5 | Refreshes DNF cache |
| 6 | Displays available updates |
| 7 | Applies updates |
| 8 | Checks if reboot is required |
| 9 | Cleanup (optional) |

## Usage Examples

### ISO Already Copied to Server

If the ISO is already at `/var/isos/Full_Latest_RHEL8_x86_64_patches_2026-01-13.iso`:

```bash
sudo ./rhel8-iso-update.sh
```

The script will detect it and proceed.

### ISO on USB Drive

1. Plug in the USB drive containing the ISO
2. Run the script:

```bash
sudo ./rhel8-iso-update.sh
```

3. The script will detect the USB and offer options:
   - Copy ISO to local storage (recommended for faster updates)
   - Use ISO directly from USB (no wait, but slower updates)

### Manual ISO Path

If your ISO is in a non-standard location, the script will prompt you to enter the path manually.

## Configuration

Default paths used by the script:

| Setting | Value |
|---------|-------|
| ISO filename | `Full_Latest_RHEL8_x86_64_patches_2026-01-13.iso` |
| Default ISO path | `/var/isos/` |
| Mount point | `/media/JanPatch` |
| Repo file | `/etc/yum.repos.d/JanPatch.repo` |
| Repo name | `dvd-rhel-patches` |

To change these defaults, edit the Configuration section at the top of the script.

## Repository Configuration

The script creates the following repo file:

```ini
[dvd-rhel-patches]
name=DVD for RHEL Patches
baseurl=file:///media/JanPatch
enabled=1
gpgcheck=0
```

GPG checking is disabled to avoid signature issues in disconnected environments.

## Cleanup

At the end of the process, the script offers to:

- Disable the `dvd-rhel-patches` repository
- Remove the repo file
- Unmount the ISO
- Unmount USB drives (if used)
- Delete the ISO file to free up space

All cleanup actions require confirmation.

## Troubleshooting

### Script won't run

```bash
# Make sure it's executable
chmod +x rhel8-iso-update.sh

# Run with sudo
sudo ./rhel8-iso-update.sh
```

### ISO not detected on USB

- Ensure the USB drive is plugged in before running the script
- Try running `lsblk` to verify the system sees the drive
- The script searches up to 3 directories deep on external media

### "No repodata found" error

The ISO structure may differ from expected. Check the ISO contents:

```bash
sudo mount -o loop /path/to/iso /mnt/temp
ls -la /mnt/temp
find /mnt/temp -name "repodata" -type d
```

Update the `baseurl` in `/etc/yum.repos.d/JanPatch.repo` to point to the directory containing `repodata/`.

### Updates failing with dependency errors

Try disabling other repos and using only the ISO:

```bash
sudo dnf update --disablerepo="*" --enablerepo="dvd-rhel-patches"
```

## Manual Process

If you prefer to run the steps manually, see the accompanying guide: [RHEL 8.10 Offline Update Guide](rhel8-iso-update-guide.md)

## Files

| File | Description |
|------|-------------|
| `rhel8-iso-update.sh` | Interactive update script |
| `rhel8-iso-update-guide.md` | Manual step-by-step guide |
| `README.md` | This file |

## Author

Cybersecurity Team

## Last Updated

January 2026