Running Docker in an Ubuntu Live Disk environment can be a beneficial exercise when you want to test applications in an ephemeral and clean operating system environment without installing or modifying anything on your actual system. This article explores the steps, technical nuances, and considerations required to successfully deploy Docker within an Ubuntu Live Disk.

Introduction

Ubuntu Live Disk is a versatile tool that allows users to run the Ubuntu operating system directly from a USB drive or DVD without installing it on the local storage. While it is commonly used for system recovery, testing, or simply experiencing Ubuntu without any commitment, integrating Docker with such a setup can add powerful capabilities for developers and system administrators.

System Requirements

To run Docker on an Ubuntu Live Disk, you need the following:

• Ubuntu Live ISO: A bootable USB or DVD containing the Ubuntu Live Disk image.
• RAM: While the minimum requirement for basic Ubuntu Live sessions is about 2GB, running Docker containers demands more resources. Ideally, have at least 4GB of RAM.
• Internet Connection: Required for downloading Docker.
• Persistent Storage (Optional): For saving Docker images and configurations across reboots.

Step-by-Step Guide

Boot from Ubuntu Live Disk

1. Create Bootable Media:
   • Download the Ubuntu ISO from the official website.
   • Use a tool like Rufus , Etcher , or UNetbootin to create a bootable USB drive.
2. Boot from USB/DVD:
   • Insert the bootable media into the computer and reboot.
   • Press the relevant key (usually F12 , ESC , or F2 ) to select the boot device.
3. Choose 'Try Ubuntu':
   • When Ubuntu launches, select the "Try Ubuntu" option to enter a live session.

Install Docker in Live Session

Update Package Index

In the terminal, start with updating the package index:

• Volatility: Ubuntu Live Sessions are non-persistent by default. This means any data, including Docker images, will be lost upon reboot unless you use a persistent storage setup.
• Network Settings: Ensure your network settings allow for correct Docker image pulls, especially on managed or restricted networks.
• Performance: Running multiple Docker containers can make the live session sluggish due to RAM and CPU constraints.
• Development: Test applications in a clean environment without virtual machines.
• Education: Demonstrate Docker capabilities without requiring changes to existing systems.
• Troubleshooting: Use Docker in live sessions to mimic production environments for bug reports or testing.