Convert ISO images to docker images

#sofianehamlaoui #dockerimage #converting #iso

🐳 Convert ISO images to docker images

Yep! I was looking for a method or a trick to convert ISO files to docker images, It was hard to find one ! But the only one was not really explained and lacking some information. So here we are !!

Choosing the ISO file :

Well before starting the process ! Keep in mind that you have to use a live disc , means a bootable version of the operating system.

Before Starting ! :

In this tutorial/story, I’ll use Ubuntu 18.04.3 LTS’s live disc ISO,

Keywords :

rootfs : a file system. In Linux, all file systems have a mount point, which is the directory where the mounted file system connects to the root file system
squashfs : a compressed read-only file system for Linux
unsquashfs : a tool to uncompress squashfs file systems

Requirments :

squashfs-tools : install squashfs-tools in your system
Downlading the LiveCD ISO version

ISO file downloaded & squashfs-tools installed

Let’s start ! :

1- Start by creating the 2 folders (rootfs and unsquashfs)



$: mkdir rootfs unquashfs

2- mount your ISO file to the rootfs folder as a loop device



$: sudo mount -o loop ubuntu-18.04.3-desktop-amd64.iso rootfs

3- Find the filesystem.squashfs file



$: find . -type f | grep filesystem.squashfs

4- use unsquashfs to extract filesystem files to the unsquashfs folder (that would take between 5–10mins)



$: sudo unsquashfs -f -d unsquashfs/ rootfs/casper/filesystem.squashfs

Extractingthe filesystem files to the unsquashfs folder

5- compress and import the image using docker (that would take some time 10–20 mins)



$: sudo tar -C unsquashfs -c . | docker import - sofiane/myimg

6- you will get a sha256 hash (somthing like this )



$:sha256:qf917d58831f926c6b93ff84bd6az68550a6cd6c36aeb6c837c53d655d9453sh

***Compressing then importing the image using docker***

7- test your docker image :



$:docker run -h ubuntu -i -t sofiane/myimg bash

And here you go !

Thank you for reading,

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