Extract Container Image Filesystem

Building a Docker-like Container From Scratch4 min read (5 min read total)

Extract Container Image Filesystem1 min read

Overview

Using docker create + docker export combo
Using docker build -o
Using ctr image mount
Using crane

Extract Container Image Filesystem

March 24, 2025

1 min read

containers docker ctr crane linux notes

Using `docker create + docker export` combo

docker export $(docker create <Image>) | tar -xC <dest>

Using `docker build -o`

echo 'FROM Image' > Dockerfile

docker build . -o rootfs

# -o only works if BuildKit is used as a builder engine
set DOCKER_BUILDKIT=1

## or use
docker buildx build

Using `ctr image mount`

sudo ctr image pull <Image>

sudo ctr image mount <Image> rootfs

Using `crane`

crane export image | sudo tar -xvC $ROOTFS_DIR

Building a Docker-like Container From Scratch 4 min read (5 min read total)
Extract Container Image Filesystem 1 min read