Docker image without Dockerfile and base image

•

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Docker images are not magick. Although it is better to use the standard methods like "docker build" with a Dockerfile, we can learn much playing with the filesystem and creating each component of the image manually. This presentation describes the way we can start to learn and by following the instructions on GitHub eventually know enough about Docker to create our images manually and fix smaller errors on the filesystem of Docker in case of an emergency.

Software

Docker image without Docker
fi
le…
and without base image
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Image layers
Image
Layer 3
metadata
fi
lesystem
Layer 2
metadata
Layer 1
metadata
fi
lesystem
Empty layer
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Layers must have either
meadata or
fi
lesystem
Image
Layer 3
metadata
fi
lesystem
Layer 2
Layer 1
metadata
fi
lesystem
nonexistent
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

One
fi
nal metadata
fi
le
+ merged
fi
lesystem
Image
Layer 3
metadata
fi
lesystem
Layer 2
metadata
Layer 1
metadata
fi
lesystem
Empty layer
overlayfs2
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Metadata will be copied to the next layer
FROM ubuntu:20.04
localhost/buildtest:v1
LABEL maintainer=itsziget
LABEL
maintainer=itsziget
RUN mkdir /app
RUN echo “version=1.0” > /app/
con
fi
g.ini
LABEL
maintainer=itsziget
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Layers of the base image
localhost/buildtest:v1
LABEL maintainer=itsziget

CMD [“bash”]
RUN mkdir /app
RUN echo “version=1.0” > /app/
con
fi
g.ini
FROM scratch
ADD ubuntu-focal-oci-amd64-root.tar.gz /
CMD [“bash”]
LABEL maintainer=itsziget

CMD [“bash”]
LABEL maintainer=itsziget

CMD [“bash”]
ubuntu:20.04
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

docker run from scratch?
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

What do we need?
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Copy the original data

data dir: /var/lib/docker-backup
What do we need?
Newly installed Docker

data dir: /var/lib/docker
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

What do we need?
Copy the original data

data dir: /var/lib/docker-backup
LABEL maintainer=itsziget
Newly installed Docker

data dir: /var/lib/docker
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Copy the original data

data dir: /var/lib/docker-backup
What do we need?
Compare the
fi
les
LABEL maintainer=itsziget
Newly installed Docker

data dir: /var/lib/docker
/var/lib/docker-backup /var/lib/docker
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

The type of overlay2 related
fi
les in
/var/lib/docker
• BBolt database
fi
les (*.db)

• https://github.com/etcd-io/bbolt

• Metadata (*.json) and logs

• Filesystem layers (read-only image layers and writable container layer)

• block device for quotas (backingFsBlockDev)

• volumes/backingFsBlockDev

• overlay2/backingFsBlockDev

• https://github.com/moby/moby/pull/24771

• https://reece.tech/posts/docker-container-size-quota/
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Follow the instructions:
 
https://github.com/itsziget/tutorial-docker-build/tree/v1.1.0#build-without-a-base-
image

git clone https://github.com/itsziget/tutorial-docker-build.git
cd tutorial-docker-build
git checkout v1.1.0
Tutorial based on this presentation
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

• Author: Ákos Takács

• Website: https://it-sziget.hu

• Facebook: https://facebook.com/itsziget

• YouTube: https://yt.it-sziget.hu
• Video tutorial (speaking in Hungarian): https://youtu.be/SDWkUq15e34
• Source code: https://github.com/itsziget/tutorial-docker-build/tree/v1.1.0
Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

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Docker image without Dockerfile and base image

1. Docker image without Docker fi le… and without base image Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

2. Image layers Image Layer 3 metadata fi lesystem Layer 2 metadata Layer 1 metadata fi lesystem Empty layer Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

3. Layers must have either meadata or fi lesystem Image Layer 3 metadata fi lesystem Layer 2 Layer 1 metadata fi lesystem nonexistent Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

4. One fi nal metadata fi le + merged fi lesystem Image Layer 3 metadata fi lesystem Layer 2 metadata Layer 1 metadata fi lesystem Empty layer overlayfs2 Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

5. Metadata will be copied to the next layer FROM ubuntu:20.04 localhost/buildtest:v1 LABEL maintainer=itsziget LABEL maintainer=itsziget RUN mkdir /app RUN echo “version=1.0” > /app/ con fi g.ini LABEL maintainer=itsziget Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

6. Layers of the base image localhost/buildtest:v1 LABEL maintainer=itsziget CMD [“bash”] RUN mkdir /app RUN echo “version=1.0” > /app/ con fi g.ini FROM scratch ADD ubuntu-focal-oci-amd64-root.tar.gz / CMD [“bash”] LABEL maintainer=itsziget CMD [“bash”] LABEL maintainer=itsziget CMD [“bash”] ubuntu:20.04 Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

7. docker run from scratch? Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

8. What do we need? Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

9. Copy the original data data dir: /var/lib/docker-backup What do we need? Newly installed Docker data dir: /var/lib/docker Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

10. What do we need? Copy the original data data dir: /var/lib/docker-backup LABEL maintainer=itsziget Newly installed Docker data dir: /var/lib/docker Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

11. Copy the original data data dir: /var/lib/docker-backup What do we need? Compare the fi les LABEL maintainer=itsziget Newly installed Docker data dir: /var/lib/docker /var/lib/docker-backup /var/lib/docker Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

12. The type of overlay2 related fi les in /var/lib/docker • BBolt database fi les (*.db) • https://github.com/etcd-io/bbolt • Metadata (*.json) and logs • Filesystem layers (read-only image layers and writable container layer) • block device for quotas (backingFsBlockDev) • volumes/backingFsBlockDev • overlay2/backingFsBlockDev • https://github.com/moby/moby/pull/24771 • https://reece.tech/posts/docker-container-size-quota/ Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

13. Follow the instructions:   https://github.com/itsziget/tutorial-docker-build/tree/v1.1.0#build-without-a-base- image git clone https://github.com/itsziget/tutorial-docker-build.git cd tutorial-docker-build git checkout v1.1.0 Tutorial based on this presentation Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

14. • Author: Ákos Takács • Website: https://it-sziget.hu • Facebook: https://facebook.com/itsziget • YouTube: https://yt.it-sziget.hu • Video tutorial (speaking in Hungarian): https://youtu.be/SDWkUq15e34 • Source code: https://github.com/itsziget/tutorial-docker-build/tree/v1.1.0 Ákos Takács - it-sziget.hu - Docker image without Dockerfile and without base image

Docker image without Dockerfile and base image

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