Meta-embedded-containers layer

Non-maintenance notice

This layer was provided as proof-of-concept code to support a series of articles and a talk given in 2020, and is not actively maintained.

Articles:

• Containers on Linux embedded systems
• Embed a container image into a Yocto rootfs

Videos:

• Integrating Docker containers in Yocto - Yocto Project Virtual Summit Europe, October 2020. link to video

Description

The meta-embedded-containers provides two approaches to embed Docker container(s) into a target root filesystem with Yocto.

The first approach is to embed a Docker archive in the root filesystem.

The second approach is to populate the Docker store (i.e. /var/lib/docker directory) into the target root filesystem.

Dependencies

URI: git://git.openembedded.org/meta-openembedded Branch: dunfell

URI: git://git.yoctoproject.org/cgit/cgit.cgi/poky Branch: dunfell

Adding the meta-embedded-container layer to your build

Please run the following command:

$ bitbake-layers add-layer meta-embedded-containers

Documentation

) Three blog papers discuss about embedding a container image(s) inside Yocto root filesystem.

https://blog.savoirfairelinux.com/en-ca/2020/containers-on-linux-embedded-systems/ https://blog.savoirfairelinux.com/en-ca/2020/integrating-container-image-in-yocto/

Customize your image recipe

The image recipe is located under recipes-core/images/embedded-container-image.bb file. In the IMAGE_INSTALL Bitbake variable, you can customize which kind of approach you want:

• container-image: pull the container image(s) and install the Docker store in the target root filesystem,
• container-archive: pull the container image(s) and save the container archive(s) in the rootfs,
• container-multiple-archives: pull the container image(s), save them in the rootfs as archive files and start them with docker-compose at boot.