bootc.md

bootc

Transactional, in-place operating system updates using OCI/Docker container images.

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What is a Bootable Container?

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Updating Bootable Containers

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basic concepts

• Bootc
• Filesystem Layout: https://docs.fedoraproject.org/en-US/bootc/filesystem/
  • Bootc systems follow the concept of an immutable operating system. Apart from the following two exceptions, /etc and /var, all directories are mounted read-only once deployed on a physical or virtual machine
  • composefs for the root filesystem by default. https://github.com/composefs/composefs
• systemd: systemd is NOT running in a standard container-build environment.
  • Starting a systemd service via systemctl start, for instance, will not work.
  • Configuring a service to start at boot time via systemctl enable, however, works.
• Base Images:
  • Fedora
  • CentOS Stream
  • Red Hat Enterprise Linux (RHEL)
• Building bootc Images
• Conversion to Disk Images
• Running as a container
• podman-bootc
• Authentication, Users, Groups
• Installing on Bare Metal
• Updating Bootable Containers
• Building disk images
  • raw: Common image format used by many virtualization tools
  • qcow: An image format primarily used by QEMU
  • iso: For creating bootable media using tools like Balena Etcher
  • vmdk: For creating VMs using VMWare Workstation or ESXi
  • ami: For creating virtual servers on Amazon EC2

best practices

You may find solutions in our examples repository. https://gitlab.com/fedora/bootc/examples

• https://docs.fedoraproject.org/en-US/bootc/building-containers/

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ref

• bootc: https://github.com/bootc-dev/bootc
• bootc-image-builder: https://osbuild.org/docs/bootc/
• https://github.com/cdrage/containerfiles (HOT)
• https://docs.fedoraproject.org/en-US/bootc/getting-started/
• https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html/using_image_mode_for_rhel_to_build_deploy_and_manage_operating_systems/index
• Fedora bootc base images: https://gitlab.com/fedora/bootc/base-images
• https://github.com/osbuild/bootc-image-builder
• https://developers.redhat.com/articles/faqs-no-cost-red-hat-enterprise-linux#general
• https://discussion.fedoraproject.org/tag/bootc-initiative
• https://github.com/containers/podman-bootc
• https://www.unixsysadmin.com/creating-custom-rhel-bootc-disk-images/
• https://github.com/josephaw1022/FirstTryAtK3sWithBootc