container tools

container as pristine environment

container as development environment

What is Fedora Silverblue?

• immutable OS: /usr is read-only
• uses rpm-ostree instead of dnf
• image deployments: atomic updates

Fedora Atomic project

Fedora Atomic Host → Fedora CoreOS

Fedora Atomic Workstation → Fedora Silverblue

RHEL Atomic Host → RHEL CoreOS

CentOS Atomic Host

Adding software to Fedora Silverblue

• package layering (rpm-ostree)

• Flatpaks

• how about containers?

Shell script developed by Debarshi Ray (@rishi)
in the Red Hat Desktop team

debarshiray/toolbox on Github

Toolbox

uses

Toolbox image

registry.fedoraproject.org/
f30/fedora-toolbox:30

Toolbox script

/usr/bin/toolbox

toolbox create

toolbox enter

toolbox run

Toolbox containers surprisingly complicated

Toolbox pros

• self-contained development environment
  • avoids host package clutter
• easy Fedora Rawhide container environment for development
• saves disk-space by sharing /home
• can run apps from toolboxes on the desktop
  • eg I run Emacs from my Toolbox

Toolbox problems

• moving targets: podman
• takes time getting used to host/toolbox split
• mock & ping only work in host
  • can use flatpak-spawn for xdg-open
• (need VM for real testing)

Other Toolboxes

• cgwalters/coretoolbox

• coreos/toolbox

Contact

petersen@redhat.com

@juhp

https://petersen.fedorapeople.org/talks/devconf.in-2019-pet-containers

More information

https://silverblue.fedoraproject.org/

https://github.com/debarshiray/toolbox

https://podman.io/

https://flatpak.org/