Project News

Building a Buildah Container Image for Kubernetes

Background

Dan Walsh (@rhatdan) asked me to look into building a working Buildah container image. This was not just a cool experiment. It has a real purpose. As many readers know, Dan is not a fan of big fat daemons. This has become less of an issue when running containers in Kubernetes as there is an alternative with CRI-O. CRI-O provides kubernetes a standard interface to OCI compliant runtimes. runC is the reference implementation of the OCI runtime specification. Kubernetes calls the runtC runtime through CRI-O and runC then talks to the Linux kernel to run a container. This bypasses the need for the Docker daemon, and containerd. With CRI-O, there is no requirement for the Docker daemon for a kubernetes cluster to run containers.

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Fedora Atomic Host 27.93 is available. We have a new kernel (4.15), ostree, and rpm-ostree in this release.

It is also worth noting that now the rpm-ostree status output will prefix the remote:ref with ostree:// in order to denote the system is following an ostree repository remote (see example below). This is in preparation of some upstream changes related to rpm-ostree rojig, where updates can be delivered via a special rpm in a yum repo rather than an ostree server/remote.

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I’m a fan of Isaac Asimov’s Three Laws of Robotics and I’m beginning to wonder if these laws need to be wired into Buildah. You see Buildah builds itself. It’s self-propagating.

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Podman (formerly kpod) has been kicking around since last summer. It was originally part of the CRI-O project. We moved podman into a separate project, libpod. We wanted Podman and CRI-O to develop at their own pace. Both CRI-O and Podman work fine as independent tools and also work well together.

The goal of Podman (Pod Manager) is to offer an experience similar to the docker command line - to allow users to run standalone (non-orchestrated) containers. Podman also allows users to run groups of containers called pods. For those that don’t know, a Pod is a term developed for the Kubernetes Project which describes an object that has one or more containerized processes sharing multiple namespaces (Network, IPC and optionally PID).

Podman brings innovation to container tools in the spirit of Unix commands which do “one thing” well. Podman doesn’t require a daemon to run containers and pods. This makes it a great asset for your container tools arsenal.

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We’re pleased to announce the release of Buildah Alpha version 0.12 on both Fedora 26 and Fedora 27. As always, the latest Buildah can also be acquired from GitHub for any other Linux distribution.

The Buildah project has been building some steam over the past several weeks, welcoming several new contributors to the mix, launching new functionality and creating a number of improvements and bug fixes. The major highlights for this release are:

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