This example is from latex-builder
Why I migrated to buildah?
I don’t use anymore Docker excepted on my laptop (macOS) for a limited things and buildah is available in repositories.
Also because I prefer a shell script or other true solution (hello Python) instead of using a configuration language which is limited by definition.
My usage of Docker daemon
In production, I have few VMs with Docker daemon just for Drone Agent, Archery and few other things… I hope to replace it quickly by podman.
Shell is beautiful
It’s more simple to implement conditions in Shell than Dockerfile, also when you need to decide some things depending of another process (external from building image).
It’s the best way to integrate external files when you need to download it.
mnt=$(buildah mount $mk) git clone https://gitlab.kitware.com/kmorel/UseLATEX.git mv UseLATEX/UseLATEX.cmake $mntimg/usr/share/cmake-*/Modules/ rm -rf $mnt#/var/cache/pacman/pkg/* git clone https://github.com/sycured/pdfcompressor.git mv pdfcompressor/pdfcompressor $mntimg/usr/local/bin/ chmod 555 $mntimg/usr/local/bin/pdfcompressor buildah unmount $mk#</code></pre>
Directly, I use curl for the host to download files where I need them, it’s more easy to operate in filesystem than doing it in RUN where you need to remember that the same thing in Docker without using a lot of layer is a long line with multiple “&&”
OCI vs Docker format : Docker Hub is an asshole
Docker Hub doesn’t support default format from buildah (OCI) and need his format : Docker… It’s why, I’ve a double commit and push…
buildah commit --squash "$mk#" "buildah-vfs" buildah commit --squash --format docker "$mk#" "buildah-vfs-docker"
- echo $DCKIOAK | buildah login -u sycured --password-stdin docker.io - buildah push latex-builder-docker:latest docker://sycured/latex-builder:latest - buildah logout docker.io - echo $QUAYIOAK | buildah login -u sycured --password-stdin quay.io - buildah push latex-builder:latest docker://quay.io/sycured/latex-builder:latest - buildah logout quay.io
My Quay.io for public repositories.
CI/CD more easy
I use buildah to build all my images in CI/CD and it’s a lot more easy. I just need a distribution where I can install buildah (Debian, Red Hat Enterprise Linux … no limit) and it’s better about universality.
It’s impossible when you can finally use a secure (rootless and without daemon) and with the possibility to use any language instead of Dockerfile. In addition, Docker doesn’t permit to integrate external step in Dockerfile easily where buildah has this concept from the first day.
Freedom is also in the usage of the tool, Docker has no concern about the community and it’s more proprietary (vendor lock) philosophy.
Now, I can use shell function and more when I build a container.
Docker is forbidden in production !
Docker is ready to finish inside a black hole. We don’t need insecure tool like Docker.
In addition, buildah is included in Red Hat Enterprise Linux.