This example is from latex-builder
Why I migrated to buildah?
I don’t use anymore Docker excepted on my laptop (macOS) for 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 that is limited by definition.
My usage of Docker daemon
In production, I have a few VMs with Docker daemon just for Drone Agent, Archery, and few other things… I hope to replace it quickly with podman.
Shell is beautiful
It’s more simple to implement conditions in Shell than Dockerfile, also when you need to decide some things depending on another process (external from building image).
It’s the best way to integrate external files when you need to download them.
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 $mk#</code></pre>
Directly, I use curl for the host to download files where I need them, it’s easier to operate in filesystem than doing it in RUN where you need to remember that the same thing in Docker without using a lot of layers is a long line with multiple “&&”
OCI vs Docker format: Docker Hub is an asshole
Docker Hub doesn’t support the default format from buildah (OCI) and needs his format: Docker… It’s why I have a double commit and push…
buildah commit --squash "$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.
I use buildah to build all my images in CI/CD and it’s a lot easier. 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 its more proprietary (vendor lock) philosophy.
Now, I can use the 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 an insecure tool like Docker.
In addition, buildah is included in Red Hat Enterprise Linux.