Union mount
Union mounting is a way of combining multiple file systems into one that appears to contain their combined contents.
Building a tool to build OCI container images
Follow my journey as I learn Golang by exploring popular repositories like docker/mody/buildah and, inspired by what I’ve learned, create my very own container-building tool.
Each blog post breaks down the process into easy steps, making Golang and containerization accessible for beginners.
Code is located here: https://github.com/pkorzh/container-build-tool
Usage example:
# this will copy the nginx:latest image into /var/tmp/nginx dir in OCI format
skopeo copy docker://nginx oci:/var/tmp/nginx
cbt from oci-layout:/var/tmp/nginx
# configure image
cbt config nginx --os linux --arch amd64
# create app layer
APP_LAYER_DIR=~/.cbt/nginx/layers/app
mkdir -p $APP_LAYER_DIR
# add content to app layer
mkdir -p $APP_LAYER_DIR/usr/share/nginx/html
echo '<h1>hello world</h1>' >> $APP_LAYER_DIR/usr/share/nginx/html/index.html
cbt build nginx oci-archive:nginx.tar.gz --layers app
Mini container runtime in Go
Run /bin/bash in a containerized environment using Go
Linux kernel namespaces
Namespaces are a Linux kernel feature that provides process isolation; they are a fundamental aspect of containers.
How to Tar/Untar container layers in Go
Tar is archival, or “container” format, meaning it does not provide compression. People use additional tools like Bzip2 or Gzip to compress it.
Building OCI images with Go. No run command yet
In the previous post we learned what OCI images are and how they made. In this post we will see how to automate image creation process with golang.
How-to build OCI Image by hands
Explore how to build OCI container images using no tools
Container build tool
Recently I decided to learn the Go language. After reading the code in the docker and buildah github repos I thought why not write my own image building tool for educational purposes.