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img is more cache-efficient than Docker and can also execute multiple build stages concurrently, as it internally uses BuildKit's DAG solver.
The commands/UX are the same as docker {build,tag,push,pull,login,logout,save} so all you have to do is replace docker with img in your scripts, command line, and/or life.
This a glorified cli tool built on top of buildkit. The goal of this project is to be able to build container images as an unprivileged user.
Running unprivileged allows companies who use LDAP and other login mechanisms to use img without needing root. This is very important in HPC environments and academia as well.
Currently this works out of the box on a Linux machine if you install via the directions covered in installing from binaries. This installation will ensure you have the correct version of img and also runc.
The ultimate goal is to also have this work inside a container. There are patches being made to container runtimes and Kubernetes to make this possible. For the on-going work toward getting patches into container runtimes and Kubernetes, see:
