In the last 5 years "Docker Image"'s have become the most prevalent way for storing and shipping applications. Although we often use the Docker Buzz word, iby now it has mostly little to do with the company Docker, Inc. or the Docker software product.
The Open Container Initiative was formed as an open governance structure for the express purpose of creating open industry standards around container formats and runtimes. Docker has donated its container format and runtime as the basis.
This opened the marked for different runtimes (Possible Kubernetes Container Runtimes).
- runC from Docker
- Containerd (CNCF Graduated)
- CRI-O (CNCF Incubating)
- rkt (acquired and discontinued by Red Hat)
The Open standard also lead to new tools for building container images.
A combined project out of Heroku and Cloud Foundry.