As we discussed in previous posts, that Docker team re-factored, extracted and donated containerd as container runtime to the CNCF in Mar’2017. As of docker engine 1.11, docker engine switch to containerd as default runtime as well and it has been there since. containerd implements downloading images, managing them, and running containers from images. When it needs to run a container it unpacks the image into an OCI runtime bundle and shells out to runc to run it. Also, containerd is platform agnostic, so you can run it on pretty much any OS.Read More »
Docker Engine from Docker, Inc has been at forefront of technology, when it comes to containers. It was so synonymous with containers, that docker and containers used to mean the same thing for a long time. It used to be so till the time Kubernetes and OCI came and confusion has taken over since. However, Docker Engine contains so many UX enhancements, that it feels like magic till today and still a recommended option for anyone starting to get their hands dirty in container technology. What we call Docker Engine or simply docker, is composed of many small components tied together like a car engine. Note that Docker Engine is further a small component in set of tools included in the Docker Desktop, which in itself is a separate world.Read More »
In the Kubernetes release v1.20, the development team has marked dockershim as deprecated. There was initially some shock and confusion, as it was perceived that team is moving away from docker completely, however that is not the case. As its turns out, what the team is doing, is steering the Kubernetes away from the proprietary parts of Docker or Docker Engine or just simply called Docker. The Docker Engine is further comprised of many different sub-components like dockerd, containerd, runc etc., many of which were initially developed by Docker Inc and then given away to community. These were later standardized and maintained by the community.
The Kubernetes community has written a detailed blog post about deprecation with a dedicated FAQ page for it. This blog post is being written to understand the impact and what needs to be done about it. Depending on how do you use Docker, think and understand about it, you may or may not have to do anything about it or get worried about sleepless nights.Read More »
Podman is a daemonless container engine for developing, managing, and running Open Container Initiative (OCI) containers and container images on your Linux System. It is an open-source project that is available on most Linux platforms and resides on GitHub. Containers under the control of Podman can either be run by root or by a non-privileged user. Podman provides a docker engine compatible command interface and most of the commands can simply be used by
alias docker=podman for experience professionals on docker. However, that said, Podman is not a replacement of dockerd, docker compose and docker swarm yet. In this post, we’ll learn the basic operations with Podman as container engine.