Kubernetes vs Docker: Understanding Containers in 2021

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A few weeks ago, the Kubernetes development team announced that they are deprecating Docker. This piece of news made the rounds through tech communities and social networks alike. Will Kubernetes clusters break, and if so, how will we run our applications? What should we do now? Today, we’ll examine all these questions and more.

Let’s start from the top. If you’re already familiar with Docker and Kubernetes and want to get to the juicy parts, skip to how does the Dockershim deprecation impact you?

What is a Container?

Even though Docker is used as a synonym for containers, the reality is that they have existed long before Docker was a thing. Unix and Linux have had containers in some form or another since the late 70s, when chroot was introduced. Chroot allowed system admins to run programs in a kind-but-not-really-isolated filesystem. Later, the idea was refined and enhanced into container engines such as FreeBSD Jails, OpenVZ, or Linux Containers (LXC).



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