Digging into the OCI Image Specification

The OCI Image Specification is the core concept behind container images. However, not much is known about it even though container technologies are becoming more and more popular. In this blogpost we will demystify it and look into its internals.

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Digging Into Runtimes – runc

Everyone knows about Docker but not a lot of people are aware of the underlying technologies used by it. In this blogpost we will analyze one of the most fundamental and powerful technologies hidden behind Docker - runc.

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Why is Exposing the Docker Socket a Really Bad Idea?

It is written almost everywhere: do not expose the Docker socket on Linux! This is followed by the statement that doing so grants root access to the host. But why? What can be done and how? This is what we are about to explore in this article.

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Digging into Linux namespaces - part 2

Process isolation is a key component for containers. One of the key underlying mechanisms are namespaces. In this second (and last) part of the series we examine the USER, MNT, UTS, IPC and CGROUP namespaces, and finally we combine everything to build a fully isolated environment for a process.

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Digging into Linux namespaces - part 1

Process isolation is a key component for containers. One of the key underlying mechanisms are namespaces. We will explore what they are, and how they work, to build our own isolated container and better understand each piece.

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