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crun

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description crun Overview

Crun is a container runtime designed for Red Hat’s OCI Runtime project. It leverages the runc kernel compatibility layer to provide secure and efficient container execution. Crun utilizes cgroups for resource management and supports layered filesystem images. This makes it suitable for developers and system administrators building and deploying containerized applications, particularly those prioritizing security and performance within a Red Hat environment.

help crun FAQ

What is crun used for in a container stack?

crun is an OCI container runtime, meaning it is the low-level component that actually starts and manages containers. It is commonly used underneath tools such as Podman, Buildah, and CRI-O.

How is crun different from runc?

crun is written in C, while runc is written in Go, and crun is often chosen for lower memory use and faster startup. Both implement the Open Container Initiative runtime specification, so they fill the same basic role.

Why do Podman users often mention crun?

Podman can use crun as its runtime, especially on Linux systems where rootless containers and cgroup v2 support matter. Fedora and Red Hat container tooling have been closely associated with crun adoption.

Does crun replace Docker?

No, crun does not replace the whole Docker-style platform. It replaces only the low-level runtime layer, while higher-level tools still handle images, networking, volumes, and command-line workflows.

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