Rootless containers

Nov 2019

Ideally, containers should be managed and run by the respective container runtime without root privileges. This is not trivial but when achieved, it reduces the attack surface and avoids whole classes of security problems, notably privilege escalation out of the container. The community has discussed this as rootless containers for quite a while, and it is part of the open container runtime specification and its standard implementation runc, which underpins Kubernetes. Now, Docker 19.03 introduces rootless containers as an experimental feature. Although fully functional, the feature doesn't yet work with several other features such as cgroups resource controls and AppArmor security profiles.