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Cake day: June 14th, 2023

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  • The point is to minimize privilege to the least possible - not to make it impossible to create higher privileged containers. If a container doesn’t need to get direct raw hardware access, manage low ports on the host network, etc. then why should I give it root and let it be able to do those things? Mapping it to a user, controlling what resources it has access to, and restricting it’s capabilities means that in the event that my container gets compromised, my entire host isn’t necessarily screwed.

    We’re not saying “sudo shouldn’t be able to run as root” but that “by default things shouldn’t be run with sudo - and you need a compelling reason to swap over when you do”




  • Because I associate an OS with more then just an environment. It often has several running apps for instance, often a GUI or shell (which many containers don’t have), are concerned about some form of hardware (virtual or physical), and just… Do more.

    Containers by contrast are just a view into your filesystem, and some isolation from the rest of the environment through concepts like cgroups. All the integrations with the container host are a lot simpler (and accurate) to think of as just simply removing layers of isolation, rather then thinking of it like its own VM or OS. Capabilities just fit the model a lot better.

    I agree the line is iffy since many OS’s leave out a few things of the above, like RTOS’s for MCUs, but I just don’t think it’s worth thinking of a container like its own OS considering how different it is from a “normal” Linux based OS or VM.