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Usually, Docker used to be "a process with cgroups and namespaces". But it has evolved since then [1], although I'd agree that fundamentally, the "process + cgroups + namespaces" is a correct answer.

[1] From their own FAQ: https://docs.docker.com/engine/faq/#what-does-docker-technol...



Agreed, if I was asking what "Docker" was. I ask what a "container" is to skirt around that. Although I sometimes do ask what is Docker too.


It is just that nowadays the definition of a "Container" depends on the scope, and presumably "Docker" is an instance of a container. But I'd expect an interviewee to reply with "what type of OS-level virtualization tool are you referring to?", in which case you would get both a proper answer and a request for clarification :)




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