Discussion
A container differs from a virtual machine in that it
Answer: A
Correct answer: shares the host kernel
A container is a process on the host, isolated by namespaces and limited by cgroups, and it uses the host’s kernel rather than booting one of its own. That is why it starts in milliseconds and costs a few megabytes, where a virtual machine must boot a complete operating system on virtual hardware - and it is also why the isolation is weaker, as the next item makes explicit.
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