Can you explain the role of a hypervisor in Docker container architecture?

In Docker architecture, a hypervisor is not used directly, as Docker is based on containers, not virtual machines. Containers operate at the operating system level, using its kernel and isolating processes.

However, if Docker is run on a system that does not have native container support (for example, Windows or macOS), a lightweight virtual machine with a hypervisor (such as Hyper-V, VirtualBox, or HyperKit) is used to run Linux containers. In this case, the hypervisor provides hardware virtualization and runs a guest OS, in which the containers operate.

In summary:

• On a pure Linux environment, Docker does not use a hypervisor.
• On Windows/macOS, a hypervisor is used to run a virtual machine with Linux, where containers run.

Thus, the role of the hypervisor is to provide an environment for running containers where native containerization support is absent.