How does the operating system affect the functioning of Docker containers?

Docker containers utilize features of the operating system kernel, such as namespaces and control groups (cgroups), to isolate processes and resources. Therefore, containers depend on the host OS: they do not contain a full OS but use the host's kernel.

This means that:

• Linux containers run on Linux hosts, using the Linux kernel.
• On Windows, virtualization (e.g., WSL2) is used to run Linux containers.
• Windows containers require a Windows host.

Thus, the operating system influences the available container features, their performance, and compatibility. Containers do not emulate an OS but share the host's kernel.