Containers can run any Linux distribution, and any version thereof. The only thing you can't do is customize the kernel, but 99.99% of applications do not need

Containers can run any Linux distribution, and any version thereof. The only thing you can't do is customize the kernel, but 99.99% of applications do not need this. Then there's emerging technologies like rump kernels, which might permit endless kernel customization with very tiny overhead... even emulating other OSes.