Docker containers aren't running a kernel. They're using cgroups/namespaces to isolate themselves from other programs running on the host kernel. If you run fi

Docker containers aren't running a kernel. They're using cgroups/namespaces to isolate themselves from other programs running on the host kernel. If you run five containers on a host, you're not running five kernels. You're running five instances of a Linux userspace/application, sharing the same kernel, but isolated from each other.