A reasonable use of docker I've seen in the wild is for pluggable machine learning algorithms for aws sagemaker Otherwise it's just somewhere between a chroot

A reasonable use of docker I've seen in the wild is for pluggable machine learning algorithms for aws sagemaker Otherwise it's just somewhere between a chroot jail and a full virtual machine From what I understand, the containers share the host's kernel, and can share each other's userspace if same version, yes?