There are Windows Server containers. Docker runs on FreeBSD using jails and Solaris using zones. Hyper runs containers on hypervisors and RancherVM on KVM. Con

There are Windows Server containers. Docker runs on FreeBSD using jails and Solaris using zones. Hyper runs containers on hypervisors and RancherVM on KVM. Container now has two meanings: the isolated application, and the container-based virtualization on Linux. The latter is the original usage (LXC is older than Docker). But the important innovation of Docker is combining containers with image distribution. The isolated application is more general then virtual machine so the concept is extended to other virtualization techniques.