A 2018 analysis found that a typical Docker use case involves running eight containers per host, and that a quarter of analyzed organizations run 18 or more per host. īecause Docker containers are lightweight, a single server or virtual machine can run several containers simultaneously. Docker on macOS uses a Linux virtual machine to run the containers. When running on Linux, Docker uses the resource isolation features of the Linux kernel (such as cgroups and kernel namespaces) and a union-capable file system (such as OverlayFS) to allow containers to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines. This enables the application to run in a variety of locations, such as on-premises, in a public cloud, and/or in a private cloud. ĭocker can package an application and its dependencies in a virtual container that can run on any Linux, Windows, or macOS computer. Docker can use different interfaces to access virtualization features of the Linux kernel.
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