A Comparison of Linux Container Images
Going back to basics, there are two major parts of an operating system – the kernel and the user space. The kernel is a special program executed directly on the hardware or virtual machine – it controls access to resources and schedules process. The other major part is the user space – this is the set of files, including libraries, interpreters, and programs that you see when you log into a server and list the contents of a directory such as /usr or /lib.
Linux containers essentially break the two pieces of an operating system up even further allowing the two pieces to be managed independently – the container host and the container image. The container host is made up of an operating system kernel and a small user space that has a minimal set of libraries and daemons necessary to run containers. The container image is made up of the libraries, interpreters, and configuration files of an operating system user space, as well as the developer’s application code.
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