If you make a change to a layer through a DockerFile (see Building Containers), than Docker rebuilds that layer and all subsequent layers but not the layers that are notĪffected by the build. You can think of layers as intermediate images that add some capability to the overallĬontainer. The layers are combined to create the container. Systems uses Docker containers as the mechanism forĪ Docker container is composed of layers. Therefore, all kernel calls from the container are handled by the host system kernel. Unlike a VM which has its own isolated kernel, containers use the host system kernel. Its libraries, data files, and environment variables so that the execution environment isĪlways the same, on whatever Linux system it runs and between instances on the same host. A Docker container is a mechanism for bundling a Linux application with all of
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