Minimize image layers by leveraging build cache.įor example, if your build contains several layers, you can order them from the The number of intermediate layers and files.īecause an image is built during the final stage of the build process, you can
Use multi-stage buildsĭrastically reduce the size of your final image, without struggling to reduce To exclude files not relevant to the build (without restructuring your source Installed on the host where you run the docker build command. Those files as build context to the daemon. Performs a git clone of the repository on the local machine, and sends When building an image using a remote Git repository as build context, Docker The examples in this section use here documentsįor convenience, but any method to provide the Dockerfile on stdin can beįor example, the following commands are equivalent:ĭocker build -t myimage:latest -f- << EOF Or in situations where the Dockerfile is generated, and should not persist Piping a Dockerfile through stdinĬan be useful to perform one-off builds without writing a Dockerfile to disk, Pipe Dockerfile through stdinĭocker has the ability to build images by piping Dockerfile through stdin See Build context page for more information. Methodology to get a feel for the motivations of running containers in such a Refer to Processes under The Twelve-factor App By “ephemeral”, we mean that the container can be stoppedĪnd destroyed, then rebuilt and replaced with an absolute minimum set up and The image defined by your Dockerfile should generate containers that are asĮphemeral as possible. General guidelines and recommendations Create ephemeral containers The running container, such as writing new files, modifying existing files, andĭeleting files, are written to this writable container layer.įor more on image layers (and how Docker builds and stores images), seeĪbout storage drivers. (the “container layer”) on top of the underlying layers. When you run an image and generate a container, you add a new writable layer CMD specifies what command to run within the container.COPY adds files from your Docker client’s current directory.FROM creates a layer from the ubuntu:18.04 Docker image.# syntax=docker/dockerfile:1 FROM ubuntu:18.04 COPY.
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