Dockerfiles
Docker can build images automatically by reading the instructions from a Dockerfile. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. This page describes the commands you can use in a Dockerfile.
Overview
The Dockerfile supports the following instructions:
| Instruction | Description |
|---|---|
| ADD | Add local or remote files and directories. |
| ARG | Use build-time variables. |
| CMD | Specify default commands. |
| COPY | Copy files and directories. |
| ENTRYPOINT | Specify default executable. |
| ENV | Set environment variables. |
| EXPOSE | Describe which ports your application is listening on. |
| FROM | Create a new build stage from a base image. |
| HEALTHCHECK | Check a container’s health on startup. |
| LABEL | Add metadata to an image. |
| MAINTAINER | Specify the author of an image. |
| ONBUILD | Specify instructions for when the image is used in a build. |
| RUN | Execute build commands. |
| SHELL | Set the default shell of an image. |
| STOPSIGNAL | Specify the system call signal for exiting a container. |
| USER | Set user and group ID. |
| VOLUME | Create volume mounts. |
| WORKDIR | Change working directory. |
You will be able to find more information about Dockerfiles on Docker Official Documentation
If you want to have this page available on you machine you can execute the following command:
wget https://raw.githubusercontent.com/docker/docs/main/_vendor/github.com/moby/buildkit/frontend/dockerfile/docs/reference.md > dockerfiles-reference.md