Dockerfile

Dockerfile is a text file where you define instructions used to create your Docker images, check official Dockerfile Reference documentation: https://docs.docker.com/engine/reference/builder/

For creating this file with instructions usually called Dockerfile you can use the following keywords:

• ADD
• ARG
• CMD, for executing containers. https://docs.docker.com/engine/reference/builder/#cmd
• COPY
• ENTRYPOINT: https://docs.docker.com/engine/reference/builder/#entrypoint
• ENV
• EXPOSE
• FROM https://docs.docker.com/engine/reference/builder/#from
• HEALTHCHECK https://docs.docker.com/engine/reference/builder/#healthcheck (>= Docker 1.12)
• LABEL
• ONBUILD
• RUN: https://docs.docker.com/engine/reference/builder/#run
• SHELL
• STOPSIGNAL
• USER
• VOLUME, creates a mount point
• WORKDIR

Activities

1. Learn differences between RUN and CMD or ENTRYPOINT: https://stackoverflow.com/a/25150809
2. Read Understand how CMD and ENTRYPOINT interact https://docs.docker.com/engine/reference/builder/#understand-how-cmd-and-entrypoint-interact
3. Learn about start configuration behavior and restart policy
4. Learn about .dockerignore file
5. Read Dockerfile best practices https://docs.docker.com/develop/develop-images/dockerfile_best-practices/

Related terms

• Docker Engine release notes
• BuildKit Dockerfile-agnostic builder toolkit
• docker start
• docker run
• docker build
• Dockerfile examples

See also

• docker-compose, docker-compose.yml: [services | volumes | networks | up | down | restart | logs | create | changelog | version | secrets | config | -v | -h | exec], docker-compose pull, Environment:, Docker-compose.yml examples, .env, release notes, expose:
• Docker: docker-compose, Docker Desktop, Docker Scout, Docker Swarm, Docker Volumes, Docker images management, docker network, docker inspect, docker volume inspect, Dockerfile, Docker Engine release notes,docker kill, moby, Docker-in-Docker, docker context, buildx, docker tag, docker system prune, Docker Hub, hub-tool, /etc/docker/daemon.json, hostconfig.json, dockerd, logs, Docker logging, Backup, docker service, depends on, --dns, --filter, --mount, docker login, docker build, apt remove docker.io, .dockerignore, docker context ls | docker-machine, .docker/, PWD, $HOME/.docker/config.json, Docker ID, --env-file, docker --help
• Makefile

https://en.wikiversity.org/wiki/DevOps/Docker/Dockerfile

https://kapeli.com/cheat_sheets/Dockerfile.docset/Contents/Resources/Documents/index