Dockerfile

Abstract

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• Set of steps for Docker to build Docker Container

Keyword at Runtime

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• Keywords that have an effect when Docker Container is running

ENV

• Set the Environment Variable in the Docker Container

CMD

• Can be used to run commands we want in the Docker Container
• Can be overwritten by the

ENTRYPOINT

• Usually used to specify the executable that will be executed. The executable is usually the application we want to run inside the container
• Can’t be overwritten by the docker run

CMD + ENTRYPOINT

• If executable specified by ENTRYPOINT doesn’t take in any arguments, the stuff specified inside the CMD will be treated as arguments
• If executable specified by ENTRYPOINT ends itself, the stuff specified inside the CMD will execute in its own Process (进程)
• Refer to HashiCorp Vault Dockerfile for an example