Dockerfile Commands

A list of commands are defined to build Docker image.

• FROM

The first statement/command in the docker file which tells which image to download and start from.

• MAINTAINER

Describes the author of the docker file.

MAINTAINER <First name> <Last name> <email address>

• RUN

Run a command, wait for the result and then saves the result.

RUN echo hello docker

• ADD

Adds local files, contents of a tar archives and works with urls.

• ENV

Helps to set environment variables, both during the build and when running the result.

ENV artifactId=com.org.artifactId

• ENTRYPOINT

Specifies the start of the command to run

• CMD

Specifies the whole command to run

• EXPOSE

Maps a port into the container

EXPOSE 8080

• VOLUME

Defines shared or ephemeral volumes.

VOLUME [“/host/path/” “/container/path/”]

VOLUME [“/shared-data”]

• WORKDIR

Sets the directory the container starts in. It is similar to use ‘cd’ after start.

WORKDIR /install/

• USER

Sets which user the container will run as.

USER bimal

USER 1000