Dockerfile instruction Introduction

Instructions	Function
FROM	The current image is based on which mirror image, the first instruction must be from
MAINTAINER	Mirror maintenanceer’s name and mailbox address
RUN	Directives that need to be run when building a mirror
EXPOSE	The port number of the current container exposed to the outside
WORKDIR	Specify the working directory of the terminal login default after creating a container
ENV	Used to set environment variables in the process of building mirror
ADD	Copy the files in the host directory into the mirror, and the ADD command will automatically process URL to reconcile the tAR package
COPY	Similar functions to ADD, copy files and directory to mirrors, will be copied from the file/directory in the context directory to the position in the new layer of mirror
VOLUME	container data volume, for data preservation and persistent work
CMD	Specify the command to run when a container is started. There can be multiple CMD instructions in Dockerfile, but only the last one will take effect.
ENTRYPOINT	Specify the command to run when a container is started, specify the container startup program and its parameters
ARG	Constructing parameters is consistent with ENV, but the role is different. The environment variables set by ARG are only effective in Dockerfile, that is, it is effective in the process of only Docker Build. There is no such environment variable in the constructive mirror.

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