add metadata to a Docker image.
organize the Docker images properly
The LABEL Directive
execute commands during the image build time
The RUN Directive
create a new layer on top of the existing layer
install the required packages
update the packages
create users and groups
provide this default initialization command
The CMD Directive
A Dockerfile can execute only one CMD directive.
The FROM Directive
The parent image is the starting point of our custom Docker image.
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