The Dockerfile.Debug File in the Hello World Docker Demonstration

This topic lists and describes the Dockerfile.Debug file from the Hello World Docker demonstration. The Dockerfile is listed in its entirety and a following table describes the various Dockerfile commands. The line numbers in the listings of the Dockerfile have been added to aid readability. They are not present in the supplied Dockerfile.

001  # Copyright (C) Micro Focus 2018. All rights reserved. 
002  # This sample code is supplied for demonstration purposes only
003  # on an "as is" basis and is for use at your own risk. 
004  
005  ARG DTAG
006  FROM microfocus/cobolserver:${DTAG}
007  
008  # not used
009  ARG PLATFORM
010  
011  # optional arguments
012  ARG APPDIR=c:\\app
013  
014  # set the start directory
015  WORKDIR "${APPDIR}"
016  
017  EXPOSE 6100

The commands on the lines in this Dockerfile are as follows:

Lines	Description
005 - 006	Specifies the base image to use, which is the COBOL Server base image.
009 - 012	Define build arguments passed by the docker build command: APPDIR. Specifies the folder in the image's filesystem that the CICS application is copied into. c:\app is used if this argument is not specified.
015	Sets the Docker working directory to be the folder for the Hello World application in the image's filesystem.
017	Specifies the network ports that the container will listen on at run-time.