Build all these 5 images and run container and observe the use cases of it.

https://devopsschool.com/tutorial/docker/dockerfile/dockerfile-example-sample-lab.html

• Docker File 1: /usr/sbin/apache2ctl specified in CMD will run in foreground as a blocking call.
• Docker File 2: Just exit after echoing “Hello world”.
• Docker File 3: Just exit after echoing “Hello”.
• Docker File 4: Same as ‘Docker File 1‘ except port 80 will be shown as exposed port.
• Docker File 5: Output will be print like : “Hello /bin/sh -c echo “Hello world””. First it will execute ENTRYPOINT then content of CMD will be passed as an arument that entry point command.