Write a example dockerfile with 2 CMD, 2 ENTRYPOINT and 1 CMD/1ENTRYPOINT and write down a behaviour of it.

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Dockerfile with 2 CMD, 2 ENTRYPOINT:

File content:

FROM ubuntu
MAINTAINER Sunil << r.s.sunil@gmail.com>>
CMD "World" 
CMD echo "DOCKER"
ENTRYPOINT ["/bin/echo", "Hello"]
ENTRYPOINT ["/bin/echo", "Welcome to"]

Output:

Welcome to /bin/sh -c echo “DOCKER”

Observations:

Both CMD and ENTRYPOINT entries will be overwritten with the latest entries.
That is only the last CMD and ENTRYPOINT will be taken.
Also the values specified in CMD will be add as an argument to the ENTRYPOINT command.

Dockerfile with 1 CMD, 1 ENTRYPOINT:

File content:

FROM ubuntu
MAINTAINER Sunil << r.s.sunil@gmail.com>>
CMD "World" 
ENTRYPOINT ["/bin/echo", "Hello "]

Output:

Hello World

Observations:

Values specified in CMD will be add as an argument to the ENTRYPOINT command.