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I am using the ubuntu:16.04 image, but apparently it doesn't have the hexdump package (because some other stuff I do in the image are failing because of it). So, I tried to apt-get install hexdump but got an error E: Unable to locate package hexdump.
When I search for info online it seems like this package should be installed with Ubuntu by default, but maybe in the Docker image it was stripped out. And thus I can't really find sources for how to install it.
Add the following command in the Dockerfile of the image:
RUN apt-get install bsdmainutils
hexdump utility is part of bsdmainutils package.
Alternatively, you could use xxd from the xxd package
You can generate docker image based on ubuntu 16.04 and copy xxd from ubuntu LTS into docker image.
The Dockerfile looks like
FROM amd64/ubuntu:16.04
COPY xxd /usr/bin/xxd
