Dockerfile ADD failed : No Source files were specified

It generally is recommended to use COPY before ADD, because it serves a lesser purpose and is somewhat more lightweight.

To copy your whole directory into the image, just add the following line after editing:

 COPY . /path/to/dir/in/image

Some helpful links to start writing dockerfiles:

Reference

Best Practices

Postgresql example

I had the same error message. It was a .dockerignore next to my Dockerfile wich was ignoring my file.

In a Java project, the problem was the lack of a JAR file in the target folder. It was necessary to make (in the case of maven) the mvn clean package, and then make the docker run command.