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Customizing your Docker image with RUN

Customizing your Docker image with RUN - Docker Tutorial

From the course: Docker Essential Training

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Customizing your Docker image with RUN

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- [Instructor] A Docker image would be pretty useless if we could only copy files into it. Fortunately, the RUN Command provides a really flexible way for us to customize and configure our image. The RUN command runs shell commands within temporary containers. These containers are created from image layers generated by the Docker file commands that preceded them. Here are a couple of files to explain what I mean. Right now, our Docker file looks kind of like the first two lines in this image here. It only contains the FROM commands that will link layers within the latest Ubuntu image to our Docker file, and a COPY command that creates a new layer on top of that, which will contain our exercise files in a directory called /app. Now, let's say we wanted to throw in a RUN command that does something that we want like say RUN stat /app. Because RUN runs shell commands and containers, when Docker sees this line in our Docker file,…

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