February 2019
Intermediate to advanced
240 pages
5h 25m
English
Content preview from Docker for Rails Developers
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Defining Our First Custom Image
In real life, a factory doesn’t come out of nowhere. It has to be constructed from blueprints: detailed plans and instructions that describe exactly what it’s supposed to look like. Docker’s container factories—in other words, images—are no different. They require a special blueprint file aptly named a Dockerfile. A Dockerfile uses special syntax to describe exactly how the image should be constructed. If you’ve heard the expression infrastructure as code, this is an example of it: a Dockerfile describes how a machine image is configured as shown in the figure.
A Dockerfile is made up of various instructions
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.