February 2019
Intermediate to advanced
240 pages
5h 25m
English
Content preview from Docker for Rails Developers
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The Finishing Touch
Our Dockerfile is glorious, isn’t it? A masterpiece. This little baby is going to get our Rails app development really going places. So let’s do what all true artists do and sign our work.
Unlike a painter who signs the bottom right of their canvas, Docker aficionados typically assert their authorship of an image by setting a maintainer label as the second instruction. A label is simply a piece of metadata associated with an image.
We set a label using the LABEL instruction, which has the following format:
| | LABEL <key>=<value> |
This gives the image a label named key set to value.
To indicate who is responsible for maintaining the file, we would modify our Dockerfile to specify their email address like so (you can substitute ...
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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.