February 2019
Intermediate to advanced
240 pages
5h 25m
English
Content preview from Docker for Rails Developers
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Caching Issue 2: Unnecessary Gem Installs
Imagine that we want to make a change to our README.md file. Open this file in an editor, and replace the Rails default version with the following:
| | # README |
| | |
| | This is a sample Rails application from Docker for Rails Developers (PragProg). |
| | It was generated using Docker without Ruby installed on the local machine. |
| | |
| | We're using the app to discover the wonderful world of Rails with Docker. |
Now let’s try something. What happens if we rebuild our image:
| | $ docker build -t railsapp . |
| | Sending build context to Docker daemon 102.9kB |
| | Step 1/6 : FROM ruby:2.6 |
| | ---> f28a9e1d0449 |
| | Step 2/6 : RUN apt-get update -yqq && apt-get install -yqq --no-install- |
| | recommends nodejs |
| | ---> |
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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.
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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.