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Officially deprecate "rails" 

Given what it is (just a framework), and looking through https://github.com/search?l=dockerfile&q=%22FROM+rails%22&type=Code, I think it's time we finally cut the cord.
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Tianon Gravi 2016-02-26 10:11:37 -08:00
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This image is officially deprecated in favor of [the standard `ruby` image](https://hub.docker.com/_/ruby/), and will receive no further updates after 2016-12-31 (Dec 31, 2016). Please adjust your usage accordingly.
For most usages of this image, it was already not bringing in `rails` from this image, but actually from your project's `Gemfile`, so the only "value" being added here was the pre-installing of `nodejs`, `mysql-client`, `postgresql-client`, and `sqlite3` for various uses of the `rails` framework.
For example, a `Dockerfile` similar to the following would be a good starting point for a Rails project using PostgreSQL:
```dockerfile
FROM ruby:2.3
RUN apt-get update && apt-get install -y postgresql-client --no-install-recommends && rm -rf /var/lib/apt/lists/*
WORKDIR /usr/src/app
COPY Gemfile* ./
RUN bundle install
COPY . .
EXPOSE 3000
CMD ["rails", "server", "-b", "0.0.0.0"]
```