├── Makefile
├── Dockerfile
└── README.md


/Makefile:
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1 | DUMMY: build
2 | VERSION:=2.3
3 | 
4 | build:
5 | 	docker build -t cybercode/alpine-ruby:$(VERSION) $(ARGS) .
6 | 


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/Dockerfile:
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1 | FROM alpine:3.5
2 | 
3 | RUN apk update && apk upgrade && apk --update add \
4 |     ruby ruby-irb ruby-rake ruby-io-console ruby-bigdecimal ruby-json ruby-bundler \
5 |     libstdc++ tzdata bash ca-certificates \
6 |     &&  echo 'gem: --no-document' > /etc/gemrc
7 | 
8 | CMD ["irb"]
9 | 


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/README.md:
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 1 | # `alpine-ruby`: Minimal Ruby image
 2 | 
 3 | This is a *VERY* small mri ruby 2.2.3 image. It uses the [Alpine Linux](https://www.alpinelinux.org) ruby packages, and has `bundler` and minimal ruby packages installed.
 4 | 
 5 | ## Using this package
 6 |  
 7 | ``` Dockerfile
 8 | FROM cybercode/alpine-ruby:2.3
 9 | CMD["/mycommand"]
10 | ```
11 | 
12 | Unlike the [Official Ruby Image](https://hub.docker.com/_/ruby/) or [tinycore-ruby](https://hub.docker.com/r/tatsushid/tinycore-ruby/), it does not create any users or do `ONBUILD` magic and the `CMD` defaults to `irb`.
13 | 
14 | ### Using C-based gems
15 | 
16 | This image does not contain a compiler, etc. The best way to install C-based gems is to install the compiler chain and any development libraries required, run bundle install and remove the libraries all in one `RUN` command. That way the the final image will stay small.
17 | 
18 | For example,  if you are using the `pg` and `nokogiri` gems:
19 | 
20 | ``` Dockerfile
21 | RUN apk --update add --virtual build_deps \
22 |     build-base ruby-dev libc-dev linux-headers \
23 |     openssl-dev postgresql-dev libxml2-dev libxslt-dev && \
24 |     sudo -iu app bundle install --path vendor/bundle && \
25 |     apk del  build_deps
26 | ```
27 | 
28 | **Note**: These instructions used to suggest
29 | 
30 | ``` Dockerfile
31 | sudo -iu app bundle config build.nokogiri --use-system-libraries 
32 | ```
33 | 
34 | before the bundle install. 
35 | 
36 | This fails w/ alpine 3.4 as there is a conflict with the system header files.
37 | 


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