51 lines
527 B
Markdown
51 lines
527 B
Markdown
---
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title: Dockerfile
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category: Devops
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layout: 2017/sheet
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---
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## Reference
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{: .-three-column}
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### Inheritance
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```
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FROM ruby:2.2.2
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```
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### Variables
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```
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ENV APP_HOME /myapp
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RUN mkdir $APP_HOME
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```
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### Initialization
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```
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RUN bundle install
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```
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```
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WORKDIR /myapp
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```
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### Onbuild
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```bash
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ONBUILD RUN bundle install
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# when used with another file
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```
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### Commands
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```docker
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EXPOSE 5900
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CMD ["bundle", "exec", "rails", "server"]
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```
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## See also
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{: .-one-column}
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- <https://docs.docker.com/engine/reference/builder/>
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