docker_practice/compose/rails.md

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# 使 Rails
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> `Ruby`
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使 `Compose` `Rails/PostgreSQL`
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Docker `Dockerfile` Docker
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```docker
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FROM ruby
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev
RUN mkdir /myapp
WORKDIR /myapp
ADD Gemfile /myapp/Gemfile
RUN bundle install
ADD . /myapp
```
使 RubyBundler Dockerfile [Dockerfile 使](../image/dockerfile/README.md)
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Rails `Gemfile` `rails new`
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```bash
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source 'https://rubygems.org'
gem 'rails', '4.0.2'
```
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`docker-compose.yml` `docker-compose.yml` 西 web 使 PostgreSQL web
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```yaml
version: "3"
services:
db:
image: postgres
ports:
- "5432"
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web:
build: .
command: bundle exec rackup -p 3000
volumes:
- .:/myapp
ports:
- "3000:3000"
links:
- db
```
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使 `docker-compose run`
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```bash
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$ docker-compose run web rails new . --force --database=postgresql --skip-bundle
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```
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`Compose` 使 `Dockerfile` web 使 `rails new `
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```bash
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$ ls
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Dockerfile app docker-compose.yml tmp
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Gemfile bin lib vendor
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Gemfile.lock condocker-compose log
README.rdoc condocker-compose.ru public
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Rakefile db test
```
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`Gemfile` `therubyracer` 便使 Javascript
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```bash
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gem 'therubyracer', platforms: :ruby
```
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`Gemfile` Dockerfile
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```bash
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$ docker-compose build
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```
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Rails `localhost` `db` postgres
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`database.yml`
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```bash
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development: &default
adapter: postgresql
encoding: unicode
database: postgres
pool: 5
username: postgres
password:
host: db
test:
<<: *default
database: myapp_test
```
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```bash
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$ docker-compose up
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```
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PostgreSQL
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```bash
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myapp_web_1 | [2014-01-17 17:16:29] INFO WEBrick 1.3.1
myapp_web_1 | [2014-01-17 17:16:29] INFO ruby 2.0.0 (2013-11-22) [x86_64-linux-gnu]
myapp_web_1 | [2014-01-17 17:16:29] INFO WEBrick::HTTPServer#start: pid=1 port=3000
```
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```bash
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$ docker-compose run web rake db:create
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```
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web docker 3000