概要
本記事のゴール
以下を参考にDocker + Railsの環境構築を行う。
以下つまづいた点をメモする。
つまづいた点
1. Dockerfileの修正
参考のDockerfileだとエラーが発生したので、修正
FROM ruby:2.6.6
ENV LANG C.UTF-8
ENV TZ Asia/Tokyo
RUN mkdir /app
WORKDIR /app
ADD Gemfile /app/Gemfile
- RUN apt-get update -qq && \
- apt-get install -y build-essential \
- libpq-dev \
- sudo \
- gem install bundler:2.0.1
+ RUN apt-get update -qq
+ RUN apt-get install -y build-essential libpq-dev
+ RUN gem install bundler:2.0.1
RUN bundle install
ADD . /app
2. config/yamlの修正
差分がわかるように以下記載
default: &default
adapter: mysql2
encoding: utf8mb4
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
username: root
password:
- host: localhost
development:
<<: *default
+ host: db
database: app_development
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
<<: *default
+ host: <%= ENV['DB_HOST'] || 'db' %>
database: app_test
3. docker-compose up後
エラー内容
backend | Could not find gem 'mysql2 (>= 0.4.4)' in any of the gem sources listed in your Gemfile.
backend | Run `bundle install` to install missing gems.
backend exited with code 7
解決策
エラーメッセージより、以下を実行する
docker-compose run backend bundle install
docker-compose up
4. localhost:5000 アクセス後
エラー内容
ActiveRecord::NoDatabaseError (Unknown database 'app_development'):
解決策
以下でデータベースを作成してから、再度アクセスする
docker-compose up
docker-compose exec backend bin/rails db:create
エラー内容
Migrations are pending. To resolve this issue, run: rails db:migrate RAILS_ENV=development
解決策
rails db:create後にrails db:migrateを行う
docker-compose exec backend bin/rails db:create
docker-compose exec backend bin/rails db:migrate
参考
https://k-koh.hatenablog.com/entry/2020/02/06/103517