Ruby on Railsにおけるdatabase.ymlの設定方法 - Qiita

default: &default adapter: mysql2 encoding: utf8 pool: 5 username: <%= ENV['RAILS_DATABASE_USER'] %> password: <%= ENV['RAILS_DATABASE_PASSWORD'] %> socket: /var/lib/mysql/mysql.sock development: <<: *default database: rails-devise-ja-development test: <<: *default database: rails-devise-ja-test production: <<: *default database: rails-devise-ja username: <%= ENV['RAILS_DATABASE_USER'] %> password

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“socket: /var/lib/mysql/mysql.sock”