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rails serverコマンドで起動する時のデフォルトポートを変更する方法

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rails serverでrailsを立ち上げるとデフォルトポートが3000となるが、複数のプロジェクトを同時に立ちあげたい時にポートがかぶってしまうので変更をするための方法。boot.rbに以下を追加する。

3001番ポートにする場合

config/boot.rb
require 'rails/commands/server'
module Rails
  class Server
    def default_options
      super.merge({:Port => 3001})
    end
  end
end
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