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Capistrano3でデプロイしたリモートサーバのRailsアプリをローカルでconsoleする

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Capistrano3でUnicorn+Nginxな環境にRailsをデプロイする:初心者向けで、デプロイ自体はできるものの、デプロイ先でrails consoleしたいときってどうすりゃいいんだ…と思ったら、capistrano-rails-consoleという便利なgemがあった。

設定

Gemfile
# 環境変数管理
gem 'dotenv-rails'

gem 'rb-readline'

group :development, :test do
  # デプロイ周り
  gem 'capistrano', '~> 3.2.1'
  gem 'capistrano-rails'
  gem 'capistrano-rbenv'
  gem 'capistrano-bundler'
  gem 'capistrano3-unicorn'
  gem 'capistrano-rails-console' # 手元の環境からデプロイ先のconsoleを使う
end

これでひと通りのデプロイに必要なgemが揃うはず。

コンソール起動

command
$ bundle exec cap staging rails:console

これでstagingサーバのrails consoleが起動するはず。手元でリモートサーバのコンソールいじれるので、ステージングサーバの確認とか、テストデータ挿入とか超便利。

コンソールの起動に失敗する場合

`require': cannot load such file -- readline (LoadError)

こんな感じのエラーが出ていたら、readlineがないのでGemfileにrb-readlineがあるかどうかを確認する。

Looks like your app's ./bin/rails is a stub that was generated by Bundler.

In Rails 4, your app's bin/ directory contains executables that are versioned
like any other source code, rather than stubs that are generated on demand.

Here's how to upgrade:

  bundle config --delete bin    # Turn off Bundler's stub generator
  rake rails:update:bin         # Use the new Rails 4 executables
  git add bin                   # Add bin/ to source control

You may need to remove bin/ from your .gitignore as well.

When you install a gem whose executable you want to use in your app,
generate it and add it to source control:

  bundle binstubs some-gem-name
  git add bin/new-executable

こんな感じのエラーが出ていたら

config/deploy.rb
set :bundle_binstubs, nil # 追記

# set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets bundle public/system public/assets}
# ↓に変更(binを抜く)
set :linked_dirs, %w{log tmp/pids tmp/cache tmp/sockets bundle public/system public/assets}

これでいけるはず。

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