【Rails】log writing failed. No space left on deviceというエラーに関する対処法

AWSでテスト運用していた画像投稿サービスがある日突然、画像の投稿が出来なくなりました。
ただ、それ以外には全く問題なくアクセスできます。あくまで、画像の投稿"だけ"が出来なくなりました。

###エラーの内容

①原因を探るため、運用中のAWSのEC２にSSHした時点で、以下のような文言が表示された

/home/サービス名/.rbenv/libexec/rbenv-init: 行 131: ヒアドキュメント用一時ファイルを作成できません: デバイスに空き領域がありません

②一旦停止したpumaを再起動しようとすると以下のエラーが表示

 log writing failed. No space left on device @ io_write - /var/www/rails/サービス名/log/production.log
                                                                                            log writing failed. No space left on device @ io_write - /var/www/rails/サービス名/log/production.log
                             log writing failed. No space left on device @ io_write - /var/www/rails/サービス名/log/production.log
                                                                                                                                 log writing failed. No space left on device @ io_write - /var/www/rails/サービス名/log/production.log
                                                                  * Listening on tcp://0.0.0.0:3000
                                                                                                   * Listening on unix:///var/www/rails/サービス名/tmp/sockets/puma.sock
    bundler: failed to load command: puma (/home/サービス名/.rbenv/versions/2.3.1/bin/puma)
                                                                                          Errno::ENOSPC: No space left on device @ fptr_finalize - /var/www/rails/サービス名/tmp/pids/puma.pid
                            /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/launcher.rb:130:in `close'
                                                                                                                                           /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/launcher.rb:130:in `open'
                                                                                      /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/launcher.rb:130:in `write_pid'
                                      /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/launcher.rb:105:in `write_state'
                                                                                                                                                           /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/single.rb:90:in `run'
                                                                                                  /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/launcher.rb:172:in `run'
                                            /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/lib/puma/cli.rb:74:in `run'
                                                                                                                                                   /home/サービス名/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.6.2/bin/puma:10:in `<top (required)>'
                                                                                             /home/サービス名/.rbenv/versions/2.3.1/bin/puma:23:in `load'
                                                                                                                                                          /home/サービス名/.rbenv/versions/2.3.1/bin/puma:23:in `<top (required)>'

③ df -i の結果は以下の通り。

ファイルシス   Iノード  I使用  I残り I使用% マウント位置
                                                        devtmpfs        124692    428 124264     1% /dev
                                                                                                        tmpfs           127414      1 127413     1% /dev/shm
                                                                                                                                                            /dev/xvda1      524288 100115 424173    20% /

④ nginx.error.logには以下が表示

[alert] 2773#0: *607106 write() to "/var/log/nginx/access.log" failed (28: No space left on device) while logging request, client: 172.31.17.201, server: "サービス名ドメイン", request: "GET / HTTP/1.1", host: "172.31.31.81:10001"

###結論（対応内容）
①production.logの中身を全てクリアした
②production.rbに以下のコードを追加した。

その結果、再度問題なく投稿できるようになりました。

ruby
1config.logger = Logger.new("log/production.log", 5, 10 * 1024 * 1024)

production.rbの全コードは以下の通り

ruby
1Rails.application.configure do
2  # Settings specified here will take precedence over those in config/application.rb.
3
4  # Code is not reloaded between requests.
5  config.cache_classes = true
6
7  # Eager load code on boot. This eager loads most of Rails and
8  # your application in memory, allowing both threaded web servers
9  # and those relying on copy on write to perform better.
10  # Rake tasks automatically ignore this option for performance.
11  config.eager_load = true
12
13  # Full error reports are disabled and caching is turned on.
14  config.consider_all_requests_local       = false
15  config.action_controller.perform_caching = true
16
17  # Disable serving static files from the `/public` folder by default since
18  # Apache or NGINX already handles this.
19  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
20  # config.public_file_server.enabled = true
21
22  # Compress JavaScripts and CSS.
23  config.assets.js_compressor = :uglifier
24  # config.assets.css_compressor = :sass
25
26  # Do not fallback to assets pipeline if a precompiled asset is missed.
27  config.assets.compile = false
28
29  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
30
31  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
32  # config.action_controller.asset_host = 'http://assets.example.com'
33
34  # Specifies the header that your server uses for sending files.
35  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
36  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
37
38  # Mount Action Cable outside main process or domain
39  # config.action_cable.mount_path = nil
40  # config.action_cable.url = 'wss://example.com/cable'
41  # config.action_cable.allowed_request_origins = [ 'http://example.com', /http:\/\/example.*/ ]
42
43  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
44  # config.force_ssl = true
45
46  # Use the lowest log level to ensure availability of diagnostic information
47  # when problems arise.
48  config.log_level = :debug
49
50  # Prepend all log lines with the following tags.
51  config.log_tags = [ :request_id ]
52
53  # Use a different cache store in production.
54  # config.cache_store = :mem_cache_store
55
56  # Use a real queuing backend for Active Job (and separate queues per environment)
57  # config.active_job.queue_adapter     = :resque
58  config.action_mailer.perform_caching = false
59
60  # Ignore bad email addresses and do not raise email delivery errors.
61  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
62  # config.action_mailer.raise_delivery_errors = false
63
64  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
65  # the I18n.default_locale when a translation cannot be found).
66  config.i18n.fallbacks = true
67
68  # Send deprecation notices to registered listeners.
69  config.active_support.deprecation = :notify
70
71  # Use default logging formatter so that PID and timestamp are not suppressed.
72  config.log_formatter = ::Logger::Formatter.new
73
74  # Use a different logger for distributed setups.
75  # require 'syslog/logger'
76  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
77
78  if ENV["RAILS_LOG_TO_STDOUT"].present?
79    logger           = ActiveSupport::Logger.new(STDOUT)
80    logger.formatter = config.log_formatter
81    config.logger = ActiveSupport::TaggedLogging.new(logger)
82  end
83
84  # Do not dump schema after migrations.
85  config.active_record.dump_schema_after_migration = false
86
87  # Exceptions Handler
88  config.exceptions_app = ->(env) { ErrorsController.action(:show).call(env) }
89
90  config.action_mailer.default_url_options = { host: 'サービスのドメインを設定中' }
91
92  # http://rails.hatenadiary.jp/entry/2013/02/06/201302
93  config.logger = Logger.new("log/production.log", 5, 10 * 1024 * 1024)
94end