環境
Ubuntu 16.04
Kuroko2 0.4.6
ruby 2.2.7
rails 5.2.0
問題
http://tracpath.com/works/devops/how-to-install-kuroko2/
上記URLを参考にKuroko2(v0.4.6)の導入を試みていますが、
URLの手順通りにジョブ作成しLaunchで起動するも実行されません。
（ステータスがWORKINGのままで、実行ログに何も表示されない）
execute: ashdfhasdfのような、無意味な文字列で意図的に失敗させるようなスクリプトを記述し、slackに失敗通知を送信させる設定にしても何の反応もありません。
log/development.log
04:35:28 rails.1 | Started GET "/definitions/3/instances/10/logs" for 150.249.198.207 at 2018-
07-27 04:35:28 +0000
04:35:28 rails.1 | Started GET "/definitions/3/instances/10/tokens" for 150.249.198.207 at 2018-07-27 04:35:28 +0000
04:35:28 rails.1 | Started GET "/definitions/3/instances/10/execution_logs" for 150.249.198.207 at 2018-07-27
04:35:28 +0000
04:35:28 rails.1 | Processing by Kuroko2::ExecutionLogsController#index as JSON
04:35:28 rails.1 | Parameters: {"job_definition_id"=>"3", "job_instance_id"=>"10"}
04:35:28 rails.1 | Processing by Kuroko2::TokensController#index as */*
04:35:28 rails.1 | Parameters: {"job_definition_id"=>"3", "job_instance_id"=>"10"}
04:35:28 rails.1 | Processing by Kuroko2::LogsController#index as */*
04:35:28 rails.1 | Parameters: {"job_definition_id"=>"3", "job_instance_id"=>"10"}
04:35:28 rails.1 | Kuroko2::User Load (2.0ms) SELECT `kuroko2_users`.* FROM `kuroko2_users` WHERE `kuroko2_users`.`suspended_at` IS NULL AND `kuroko2_users`.`id` = 1 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::User Load (0.7ms) SELECT `kuroko2_users`.* FROM `kuroko2_users` WHERE `kuroko2_users`.`suspended_at` IS NULL AND `kuroko2_users`.`id` = 1 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::User Load (4.5ms) SELECT `kuroko2_users`.* FROM `kuroko2_users` WHERE `kuroko2_users`.`suspended_at` IS NULL AND `kuroko2_users`.`id` = 1 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::JobDefinition Load (1.6ms) SELECT `kuroko2_job_definitions`.* FROM `kuroko2_job_definitions` WHERE `kuroko2_job_definitions`.`id` = 3 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::JobDefinition Load (0.8ms) SELECT `kuroko2_job_definitions`.* FROM `kuroko2_job_definitions` WHERE `kuroko2_job_definitions`.`id` = 3 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-
5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::JobDefinition Load (3.1ms) SELECT `kuroko2_job_definitions`.* FROM `kuroko2_job_definitions` WHERE `kuroko2_job_definitions`.`id` = 3 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::JobInstance Load (0.2ms) SELECT `kuroko2_job_instances`.* FROM `kuroko2_job_instances` WHERE `kuroko2_job_instances`.`id` = 10 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::JobInstance Load (2.9ms) SELECT `kuroko2_job_instances`.* FROM `kuroko2_job_instances` WHERE `kuroko2_job_instances`.`id` = 10 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-
5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::JobInstance Load (1.4ms) SELECT `kuroko2_job_instances`.* FROM `kuroko2_job_instances` WHERE `kuroko2_job_instances`.`id` = 10 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-
5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Completed 404 Not Found in 28ms (ActiveRecord: 6.7ms)
04:35:28 rails.1 |
04:35:28 rails.1 |
04:35:28 rails.1 | Kuroko2::Log Load (3.8ms) SELECT `kuroko2_logs`.* FROM `kuroko2_logs` WHERE `kuroko2_logs`.`job_instance_id` = 10 ORDER BY `kuroko2_logs`.`id` ASC
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Completed 200 OK in 28ms (Views: 0.3ms | ActiveRecord: 9.0ms)
04:35:28 rails.1 |
04:35:28 rails.1 |
04:35:28 rails.1 | Rendering /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/kuroko2-0.4.6/app/views/kuroko2/tokens/index.html.slim
04:35:28 rails.1 | Kuroko2::Token Load (0.5ms) SELECT `kuroko2_tokens`.* FROM `kuroko2_tokens` WHERE `kuroko2_tokens`.`job_instance_id` = 10
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | (0.4ms) SELECT COUNT(*) FROM `kuroko2_tokens` WHERE `kuroko2_tokens`.`parent_id` = 8
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Kuroko2::Execution Load (0.3ms) SELECT `kuroko2_executions`.* FROM `kuroko2_executions` WHERE `kuroko2_executions`.`token_id` = 8 LIMIT 1
04:35:28 rails.1 | ? /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
04:35:28 rails.1 | Rendered /home/kuroko/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/kuroko2-0.4.6/app/views/kuroko2/tokens/index.html.slim (181.0ms)
04:35:28 rails.1 | Completed 200 OK in 213ms (Views: 200.1ms | ActiveRecord: 6.6ms)
上記のログを繰り返し吐き続けていますが、railsの知識が乏しいこともあり解決に至っておりません。
どなたか原因等わかる方いらっしゃいましたら、お力添えいただきたく存じます。