move newrelic + deploytags gem to production env, rename cap tasks to .rake

lib/capistrano/tasks/delayed_job.rake

@@ -0,0 +1,51 @@
+namespace :delayed_job do
+  desc "Start delayed_job process"
+  task :start do
+    on roles(:app) do
+      if test("[ -d #{current_path} ]")
+        within current_path do
+          with rails_env: fetch(:rails_env) do
+            hostname = capture("hostname").strip
+            execute :bundle, "exec", "script/delayed_job", "--queues=default,#{hostname}", "-n 2", "start"
+          end
+        end
+      end
+    end
+  end
+
+  desc "Stop delayed_job process"
+  task :stop do
+    on roles(:app) do
+      if test("[ -d #{current_path} ]")
+        within current_path do
+          with rails_env: fetch(:rails_env) do
+            execute :bundle, "exec", "script/delayed_job", "stop"
+          end
+        end
+      end
+    end
+  end
+
+  desc "Restart delayed_job process"
+  task :restart do
+    on roles(:app) do
+      find_and_execute_task("delayed_job:stop")
+      find_and_execute_task("delayed_job:start")
+    end
+  end
+
+  desc "Kill delayed_job process"
+  task :kill do
+    on roles(:app) do
+      procs = capture("ps -A -o pid,command").split(/\r\n|\r|\n/).grep(/delayed_job/).map(&:to_i)
+
+      if procs.any?
+        execute "for i in #{procs.join(' ')} ; do kill -s TERM $i ; done"
+      end
+    end
+  end
+end
+
+after "delayed_job:stop", "delayed_job:kill"
+before "deploy:started", "delayed_job:stop"
+after "deploy:published", "delayed_job:start"