Made Capistrano use Puma tasks.

Capfile

@@ -11,10 +11,14 @@ require 'capistrano/rails/migrations'
 
 namespace :deploy do
   desc 'Start application'
-  task(:start) {}
+  task(:start) {
+    invoke 'puma:start'
+  }
 
   desc 'Stop application'
-  task(:stop) {}
+  task(:stop) {
+    invoke 'puma:stop'
+  }
 end
 
 # Load custom tasks from `lib/capistrano/tasks' if you have any defined

lib/capistrano/tasks/unicorn.rake

@@ -1,40 +0,0 @@
-namespace :deploy do
-  after :start, :start_unicorn do
-    invoke 'unicorn:start'
-  end
-
-  after :stop, :stop_unicorn do
-    invoke 'unicorn:stop'
-  end
-
-  after :restart, :restart_unicorn do
-    begin
-      invoke "unicorn:restart"
-    rescue SSHKit::Runner::ExecuteError
-      invoke "unicorn:start"
-    end
-  end
-end
-
-namespace :unicorn do
-  desc "Start Unicorn"
-  task :start do
-    on roles(:web) do
-      execute :sudo, :start, "unicorn"
-    end
-  end
-
-  desc "Stop Unicorn"
-  task :stop do
-    on roles(:web) do
-      execute :sudo, :stop, "unicorn"
-    end
-  end
-
-  desc "Restart Unicorn"
-  task :restart do
-    on roles(:web), in: :sequence, wait: 5 do
-      execute :sudo, :restart, "unicorn"
-    end
-  end
-end