Your comments

I have a similar situation.

Regarding settings with Puma
1. Was installed package ajenti-v-ruby-puma (This has been verified on Ubuntu 14.04.1(2) and Debian 7.8)
2. Gemfile -> gem 'puma' 
3. bundle install


In this case there are no settings in the panel about Puma:
1. Is There

2. And here



Regarding settings with Unicorn:

With the installation is no problem, but I get the following 502 error  when trying to enter the site -

Could you help with the solution of these problems?