puma unix

capistrano

set :puma_bind,       "unix://#{shared_path}/tmp/sockets/#{fetch(:application)}-puma.sock"
set :puma_state,      "#{shared_path}/tmp/pids/puma.state"
set :puma_pid,        "#{shared_path}/tmp/pids/puma.pid"
set :puma_access_log, "#{release_path}/log/puma.error.log"
set :puma_error_log,  "#{release_path}/log/puma.access.log"

puma.rb

bind 'unix:///home/ubuntu/railstest/shared/tmp/sockets/sp-puma.sock';
workers 1

on_restart do
  puts 'On restart...'
end

sites-available

upstream yourapp {
  server unix:///home/ubuntu/railstest/shared/tmp/sockets/sp-puma.sock;
}