Error in Capistrano deployment in localhost - ruby-on-rails-4

Question

I am deploying my application on localhost using capistrano , but getting the below error:
INFO [5f197b14] Running /usr/bin/env mkdir -p /tmp/promo_app/ as chakreshwar#localhost
DEBUG [5f197b14] Command: /usr/bin/env mkdir -p /tmp/promo_app/
(Backtrace restricted to imported tasks)
cap aborted!
Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:22
I am using the below gem for capistrano
gem 'capistrano'
gem 'capistrano-ext'
Below is the code of Deploy.rb
# config valid only for current version of Capistrano
lock '3.4.0'
set :application, 'my_app'
set :repo_url, '/home/test/git_server/test_app.git'
set :deploy_to, '/home/test/projects/capistrano_deployment/my_app'
set :scm, :git
set :format, :pretty
# Default value for :pty is false
set :pty, true
set :default_stage, "staging"
namespace :deploy do
after :restart, :clear_cache do
on roles(:web), in: :groups, limit: 3, wait: 10 do
end
end
end
Below is my staging.rb:
server 'localhost', user: 'username', roles: %w{app db web}#
:other_value
role :app, %w{localhost}#, my_property: :my_value
role :web, %w{localhost}#, other_property: :other_value
role :db, %w{localhost}
Please tell if anything missed in it .

Answer 1

The error indicates that you cannot SSH to the destination box, in this case localhost. Try ssh 127.0.0.1, and make sure that works. The deployment should execute once that works.
In regards to your general config, a couple of notes:
The capistrano-ext gem is obsolete, you can remove that.
In staging.rb, you have duplicate directives. You should probably remove the lines beginning with role in favor of the line beginning with server.
In staging.rb, make sure that username: is set to the SSH user with which you will log in.
Good luck!

Answer 2

Maybe you're missing an SSH server to connect on your on machine because you only have the client.
If you can't do ssh 127.0.0.1, use:
sudo apt-get install openssh-server
To install the ssh server