Ssh authentication error while deploying using capistrano

Question

I am trying to deploy my rails application ( Ruby 2.1.2 and Rails 4.1.4 ) through capistrano from mac. I have ssh keys set up on server. But i keep getting authentication error whenever i try to deploy. The error is:

SSHKit::Runner::ExecuteError: Exception while executing on host xxx.xxx: Authentication failed for user deploy@xxx.xxx

followed by:

Net::SSH::AuthenticationFailed: Authentication failed for user deploy@xxx.xx

This is my staging.rb:

server "xxx.xx.xxx", user: "deploy", roles: %w{web app db}
set :ssh_options, {
  user: "root",
  forward_agent: false,
  keys: '~/.ssh/id_rsa',
  auth_methods: %w(publickey password)
}
set :branch, "master"
set :rails_env,   "staging"

I am able to login to server via terminal using ssh root@xxx.xx but cannot login with capistrano. Any help or advice will be appericiated.

Answer 1

At first. You use two different users in one config. Choice one and edit your staging.rb

Also I am not sure that using public key is a good way. Try to add private key for user Deploy. Then if you able to login as deploy

ssh -i id_rsa deploy@xxx.xx.xx.xx

try to update gem net-ssh to version 3.0.1. Then you can write your config like

set :ssh_options, {
  user: "deploy",      
  keys: ["~/.ssh/id_rsa"]      
} 

Answer 2

I have faced the same issue for my application https://www.wiki11.com .

Those who are getting error

Net::SSH::AuthenticationFailed: Authentication failed for user deploy@XXX.XX.XX.XXX

Here is the solution ,

First of all you need to ssh to your server and run

eval `ssh-agent`

and then

ssh-add ~/.ssh/id_rsa

and now change

set :ssh_options, { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/id_rsa.pub) } 
#...

to

set :ssh_options, { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/id_rsa) }
#...

I just removed pub from id_rsa.pub .

And then run

cap production deploy:initial

It should work now.