Net::SSH::AuthenticationFailed: Authentication failed for user - ruby-on-rails

Question

Local Computer Username: Christopher
Ubuntu Server Username: my_app_name
I have followed the Digital Ocean documentation to set up an Ubuntu 16.04 server with Ruby on Rails and is my first time doing so, though when I get to cap production deploy:initial the console returns Net::SSH::AuthenticationFailed: Authentication failed for user Christopher#12.23.34.45 even though I am able to ssh without a problem into my root and user accounts.
I followed these instructions:
How to connect your droplet with Digital Ocean
https://www.digitalocean.com/community/tutorials/how-to-connect-to-your-droplet-with-ssh
Initial Server Setup with Ubuntu 16.04
https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-16-04
I generated an ssh public/private key pair on my local computer using:
ssh-keygen -t rsa
I added the public key from my local computer to the servers ~/.ssh/authorized_keys file. I was then able to ssh into my root and user accounts.
I then followed these instructions:
Deploying a Rails App on Ubuntu 14.04 with Capistrano, Nginx, and Puma
https://www.digitalocean.com/community/tutorials/deploying-a-rails-app-on-ubuntu-14-04-with-capistrano-nginx-and-puma
I generated another ssh key, this time on the server and added the public key to my github's deploy keys list. I was then able to successfully clone my repo through ssh.
I run the following commands:
cat ~/.ssh/id_rsa.pub | ssh -p your_port_num deploy#your_server_ip 'cat >> ~/.ssh/authorized_keys'
cap production deploy:initial
And get back:
Net::SSH::AuthenticationFailed: Authentication failed for user Christopher#12.23.34.45
I would really appreciate any help as this is my very first time deploying to an Ubuntu server and I would really like to learn what it is I'm doing wrong. Thank you in advance.

Answer 1

Did you add your key to the Agent?
What do you see when you run:
$ ssh-add -l
If you get 'The agent has no identities.', then add your key with:
$ ssh-add id_rsa_key_name

Answer 2

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. Same changes fixed the issues for my app https://www.wiki11.com.

Answer 3

You have :
set :ssh_options, { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/id_rsa.pub) }
Change it to:
set :ssh_options, { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/id_rsa) }
Keys should have private key location only. Also, enable ssh-agent on local machine using ssh-add. Add ForwardAgent yes in ~/.ssh/config for your Host.

Answer 4

I had some weird problems as long as I did not use bundler. So using capistrano like so then worked again for me:
# good
bundle exec cap production deploy
Instead of just:
# no good
cap production deploy

Answer 5

You need to add the following line to your config/deploy.rb
ssh_options[:forward_agent] = true
Refer this post.