Rails：Capistrano。 被拒绝（公钥）

Question

I've been looking at a way to deploy my app using capistrano. I currently am hosting a small private repo on github and a local server to try deploying my test. I come upon a problem and an error message below.

I have done the following

1. Generate an ssh key on server and added it sucessfully to deploy keys in repo and tested(git@github.com)

2. Generate an ssh key on client and add it sucessfully to deploy keys in repo

3. setup a private repository. And have account deployer with rights to deploy

4. configed deploy.rb and production rb to follow mimic many other templates out there.

I still cannnot figure why it is giving me an error like this

    DEBUG [a5554d3d] Command: /usr/bin/env chmod +x /tmp/App/git-ssh.sh
    INFO [a5554d3d] Finished in 0.020 seconds with exit status 0 (successful).
    INFO [b1517df1] Running /usr/bin/env git ls-remote --heads git@github.com:aceofw
    ings/App.git as deploy@192.168.1.84
    DEBUG [b1517df1] Command: ( GIT_ASKPASS=/bin/echo GIT_SSH=/tmp/App/git-ssh
    .sh /usr/bin/env git ls-remote --heads git@github.com:aceofwings/App.git )

    DEBUG [b1517df1]        Permission denied (publickey).
    DEBUG [b1517df1]        fatal: Could not read from remote repository.
    DEBUG [b1517df1]
    DEBUG [b1517df1]        Please make sure you have the correct access rights
    DEBUG [b1517df1]        and the repository exists.
    (Backtrace restricted to imported tasks)
    cap aborted!
    SSHKit::Runner::ExecuteError: Exception while executing as deploy@192.168.1.84:
    git exit status: 128
    git stdout: Nothing written
    git stderr: Permission denied (publickey).
    fatal: Could not read from remote repository.

    Please make sure you have the correct access rights
    and the repository exists.

    SSHKit::Command::Failed: git exit status: 128
    git stdout: Nothing written

The Deploy.rb file

   ###############Deploy.rb##################
# config valid only for current version of Capistrano
lock '3.4.0'

set :repo_url, 'git@github.com:aceofwings/App.git'
set :application, 'App'
set :user, 'deploy'
#set :pty, true
# Default branch is :master
# ask :branch, `git rev-parse --abbrev-ref HEAD`.chomp



# Default value for linked_dirs is []
# set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bundle', 'public/system')


namespace :deploy do

  after :restart, :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      # Here we can do anything such as:
      # within release_path do
      #   execute :rake, 'cache:clear'
      # end
    end
  end

end

Production.rb

server '192.168.1.84', user: 'deploy', roles: %w{app db web}

#set :stage, :production
 role :app, %w{deploy@192.168.1.84}
 role :web, %w{deploy@192.168.1.84}
 role :db,  %w{deploy@192.168.1.84}


  set :ssh_options, {
    forward_agent: false,
    auth_methods: %w(password),
    password: 'Deploy4Real',
    user: 'deploy'
  }

Answer 1

I had a similar problem. It turns out that the SSH agent was not running. I found this out looking at the Capistrano documentation: http://capistranorb.com/documentation/getting-started/authentication-and-authorisation/

Running this command:

$ ssh-add -l

showed me that my public key was not added to the agent so I had to add it:

$ ssh-add

Identity added: /Users/me/.ssh/id_rsa (/Users/me/.ssh/id_rsa)

After this my Capistrano deployment worked.

Answer 2

You should set in production.rb:

forward_agent: true

I was having the same problem with Capistrano 3.4. With Capistrano 3.2.1 it seemed to ignore this parameter.

You can use capistrano-ssh-doctor to troubleshoot possible config problems.

Answer 3

I think your capistrano may have some old files in its git cache, probably from renaming the repository or something like that. Try to delete the cached-copy folder in the shared folder on the server, so capistrano will pull your repo again.