How to enter rails console on production via capistrano?

Question

I want to enter the rails console on production server from my local machine via capistrano. I found some gists, e.g. https://gist.github.com/813291 and when I enter console via

cap production console 

I get the following result

192-168-0-100:foldername username $ cap console RAILS_ENV=production
  * executing `console'
  * executing "cd /var/www/myapp/current && rails console production"
    servers: ["www.example.de"]
    [www.example.de] executing command
    [www.example.de] rvm_path=$HOME/.rvm/ $HOME/.rvm/bin/rvm-shell '1.9.3' -c 'cd /var/www/myapp/current && rails console production'
/var/www/myapp/releases/20120305102218/app/controllers/users_controller.rb:3: warning: already initialized constant VERIFY_PEER
Loading production environment (Rails 3.2.1)
Switch to inspect mode.

and thats it... Now I can enter some text, but nothing happens...

Has anybody an idea how to get that work or another solution for my problem?

Answer 1

I've added my own tasks for this kind of thing:

namespace :rails do   desc "Remote console"   task :console, :roles => :app do     run_interactively "bundle exec rails console #{rails_env}"   end    desc "Remote dbconsole"   task :dbconsole, :roles => :app do     run_interactively "bundle exec rails dbconsole #{rails_env}"   end end  def run_interactively(command)   server ||= find_servers_for_task(current_task).first   exec %Q(ssh #{user}@#{myproductionhost} -t '#{command}') end 

I now say cap rails:console and get a console.

Answer 2

For Capistrano 3 you can add these lines in your config/deploy:

namespace :rails do   desc 'Open a rails console `cap [staging] rails:console [server_index default: 0]`'   task :console do         server = roles(:app)[ARGV[2].to_i]      puts "Opening a console on: #{server.hostname}...."      cmd = "ssh #{server.user}@#{server.hostname} -t 'cd #{fetch(:deploy_to)}/current && RAILS_ENV=#{fetch(:rails_env)} bundle exec rails console'"      puts cmd      exec cmd   end end 

To open the first server in the servers list:

cap [staging] rails:console  

To open the second server in the servers list:

cap [staging] rails:console 1  

Reference: Opening a Rails console with Capistrano 3

exec is needed to replace the current process, otherwise you will not be able to interact with the rails console.

Answer 3

A simple Capistrano 3 solution may be:

namespace :rails do
  desc "Run the console on a remote server."
  task :console do
    on roles(:app) do |h|
      execute_interactively "RAILS_ENV=#{fetch(:rails_env)} bundle exec rails console", h.user
    end
  end

  def execute_interactively(command, user)
    info "Connecting with #{user}@#{host}"
    cmd = "ssh #{user}@#{host} -p 22 -t 'cd #{fetch(:deploy_to)}/current && #{command}'"
    exec cmd
  end
end

Then you can call it say, on staging, with: cap staging rails:console. Have fun!

Answer 4

For Capistrano > 3.5 and rbenv. Working in 2021

namespace :rails do
  desc "Open the rails console on one of the remote servers"
  task :console do |current_task|
    on roles(:app) do |server|
      server ||= find_servers_for_task(current_task).first
      exec %Q[ssh -l #{server.user||fetch(:user)} #{server.hostname} -p #{server.port || 22} -t 'export PATH="$HOME/.rbenv/bin:$PATH"; eval "$(rbenv init -)"; cd #{release_path}; bin/rails console -e production']
    end
  end
end