Capistrano 3 useful tasks to open ssh session and rails console

rails.rake

namespace :rails do
  desc 'Open a rails console `cap [staging] rails:console [server_index default: 0]`'
  task :console do
    on roles(:app) do |server|
      return if server != roles(:app)[ARGV[2].to_i]
      puts "Opening a console on: #{host}...."

      cmd = "ssh #{fetch(:ssh_options)[:user]}@#{host} -t 'source \"$HOME/.rvm/scripts/rvm\""\
      " && cd #{fetch(:deploy_to)}/current && RAILS_ENV=#{fetch(:rails_env)} bundle exec rails console'"

      exec cmd
    end
  end
end

# Bonus
desc 'Open ssh `cap [staging] ssh [server_index default: 0]`'
task :ssh do
  on roles(:app) do |server|
    return if server != roles(:app)[ARGV[2].to_i]
    puts "Opening ssh session on: #{host}...."

    cmd = "ssh #{fetch(:ssh_options)[:user]}@#{host}"
    exec cmd
  end
end