How can I get passenger-config restart-app to work? - ruby-on-rails

Question

Rails 4.1 on Ubuntu 14.04 with rbenv and ruby 2.2.1.
Using capistrano with the capistrano-passenger gem, but the restart at the end fails:
INFO [8213c63a] Running /usr/bin/env passenger-config restart-app /home/deployer/my_app --ignore-app-not-running as deployer#mysite.com
DEBUG [8213c63a] Command: passenger-config restart-app
DEBUG [8213c63a] Please pass either an app path prefix or an app group name. See --help for more information.
When I try to run this command at the command line via SSH, I get this:
deployer#host:~/app/shared/config$ passenger-config restart-app
*** ERROR: You are not authorized to query the status for this
What am I doing wrong here?
I'm using Apache, here's the relevant parts of my /etc/apache2/apache2.conf:
LoadModule passenger_module /home/deployer/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/passenger-5.0.5/buildout/apache2/mod_passenger.so
<IfModule mod_passenger.c>
PassengerRoot /home/deployer/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/passenger-5.0.5
PassengerDefaultRuby /home/deployer/.rbenv/versions/2.2.1/bin/ruby
</IfModule>
<VirtualHost *:80>
ServerName mysite.name.com
# !!! Be sure to point DocumentRoot to 'public'!
DocumentRoot /home/deployer/myssite/current/public
<Directory /home/deployer/mysite/current/public>
# This relaxes Apache security settings.
AllowOverride all
# MultiViews must be turned off.
Options -MultiViews
# Uncomment this if you're on Apache >= 2.4:
Require all granted
</Directory>
</VirtualHost>

Answer 1

Here's what got me running, I added this to my conifg/deploy.rb:
set :passenger_restart_with_sudo, true
Ref: https://github.com/capistrano/passenger/
To add password-less sudo access for the deployer user, on the server do:
(you might want to be more specific as to the allowed commands)
sudo tee /etc/sudoers.d/deployer > /dev/null <<'EOF'
deployer ALL=(ALL) NOPASSWD:ALL
EOF
...and in your delpoy.rb, have:
set :user, 'deployer' # Deployment user on remote servers
Note: it should be noted that the Passenger authors are working on a method so that sudo will not be required any longer in the future.

Answer 2

If you don't want to use sudo for restarting application server, simply add to config/deploy.rb:
namespace :deploy do
desc 'Restart application'
task :restart do
on roles(:app), in: :sequence, wait: 5 do
execute :touch, release_path.join('tmp/restart.txt')
end
end
end
For restarting with sudo (Note that it doesn't have any effect on Passenger < 5):
set :passenger_restart_with_sudo, false
If you want to change restarting options, you might override these:
set :passenger_restart_command, 'passenger-config restart-app'
set :passenger_restart_options, -> { "#{deploy_to} --ignore-app-not-running" }