Rails: Queue Classic with Capistrano - queue

Question

I want to start Queue Classic (QC) within my Capistrano recipe:
namespace :queue_classic do
desc "Start QC worker"
task :start, roles: :web do
run "cd #{release_path} && RAILS_ENV=production bundle exec rake qc:work"
end
after "deploy:restart", "queue_classic:restart"
end
Capistrano runs the line correctly, so that the QC worker starts, but not as a daemon. As a result Capistrano won't continue to run the recipes.
How can I start the QC worker in the background and let Capistrano finish its tasks?
Thank you!

Answer 1

I use foreman for this:
after "deploy:update", "foreman:export" # Export foreman scripts
after "deploy:restart", "foreman:restart" # Restart application scripts
after "deploy:stop", "foreman:stop" # Restart application scripts
after "deploy:start", "foreman:start"
# Foreman tasks
desc 'Export the Procfile to Ubuntu upstart scripts'
task :export, :roles => :queue do
run "cd #{release_path}; #{sudo} $(rbenv which foreman) export upstart /etc/init -f ./Procfile -a #{application} -u #{user} -l #{release_path}/log/foreman"
end
desc "Start the application services"
task :start, :roles => :queue do
run "#{sudo} start #{application}"
end
desc "Stop the application services"
task :stop, :roles => :queue do
run "#{sudo} stop #{application}"
end
desc "Restart the application services"
task :restart, :roles => :queue do
run "#{sudo} stop #{application}"
run "#{sudo} start #{application}"
#run "sudo start #{application} || sudo restart #{application}"
end
Then in your Procfile put something like
worker: RAILS_ENV=production bundle exec rake qc:work

Answer 2

Use the & sign at the and and put process in background.
run "cd #{release_path} && RAILS_ENV=production bundle exec rake qc:work &"
Killin and restarting is than a bit tricky, but it could be done using ps, grep and kill.