sudo apt-get install runit

cd /etc/sv/ mkdir sidekiq cd sidekiq

nano run

#!/bin/sh
cd /home/deployer/application/current/
exec 2>&1
exec chpst -udeployer bundle exec sidekiq -e production -P /home/deployer/application/current/tmp/pids/sidekiq.pid -L /home/qeployer/application/current/log/sidekiq.log

/etc/sv/sidekiq# chmod 755 run

ln -s /etc/sv/sidekiq /etc/service/sidekiq sudo reboot

cd /etc/sv/sidekiq/
chmod 755 supervise/
chown deployer ./supervise/ok ./supervise/control ./supervise/status

Check status:

sv status sidekiq 
sv check sidekiq

Runit Log can be checked at:

/var/log/upstart/runsvdir.log

More details at http://smarden.org/runit/faq.html#user