Restart / Reload Nginx without Entering Sudo Password

nginx.overrides

# Enter this command to create a sudoers override/include file:
# sudo visudo -f /etc/sudoers.d/nginx.overrides

# (Make sure you actually have this in your /etc/sudoers - Run `sudo visudo` to check)
# #includedir /etc/sudoers.d

# This file assumes your deployment user is `deploy`

# Nginx Commands
Cmnd_Alias NGINX_RESTART = /usr/sbin/service nginx restart
Cmnd_Alias NGINX_RELOAD  = /usr/sbin/service nginx reload

# No-Password Commands
deploy ALL=NOPASSWD: NGINX_RESTART, NGINX_RELOAD

Note that, at least on my system (Ubuntu 16.04), this filename cannot contain a . character!! From the sudoers manual:

sudo will read each file in /etc/sudoers.d, skipping file names that end in ‘~’ or contain a ‘.’ character

In other words, you can instead run a command such as sudo visudo -f /etc/sudoers.d/nginx_overrides to generate this file.

In addition, here is a more generic version of the file that you may wish to use instead:

deploy ALL=(ALL:ALL) NOPASSWD: /usr/sbin/service nginx *

It never said how to run this.
I spent 1 hour to understand that you need explicitly specify sudo command even if you added user to sudoers.

/usr/sbin/service nginx reload => will prompt to enter password
sudo /usr/sbin/service nginx reload => will reload nginx without any password prompt

this should be run only after nginx overrides file created.

It's the best configuration, it took me a little while to find something that works, but that's exactly what I needed. Thank you very much, and thank you also for the capistrano task ;-)