I decided to follow the Multiple Blogs Tutorial to set up a second ghost instance on a droplet. Already had a second nginx config file set up to run a second domain and was testing that site. Shut down both ghost and nginx with ‘service ghost stop’ and 'service nginx stop’. No error messages seen.

Modified the second nginx config file in sites-enabled and attempted to restart nginx with 'service nginx restart’. Saw 'Job for nginx.service failed because the control process exited with error code. See “systemctl status nginx.service” and “journalctl -xe” for details.’

The error log shows:

2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to [::]:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:443 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to [::]:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:443 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to [::]:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:443 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to [::]:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:443 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to [::]:80 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: bind() to 0.0.0.0:443 failed (98: Address already in use)
2017/09/15 04:09:48 [emerg] 24518#24518: still could not bind()

Attempted to revert back to previous config file. Still fails. Ran 'nginx -t’ and saw no syntax errors. Ran 'ps -aux’ and see:

root@ghost-1gb-sfo2-01:/etc/nginx/sites-enabled# ps -aux | grep nginx
root     24899  0.0  0.0  12948   940 pts/0    S+   04:34   0:00 grep --color=auto nginx
root     31045  0.0  0.3 126944  3452 ?        Ss   Sep02   0:00 nginx: master process nginx -c /etc/nginx/nginx.conf
www-data 31053  0.0  0.5 127096  6072 ?        S    Sep02   0:11 nginx: worker process

What’s going on here? Shouldn’t the 'service nginx stop’ have killed all the processes? Is that what is causing the restart to fail?