Hello,
When I do sudo nginx -t, I get told this:
<^>nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful<^>

But, when I do service nginx restart I get:

• Restarting nginx nginx [fail]

But, when I do sudo service nginx restart I get:

• Restarting nginx nginx [ OK ]

Lastly, if I do niginx -t without "sudo" I get:
<^>nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)
2016/04/30 12:11:48 [warn] 16918#0: the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:1
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
2016/04/30 12:11:48 [emerg] 16918#0: open() "/run/nginx.pid" failed (13: Permission denied)
nginx: configuration file /etc/nginx/nginx.conf test failed<^>

Any thoughts?