This was a tricky one. I'm building a tool to spin up new Drupal instances, built on docker, using a distro. I ran everything and the nginx container was running but using this command I could see nothing running on port 80, and nothing loaded in the browser.
netstat -tulpn
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.11:44351 0.0.0.0:* LISTEN -
udp 0 0 127.0.0.11:59921 0.0.0.0:* -
Solved this, there was no conf file in the /etc/nginx/conf.d, you need at least one or nginx will not run. Added one, and it came back.
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1/nginx: master pro
tcp 0 0 127.0.0.11:42681 0.0.0.0:* LISTEN -
udp 0 0 127.0.0.11:58003 0.0.0.0:* -