WordPress, Docker and nginx
Try the following:
server { listen 80; server_name sub.domain.com; location / { proxy_pass http://127.0.0.1:8081; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; }}localhost may not necessarily resolve to 127.0.0.1 which is where your Docker container is listening.
Make sure you can get to port 8081 from your machine. Run:
$ telnet 127.0.0.1 8081Trying 127.0.0.1...Connected to localhost.Escape character is '^]'.