docker nginx运行后无法访问如何解决

# include /etc/nginx/conf.d/.conf;
include /etc/nginx/sites-available/;

user nginx;
worker_processes 1;

error_log /var/log/nginx/error.log warn;
pid    /var/run/nginx.pid;


events {
  worker_connections 1024;
}


http {
  include    /etc/nginx/mime.types;
  default_type application/octet-stream;

  log_format main '$remote_addr - $remote_user [$time_local] "$request" '
           '$status $body_bytes_sent "$http_referer" '
           '"$http_user_agent" "$http_x_forwarded_for"';

  access_log /var/log/nginx/access.log main;

  sendfile    on;
  #tcp_nopush   on;

  keepalive_timeout 65;

  #gzip on;

  include /etc/nginx/conf.d/*.conf;
}

version: '3'
services:
 nginx-proxy:
  image: nginx
  container_name: nginx
  ports:
   - 8081:80
  volumes:
   - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro

docker exec -it nginx /bin/bash

-./nginx/sites-available:/etc/nginx/sites-available:ro

/etc/nginx/sites-available# ls
default.conf