docker-nginx を vagrant（centos 7）上で動かしたが、mac（ローカルマシン）から接続できず苦戦した話 ref: http://qiita.com/varmil/items/3a93709d935ed2d710d5

file0.txt

  nginx:
    image: nginx:1.10.2-alpine
    volumes:
     - ./nginx/nginx.conf:/etc/nginx/nginx.conf
     - ./nginx/mynginx.cnf:/etc/nginx/conf.d/mysite.template
    ports:
     - "8080:80"
    environment:
     - NGINX_HOST=127.0.0.1
     - NGINX_PORT=80
     .....
    command: /bin/sh -c "envsubst < /etc/nginx/conf.d/mysite.template > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'"

file1.txt

upstream backend {
    server ${NGINX_HOST_SERVER}:1337;
}

server {
    listen ${NGINX_PORT};
    server_name ${NGINX_HOST};

    location ~ .*\.(jpg|gif|png|css|js|inc|ico) {
        expires 30d;
        root  ${NGINX_WEB_ROOT};
    }

    location / {
        add_header Access-Control-Allow-Origin '*';
        add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
        add_header Access-Control-Allow-Headers 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
        add_header Access-Control-Allow-Credentials true;

        expires modified +10m;
        proxy_pass  http://backend;
        break;
    }
}

file2.txt

vagrant:~ $ sudo sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1