获取Docker IP，找到 Docker0 对应的IP
$ ifconfig
结果如下， 172.17.0.1 就是我们要的IP
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:70:c3:4b:fd txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
编辑虚拟主机配置，配置 proxy_pass 即可。这样就可以使用Nginx容器反向代理到宿主机上的服务。
location /
{
proxy_pass http://172.17.0.1:3000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header REMOTE-HOST $remote_addr;
add_header X-Cache $upstream_cache_status;
expires 12h;
}
