flask部署中Nginx的问题

Nginx 的配置：

123456789101112131415161718server { listen 80; server_name 23.145.145.241（vps的ip，我随便写的）;charset    utf-8;access_log    /var/log/nginx/mysite.access.log    main;error_log    /var/log/nginx/mysite.error.log    warn;location / {    root    /var/www/mysite;    index    index.html index.htm;    include uwsgi_params;    uwsgi_pass    127.0.0.1:5000;    uwsgi_param UWSGI_PYHOME    /var/www/mysite_venv;    uwsgi_param UWSGI_CHDIR    /var/www/mysite;    uwsgi_param PYTHONPATH    /var/www/mystie;    uwsgi_param UWSGI_MODULE    run;    uwsgi_param UWSGI_CALLABLE app;}}

地址栏输入ip, 访问成功！

问题是：把上面的server_name换成域名，其他不变，再访问就提示“If you see this page, the nginx web server is successfully installed and working. Further configuration is required.”域名：阿里云买的vps：搬瓦工这该怎么解决呀？