环境情况及具体表现：CentOS7 x86_64，nginx 1.15.0，启动nginx时有下列提示，但测试也可通过，服务能正常启动，也能访问。
[root@iz2ze6jjhwn5m83ygo2yo6z vhost]# /usr/local/nginx/sbin/nginx -t -c /usr/local/nginx/conf/nginx.conf
nginx: [warn] the “ssl” directive is deprecated, use the “listen … ssl” directive instead in /usr/local/nginx/conf/vhost/web.conf:4
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
据查资料，这是nginx在1.15.0之后，ssl站点无需再写ssl on参数，将此参数注释后即可，该问题初次遇到，正在观察是否有其它问题。