[root@centos7 /usr/local/nginx/sbin]# ./nginx -V
Tengine version: Tengine/2.3.3
nginx version: nginx/1.18.0
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC)
built with OpenSSL 1.0.2k-fips 26 Jan 2017
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx --with-stream --add-module=modules/ngx_http_upstream_dynamic_module --add-module=modules/ngx_http_upstream_vnswrr_module

upstream tcp_servers_3306 {
dynamic_resolve fallback=stale fail_timeout=30s;
server m1.qingsuan-bvt-base01.bus:3306;
}

server {
   error_log       /usr/local/nginx/logs/3306_error.log;
   access_log      /usr/local/nginx/logs/3306_access.log proxy;
   listen 3306;
   proxy_connect_timeout 5s;
   proxy_timeout 20s;
   proxy_pass tcp_servers_3306;
}