nginx四层代理日志配置

配置在stream段：

1.  
   log_format proxy '$remote_addr [$time_local]'
2.  
   '$protocol $status $bytes_sent $bytes_received'
3.  
   '$session_time "$upstream_addr" '
4.  
   '"$upstream_bytes_sent" "$upstream_bytes_received" "$upstream_connect_time"';
5.  
   access_log /var/log/nginx/tcp-access.log proxy ;
6.  
   error_log /var/log/nginx/tcp-error.log warn ;