Docker_compose mapping 20-21 _ to port failure docker

 
Version: '2.2' 
Services: 
Container1: 
Restart: always 
Image: fauria/VSFTPD 
Container_name: VSFTPD 
Environment: 
- PASV_ADDRESS=192.168.1.8 
- PASV_MIN_PORT=21100 
- PASV_MAX_PORT=21110 
Ports: 
20-1020: 
21-1021: 
- 21100-21110:21100-21110 
Volumes, 
-./file:/home/VSFTPD

No, 20 and 21 port mapping into a
20-21/TCP, 0.0.0.0:21100-21110 - & gt; 21100-21110/TCP, 0.0.0.0:49156 - & gt; 61220/TCP, 0.0.0.0:49157 - & gt; 61281/TCP
As you can see, more than 20 and 21 port is not successful mapping, the two strange port (61220=1020 * 20 and 60 + 61281=1021 * 60 + 21)
But if you use the

 
Docker run - d - p - p and shall lie - p 21100-21110:21100-21110 - v/Ftpfile:/home/VSFTPD - e PASV_ADDRESS=192.168.1.8 - e PASV_MIN_PORT PASV_MAX_PORT=21110=21100 - e - name VSFTPD - restart=always fauria/VSFTPD

You can run normally,,
Is not only a VSFTPD, I use gitlab, 22 port will appear this situation,
Feel as long as 2 x port mapping will be a problem,,,