[Solved] Docker: Error response from daemon: driver failed programming external connectivity on endpoint mysq

docker: Error response from daemon: driver failed programming external connectivity on endpoint mysql (3d8d89f260c9258467f589d4d7d0c27e33ab72d732d1115d1eb42d708606edc4):
So far, the container is occupied

# docker ps -a
CONTAINER ID   IMAGE       COMMAND                  CREATED              STATUS    PORTS     NAMES
a57959032cc9   mysql:5.7   "docker-entrypoint.s…"   About a minute ago   Created             mysql
# docker rm a57959032cc9
a57959032cc9

Error starting userland proxy: listen tcp4 0.0.0.0:3306: bind: address already in use.
the following is the occupied port number

# netstat -tanlp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      948/sshd            
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      9217/mysqld         
tcp        0      0 172.18.7.111:39412      100.100.45.106:443      TIME_WAIT   -                   
tcp        0      0 172.18.7.111:22         58.100.92.78:9024       ESTABLISHED 6899/sshd: root@pts

See for yourself which is occupied, and then delete it with kill + port number