linux basic commands - kill the process

• Demand: Docker-Registry always reboot, then there is a look at port 5000 did not kill the process, but can not find the thread in the end is which.
• Solution:
  enter the administrator privileges
  to use root kill

[root@ldy ~]$ netstat -anp  | grep 5000
tcp6       0      0 :::50000                :::*                    LISTEN      4018/docker-proxy   
[root@ldy ~]$ kill -9 4018

Very sorry, you should also try ps