killed process. but still work the process on ubuntu

run node server using pm2

node server process must be killed

kill -9 PID

netstat -tulpn

But process again run on 4000 port

We need to root service using ps

ps auxf

pm2 run node server on ubuntu account

so although node process was killed, pm2 execute node server again.

we kill pm2 process

kill -9 PID
netstate -tulpn