unable to start mongodb local server

Recently I explore mongoDB document database using multinode cluster, somehow, after I turn off the machine, I got the following errors

Address already in use for socket: 0.0.0.0:27017

I found some related articles, this and that, and the following answer by Sacha is work for me,

In this case, type the following command

ps wuax | grep mongo

You should see something that looks like this

User           31936   0.5 0.4 2719784 35624   ?? S     7:34pm   0:09.98 mongod
User           31945   0.0 0.0 2423368   184 s000 R+   8:24pm   0:00.00 grep mongo

Now enter the kill command for the mongod instance (31936 in this case):

kill 31936