[RUBY] [Beginner] When rails s doesn't work

If you type rails s

Address already in use - bind(2) for 127.0.0.1:3000 (Errno::EADDRINUSE)

Sometimes the local server didn't work. This means that I have used No. 3000 elsewhere, so I will not be able to start up, so I will cut it.

manner

Check the ID of the process running on port 3000.

＄　lsof -i :3000

COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
ruby    24301 ubuntu    6u  IPv4 161869      0t0  TCP *:3000 (LISTEN)

It comes out like this.

In this case

＄　kill -9 24301

You can stop the process if you do, so try rails s again.

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