What to do if rails s doesn't work

After starting the server with rails s, if you exit the terminal without exiting with Ctrl + C, the following error will occur at the next startup.

$ rails s
=> Booting Puma
=> Rails 5.0.4 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
A server is already running.Check project name/tmp/pids/server.pid.
Exiting

Workaround

$ lsof -ni tcp:3000
COMMAND   PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
ruby    77464 d0ne1s   20u  IPv4 0xe8bde147dfa7a793      0t0  TCP 127.0.0.1:hbci (LISTEN)
ruby    77464 d0ne1s   22u  IPv6 0xe8bde147d9f527d3      0t0  TCP [::1]:hbci (LISTEN)

$ kill -9 77464

lsof: Command to list open files -n: Display the IP address (does not resolve the name) -i: Specify the port number and protocol

kill: kill the process -9: Forced termination

reference

When Rails s process doesn't break [Lsof] command-list open files

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