서버를 시작할 때 'A server is alreadyrunning.' 오류 처리

이벤트

$ bundle exec rails s
=> Booting Puma
=> Rails 6.0.3.4 application starting in development 
=> Run `rails server --help` for more startup options
A server is already running. Check /home/masa/environment/RailsTutorial/sample_app2/tmp/pids/server.pid.
Exiting

처리하다.

$ cat /home/masa/environment/RailsTutorial/sample_app2/tmp/pids/server.pid
895

$ lsof -i:3000
COMMAND PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
ruby    895 masa   13u  IPv4  19793      0t0  TCP localhost:3000 (LISTEN)
ruby    895 masa   14u  IPv6  19794      0t0  TCP ip6-localhost:3000 (LISTEN)

$ kill 895

$ ls /home/masa/environment/RailsTutorial/sample_app2/tmp/pids/server.pid
ls: cannot access '/home/masa/environment/RailsTutorial/sample_app2/tmp/pids/server.pid': No such file or directory

$ rails s