xinetd is an Internet super server replacing the inetd daemon. For inetd, the setting of the service to be provided was done in /etc/intd.conf, but in xinetd, setting of services to be provided using /etc/xinetd.conf and files under /etc/xinetd.d to hold.
/etc/xinetd.conf is the default configuration file of xinetd, and each file under /etc/xinetd.d is a configuration file for each service.
[vagrant@localhost ~]$ sudo cat /etc/xinetd.conf
cat: /etc/xinetd.conf: そのようなファイルやディレクトリはありません
なんじゃーーーーーーーーー