19강 (Service&Daemons)

서비스, 앱을 시작하면 프로세스가 만들어짐
그 과정에서 background에 Daemon이 만들어짐

1️⃣ 서비스 명령어

systemctl : systemd utility that is responsible for controlling the sysremd system and service manager 
           (systemd 시스템 및 서비스 관리자 제어)


check if systemd installed in your system
-> systemctl --version

check if systemd is running
-> ps -ef | grep system

check all running services
-> systemctl --all

to check the status, start, stop and restart a service
-> systemctl status|start|stop|restart application.service

to reload the configuration of a service
-> systemctl reload application.service

to enable or disable a service at boot time
-> systemcyl enable|disable application.service

to enavle or disable a service completely (at boot or manually)
-> systemctl mask|unmask application.service

rpm -qa | wc -l
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