4. 이제 Chrony 서비스를 시작합니다. 이때 운영체제가 재부팅되어도 자동으로 서비스를 실행할 수 있도록 systemctl enable 명령어를 이용해 활성화합니다. 서비스가 시작되면 정상적으로 실행되는지 status를 확인합니다.

[root@controller ~]# systemctl enable chronyd.service
[root@controller ~]# systemctl start chronyd.service
[root@controller ~]# systemctl status chronyd.service
chronyd.service - NTP client/server
    Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
    Active: active (running) since 금 2016-07-15 19:05:13 KST; 15h ago
   Process: 4336 ExecStartPost=/usr/libexec/chrony-helper update-daemon
(code=exited, status=0/SUCCESS)
   Process: 4332 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/
SUCCESS)
  Main PID: 4334 (chronyd)
    CGroup: /system.slice/chronyd.service
            └─4334 /usr/sbin/chronyd

7월 15 19:05:13 controller chronyd[4334]: chronyd version 2.1.1 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +DEBUG +ASYNCDNS +IPV6 +SECHASH) 7월 15 19:05:13 controller chronyd[4334]: Generated key 1 7월 15 19:05:13 controller systemd[1]: Started NTP client/server. 7월 15 19:05:18 controller chronyd[4334]: Selected source 211.233.40.78 7월 15 19:05:18 controller chronyd[4334]: System clock wrong by 56297.955953 seconds, adjustment started 7월 16 10:43:36 controller chronyd[4334]: System clock was stepped by 56297.955953 seconds