Linux学习笔记之时间同步the NTP socket is in use, exiting问题

[root@app1 ~]# ntpdate ntp.api.bz
17 Apr 14:39:09 ntpdate[24744]: the NTP socket is in use, exiting

[root@app1 ~]# service ntpd stop
Shutting down ntpd:                                        [  OK  ]

[root@app1 ~]# ntpdate ntp.api.bz
17 Apr 15:22:43 ntpdate[25723]: step time server 252.27.13.2 offset 2312.3819939 sec