Mac OS X NTP service turned on and off

To turn on the NTP service:

If the system stops unexpectedly, the NTP service can be turned on using the following command, and then using NETSTAT-NL | grep "\.123" command to see if the UDP 123 port is already listening.

sudo ntpd

Manual Sync Time:

Ntpdate time.nist.gov

To turn off the NTP service:

MacOS x uses the LAUNCHCTL Management system service and LAUNCHCTL detects the service status and automatically restarts the service if the service is stopped;

The NTPD service will be stopped using the following command, but will automatically restart the service after about 5 seconds; sudo launchctl stop org.ntp.ntpd

However, the service can be removed from the launchctl;

Use the following command to remove the NTPD service sudo launchctl remove org.ntp.ntpd

Later we also want to let the system automatically run the service can use the following command;

Use Mdfind to view the NTPD location and load to Launchctl:sudo launchctl load/system/library/launchdaemons/with load Org.ntp.ntpd.plist then restart the service: sudo launchctl start org.ntp.ntpd

Reference: http://blog.csdn.net/mydo/article/details/18230571

Lunchctl Knowledge: http://blog.sina.com.cn/s/blog_4fcd1ea30100x5rf.html

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Mac OS X NTP service turned on and off