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macOS ntp not working
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macOS ntp not working
我的老macbook pro总是时不时跟ntp服务器对不上时间，少的时候差几秒，多的时候几分钟。之前root下 crontab 每小时跟aliyun ntp对时，结果这次怎么执行都会偏差两秒，连续sntp也还是两秒。
1 mac 同步时间使用 sntp，命令格式
sudo sntp -sS ntp.ntsc.ac.cn
2 sntp的输出可以使用 -d 来看到 debug log，基本格式是
+2.017470 +/- 0.000153 ntp.ntsc.ac.cn 114.118.7.161
上边是我的输出，我连续执行1 的命令，每次第一列都是2秒左右，开 -d 可以看到解释
ipaddr: 114.118.7.163
+2.020197 +/- 0.069878 ntp.ntsc.ac.cn 114.118.7.163
gtod: 1633021695.100748
adjust: 2.020196
set: 1633021697.120944快速解决方案，把timed kill掉，再sntp同步，就好了。
稳定解决方案，暂无。
长期不稳定但有效的解决方案，写脚本，连续 n 次采样偏差，自动杀 timed，反正系统自己会起。
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