阿里巴巴的NTP架构及闰秒过度

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1. 阿里巴巴的NTP架构及闰 秒的保障 阿里巴巴 技术保障部 高级系统工程师 曹世军
2. • NTP •  NTP • 
3. NTP Network Time Protocol • Broadcast/Multicast • Symmetric • Client/Server
4. NTP C/S • Device A Client • Device B Server • Client • Server • Server • Client T1 T2 T3 T4 = (T4-T1)-(T3-T2) = 2s = ((T2-T1)+(T3-T4))/2 = 1h
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6. NTP
7. ntpdate vs ntpd • ntpdate , • ntpd
8. NTP three group of three • ntp two-server problem •  3 •  4 • local clock • prefer,maxpoll,minipoll • 
9. NTP • GPS + •  • 
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11. •  •  • 
12. • “ ” • UT TAI • UTC •  •  -> UT TAI 61 59
13. •  60 •  • Linux BUG •  JAVA MYSQL CPU 100%
14. IT ECS-VM NTP 2015
15. •  •  •  GPS
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18. 5000
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21. DNS •  http://www.alidns.com/ •  IP 223.5.5.5 223.6.6.6 •  Stable,Speedy,Smart NTP •  GPS •  •  : time1-7.aliyun.com (Unix-like) : time.pool.aliyun.com (Windows •  http://mirrors.aliyun.com/ •  :Daily,AM2:00-4:00 •  Linux
22. Q&A Thank you @ @

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