阿里巴巴的NTP架构及闰秒过度
2020-02-23 198浏览
- 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
- 5.
- 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 + • •
- 10.
- 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
- 16.
- 17.
- 18. 5000
- 19.
- 20.
- 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 @ @
