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Also, I believe all the major cloud providers provide a "TrueTime" API service. I forgot the name that AWS uses, but you can call it on your EC2 instances and m
by Cshelton 8y ago
Also, I believe all the major cloud providers provide a "TrueTime" API service. I forgot the name that AWS uses, but you can call it on your EC2 instances and make sure your hosts are all in sync. It's pretty cool.
- otterley 8y agoAFAIK AWS is only offering NTP service with a GPS source (i.e. stratum 1). TrueTime appears to be a service offering that is a step above that in terms of the guarantees it provides.
- Cshelton 8y agoAh, I've never had a use case for anything more accurate than NTP
- deleted 8y ago[deleted]
- jandrese 8y agoYou may never have built a system that needed it, but LTE cell handoffs require higher precision than NTP can supply. Almost every cell phone in use today benefits from highly precise timing. This is why PTP and high precision GPS devices are built to integrate with cell provider gear.
- fintler 8y agoTrueTime is more of a client side library that utilizes a service like NTPd. You can implement a toy version of TrueTime with about 60 lines of C which uses a single ntp_gettime call for each of the TrueTime api functions (now, before, after). If AWS's NTPd service offers drift <= 200 us/s, you could use it for TrueTime.