AWS Lambda: NTP Server

Question

I have a service on an AWS Lambda that consumes an API via REST API. This API service team asked us which NTP Server we are using and I found an information that this is not publicly available because it is an internal configuration of AWS infrastructure (since we did not do any manual configuration).

I would like more details about it and to know if this information is correct. If so, is it possible to know which NTP our AWS Lambda is using if we open a support ticket?

Riku_Kobayashi · Answer

Hello.

As you may be aware, this is an internal mechanism of AWS services, so there is no guarantee that you will receive a response even if you contact AWS Support.  
It depends on why you need NTP information for Lambda, but if you need the information to comply with customer compliance, you may be able to get some information by contacting the compliance report from the URL below.  
https://aws.amazon.com/contact-us/compliance-support/?nc1=h_ls

Didier Durand · Answer

Hi,

You may want to have a look at this announcement: https://aws.amazon.com/about-aws/whats-new/2022/11/amazon-time-sync-internet-public-ntp-service/

Corresponding doc is here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#configure-time-sync

Best,

Didier

Oleksii Bebych · Answer

NTP at the following IP address endpoints:
```
IPv4: 169.254.169.123
IPv6: fd00:ec2::123
```
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#configure-ec2-ntp

AWS Lambda: NTP Server

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