Source state '*' = current synced, '+' = combined, '-' = not combined, Source mode '^' = server, '=' = peer, '#' = local clock. An instance needs access to the internet for the externalįor Windows instances, see Set the time for a Windows instance. More information about NTP and public time sources, see. Alternatively, you can use external NTP sources.

Use the following procedures to configure the Amazon Time Sync Service on your instance The latest versions ofĪmazon Linux 2 and Amazon Linux AMIs synchronize with the Amazon Time Sync Service by default. Your security group rules or your network ACL rules to allow access. Your instance does not require access to the internet, and you do not have to configure The IPv6 address is only accessible on Instances built on the Nitro System. IPv4 address or the fd00:ec2::123 IPv6 address for any instance running in a The Amazon Time Sync Service is available through NTP at the 169.254.169.123 The Amazon Time Sync Service automatically smooths any leap seconds that are added to Of the Coordinated Universal Time (UTC) global standard through Network Time Protocol (NTP). This service uses a fleet of satellite-connectedĪnd atomic reference clocks in each AWS Region to deliver accurate current time readings If your instance'sĭate and time are not set correctly, the date in the signature may not match the date of theĪmazon provides the Amazon Time Sync Service, which is accessible from all EC2 instances,Īnd is also used by other AWS services.

Requests from your instance, these tools sign requests on your behalf. If you use the AWS CLI or an AWS SDK to make Most system logs include a time stamp that you can use to determine when problems occurredĪnd in what order the events took place. A consistent and accurate time reference is crucial for many server tasks and processes.

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