![]() ![]() Verify the time synchronization metrics that are reported by In the output that's returned, ^* indicates the preferred time MS Name/IP address Stratum Poll Reach LastRx Last sample | / '?' = unreachable, 'x' = time may be in error, '~' = time too variable. Source state '*' = current synced, '+' = combined, '-' = not combined, Source mode '^' = server, '=' = peer, '#' = local clock. This section describes how to set the time for EC2 instances with IPv4 addresses depending on the type of Linux distribution. Verify that your system is using the Amazon Time Sync Public NTP pool with Restart systemd-timesyncd using the systemctl Server will cause it to be selected as the only NTP server. Configuring the Amazon Time Sync Service Public NTP as the fallback This prevents inadvertently moving between smeared and un-smeared time Within the same configuration file, set the content of the īlock to NTP=FallbackNTP=. Restart the daemon using sudo service chrony force-reload (forĬhrony) or sudo service ntp reload (for ntpd) Your machine from trying to mix smeared and non-smeared servers. Remove or comment out other lines starting with server to prevent (if you are using ntpd) using your favorite text editor.ĭo not edit the line server 169.254.169.123 prefer iburst minpoll 4 maxpoll 4 to ensure your EC2 instance stays connected to the local Amazon Time Sync service. ![]() ![]() To configure Amazon Time Sync Public NTP for Linux:chrony or ntpd For the configuration instructions, seeĬonfigure the time for clients with Amazon Time Sync Public NTP. Satellite-connected and atomic reference clocks in each AWS Region. The Amazon Time Sync Service Public NTP is supported globally by our fleet of The Amazon Time Sync service, automatically smooths any leap seconds that are added to UTC. Of Amazon EC2 to the Amazon Time Sync Service, you can use the Amazon Time Sync Public NTP pool An instance needs access to the internet for the externalįor a backup to the Amazon Time Sync link-local service, and to connect resources outside 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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