Ubuntu ntp not updating time
If you just want to synchronise your computers clock to the network, the configuration file (for the ntpd program from the distribution, on any supported operating system - Linux, *BSD, Windows and even some more exotic systems) is really simple: The 0, 1, 2 and 3names point to a random set of servers that will change every hour.
You can use the exit status (return values) to verify its operations from a shell script or command line itself: The ntpq utility program is used to monitor NTP daemon ntpd operations and determine performance.
The program can be run either in interactive mode or controlled using command line arguments.
The procedures in this section show how to verify that the default NTP configuration is working correctly.
If your instance's date and time are not set correctly, the date in the signature may not match the date of the request, and AWS rejects the request.
Network Time Protocol (NTP) is configured by default on Amazon Linux instances, and the system time is synchronized with a load-balanced pool of public servers on the Internet and set to the UTC time zone. Amazon Linux instances are set to the UTC (Coordinated Universal Time) time zone by default, but you may wish to change the time on an instance to the local time or to another time zone in your network.
Most system logs include a time stamp that you can use to determine when problems occur and in what order the events take place.
If you use the AWS CLI or an AWS SDK to make requests from your instance, these tools sign requests on your behalf.
Network Time Protocol (NTP) is configured by default on Amazon Linux instances; however, an instance needs access to the Internet for the standard NTP configuration to work.
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In addition, your instance's security group rules must allow outbound UDP traffic on port 123 (NTP), and your network ACL rules must allow both inbound and outbound UDP traffic on port 123.