Ntpdate
Troubleshooting Linux Time Synchronization with NTP
Time synchronization is an important system administration task for Linux systems. This guide explains how to configure, and also troubleshoot time issues.
Summary
Time Synchronization The network time protocol helps computer systems to synchronize their time. We know this protocol by its shorter name NTP. In the past, it was not really a big issue if your system was a few minutes off. This changed with the interconnected world we are now living in. One of the better examples is networks relying on the authentication protocol Kerberos. If your system time is not correct, you may not be able to authenticate.
Tlsdate: The Secure Alternative for ntpd, ntpdate and rdate
Normal NTP can be difficult to set-up, especially for desktop systems which don't need a very accurate time. The tool tlsdate might be a great alternative.
Summary
The Secure Alternative for ntpd, ntpdate and rdate The common protocol to synchronize the time, is named Network Time Protocol, or NTP. While this protocol works great for synchronizing systems to one or more multiple time sources, it is not always easy to set-up. One alternative is using tlsdate, a secure replacement to keep your systems in sync. About the Project The software is written in 2012 by Jacob Appelbaum and can be found at GitHub: tlsdate.