ntpd local clock not immediately usable at boot

 When you encounter the message "ntpd local clock not immediately usable at boot" while using the Network Time Protocol daemon (`ntpd`), it typically means that `ntpd` is starting up but hasn't yet synchronized with a time source. This is a common message during the initial startup of the NTP service. Here's what you can do:


1. **Wait for Synchronization**: In most cases, `ntpd` will eventually synchronize with a time source. It may take a few moments or even minutes, depending on your system and network conditions. After synchronization, the local clock becomes usable.


2. **Check NTP Configuration**: Ensure that your NTP configuration is correctly set up to access NTP servers or a time source. Review your NTP configuration file, typically located at `/etc/ntp.conf`, and verify the server settings. You should have a list of NTP servers or sources that `ntpd` can use for time synchronization.


3. **Network Connectivity**: Ensure that your server has network connectivity to reach the configured NTP servers. If there are network issues, `ntpd` may have trouble syncing with time sources.


4. **NTP Service Status**: You can check the status of the NTP service to see if it's synchronized. Use the following command:


   ```bash

   ntpq -p

   ```


   This command will display a list of NTP servers and their synchronization status. When the `reach` column shows values other than 0, it means the server has been reached.


5. **Consider Using a Different Time Source**: If your system's local clock isn't suitable for your requirements, you might consider using a different time source or a GPS-based NTP server for more accurate time synchronization.


6. **Monitoring**: Implement monitoring and alerting for your NTP service. Tools like NTPMon can help you keep track of NTP synchronization status and alert you if there are issues.


Remember that `ntpd` may take a little time to synchronize with time sources, and this initial message is typically not a cause for concern unless it persists for an extended period or there are issues with synchronization.

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