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I am using my Raspberry Pi with OpenMediaVault, a variant of Debian/Raspian intended for running a NAS server. The web interface for the operating system features a user interface that allows for hardware usage to be tracked using graphs generated by RRDTool that look like this:

RRDTool Graphs in OpenMediaVault

Obviously, the graphs are based on system time. I've noticed that this causes some problems when the Pi is rebooted or booted from a powered off state. When I first check the graphs after a reboot or fresh start, the graphs list a "Last Updated" date of December 2015, and when I force a refresh of the data, the graphs all end up looking like this:

RRDTool Graph Gone Wrong

I understand that this is happening because of the lack of an RTC on the Raspberry Pi, and although one could be acquired, I would like to work around doing so.

To do this, I would like to configure my Pi to sync both its date and time to an NTP server before RRDTool services kick in. Is it possible to achieve something like this?

DaveTheMinion
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2 Answers2

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You could use the command ntpdate pool.ntp.org once the network is up (in a script in /etc/network/ip-up.d) and then once a day in root's crontab. If the time difference is too big after 24 hours, you can run it more frequently, like every 6 hours.

ott--
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There is only one way to reach the Stratum-1 servers, and that is to use time.nist.gov which is a pool address all by itself.

It will reach the quickest and most accurate time available on the web.

It will run automatically.

Here is a Q&A on this Stack Exchange that explains how to do it:

How do I set Raspbian to use the primary time server time.nist.gov?

SDsolar
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