Re: [chrony-users] How to detect internet becoming available

[Uwe Fechner <uwe.fechner@xxxxxxxxxx>]

Dear Andrei,

You wrote:

"Why? chrony should recover when time sources become reachable."

Indeed, it seams to work ...

I used ntp before, and with ntp it did not work without restarting ntp ...

But what is the command
chronyc online

needed for if chronyd discovers the online status automatically?

I currently have it in the scripts /etc/network/if-up.d/01_start_chrony and

/etc/NetworkManager/dispatcher.d/wwan0 .

My chrony.conf file:

pool pool.ntp.org iburst auto_offline

driftfile /var/lib/chrony/drift

makestep 1.0 3

rtcfile /var/lib/chrony/rtc

rtconutc

rtcautotrim 30

You also asked:
"Is your board shut down when it gets power failure indication or it is simply switched off?"

It is just switched off, no shut down in case of power failure.

Uwe

---

From: Andrei Borzenkov <arvidjaar@xxxxxxxxx>
Sent: Saturday, September 11, 2021 12:10 PM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx <chrony-users@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [chrony-users] How to detect internet becoming available

 

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On 11.09.2021 13:02, Uwe Fechner wrote:
> Hello,
>
> we have an Linux ARM board that can be connected to the internet
> using a wired connection.
>
> Chrony is started at boot time.
>
> After a power failure it can happen that our board starts up BEFORE
> internet becomes available, for example because the router it is
> connected to has a higher startup-and-sync time than our board.
>
> How can I inform chrony that internet is available?
>

Why? chrony should recover when time sources become reachable.

> I know I can use the command "chronyc online", but how can I trigger
> that without using network manager?
>

Do you mean your sources are offline after boot? Is your board shut down
when it gets power failure indication or it is simply switched off?

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