[Check_mk (english)] Dns cache not updating with system's one?

[David Schmidt]

Hi there,

I am running an Ubuntu 18.04.1 VM with Raw 1.4.0p33.

A host moved to another subnet and it's DNS was updated on the DNS
server on the domain.

After short time, as expected, from the VM's console I could resolve the
host correctly.


Check MK wouldn't update the host though. I managed to "force" it by
renaming the host in WATO and naming it back to the correct name.


Any idea why and how to fix it for the future?


Best

David

[Robert Sander]

Check MK wouldn't update the host though. I managed to "force" it by 
renaming the host in WATO and naming it back to the correct name.

Check_MK uses its own DNS cache to not have to resolve a name every time a check runs.

This cache gets updated every 24 hours.

You can manually update the cache with the "Update DNS Cache" button in the host properties in WATO.

Regards
--
Robert Sander
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin

https://www.heinlein-support.de

Tel: 030 / 405051-43
Fax: 030 / 405051-19

Amtsgericht Berlin-Charlottenburg - HRB 93818 B
GeschÀftsfÌhrer: Peer Heinlein - Sitz: Berlin

[David Schmidt]

Wow, that is a quick reply, thanks a lot!

Post by Robert Sander

Post by David Schmidt
Check MK wouldn't update the host though. I managed to "force" it by
renaming the host in WATO and naming it back to the correct name.

Check_MK uses its own DNS cache to not have to resolve a name every time a check runs.
This cache gets updated every 24 hours.
You can manually update the cache with the "Update DNS Cache" button in
the host properties in WATO.
Regards
--
Robert Sander
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin
https://www.heinlein-support.de
Tel: 030 / 405051-43
Fax: 030 / 405051-19
Amtsgericht Berlin-Charlottenburg - HRB 93818 B
GeschÀftsfÌhrer: Peer Heinlein - Sitz: Berlin
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[Andreas Döhler]

Second Option is that you use the DNS name inside the "IP" field inside
your host definition.
Then Check_MK resolves the name every time it makes contact to this host.
Good for devices with DHCP addresses.

Best regards
Andreas

Am Di., 13. Nov. 2018 um 17:50 Uhr schrieb David Schmidt <

Post by David Schmidt
Wow, that is a quick reply, thanks a lot!

Post by Robert Sander

Post by David Schmidt
Check MK wouldn't update the host though. I managed to "force" it by
renaming the host in WATO and naming it back to the correct name.

Check_MK uses its own DNS cache to not have to resolve a name every time a check runs.
This cache gets updated every 24 hours.
You can manually update the cache with the "Update DNS Cache" button in
the host properties in WATO.
Regards
--
Robert Sander
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin
https://www.heinlein-support.de
Tel: 030 / 405051-43
Fax: 030 / 405051-19
Amtsgericht Berlin-Charlottenburg - HRB 93818 B
GeschÀftsfÌhrer: Peer Heinlein - Sitz: Berlin
_______________________________________________
checkmk-en mailing list
Manage your subscription or unsubscribe
http://lists.mathias-kettner.de/mailman/listinfo/checkmk-en

_______________________________________________
checkmk-en mailing list
Manage your subscription or unsubscribe
http://lists.mathias-kettner.de/mailman/listinfo/checkmk-en

[David Schmidt]

Thanks for the tip!

Post by Andreas Döhler
Second Option is that you use the DNS name inside the "IP" field inside
your host definition.
Then Check_MK resolves the name every time it makes contact to this host.
Good for devices with DHCP addresses.
Best regards
Andreas
Am Di., 13. Nov. 2018 um 17:50 Uhr schrieb David Schmidt <

Post by David Schmidt
Wow, that is a quick reply, thanks a lot!

Post by Robert Sander

Post by David Schmidt
Check MK wouldn't update the host though. I managed to "force" it by
renaming the host in WATO and naming it back to the correct name.

Check_MK uses its own DNS cache to not have to resolve a name every time a check runs.
This cache gets updated every 24 hours.
You can manually update the cache with the "Update DNS Cache" button in
the host properties in WATO.
Regards
--
Robert Sander
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin
https://www.heinlein-support.de
Tel: 030 / 405051-43
Fax: 030 / 405051-19
Amtsgericht Berlin-Charlottenburg - HRB 93818 B
GeschÀftsfÌhrer: Peer Heinlein - Sitz: Berlin
_______________________________________________
checkmk-en mailing list
Manage your subscription or unsubscribe
http://lists.mathias-kettner.de/mailman/listinfo/checkmk-en

_______________________________________________
checkmk-en mailing list
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http://lists.mathias-kettner.de/mailman/listinfo/checkmk-en