Hello all,
I can see in my observium installation that many devices changed their status to down(dns). This is a new installation and we migrated the configuration yesterday on a new server and devices were working properly. At around the same time (14:20:00) a lot of our machines changed their status to down. The message in the Event log is "Device status changed to Down (dns)". I tried to find what the problem may be but I can see SNMP are correct and dns records exist for the systems. Any ideas?
Thank you, Marios
Are you able to reach your devices with their DNS from the server were Observium is running on?
Mit freundlichem Gruß wilhelm.tel GmbH
Denis Klimek Carrier Manager & Professional Network Engineer IP-Systemtechnik Tel: +49 (0) 40 / 521 04 - 1049 -> Work From Home Mobil: +49 (0) 151 / 652 219 06
dklimek@stadtwerke-norderstedt.de www.wilhelm-tel.de
______________________________________________
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Postanschrift: wilhelm.tel GmbH Heidbergstraße 101-111 22846 Norderstedt
Geschäftsführer: Jens Seedorff, Theo Weirich Vorsitzender des Aufsichtsrats: Christoph Mendel Handelsregister: HRB 4216 NO, Amtsgericht Kiel Umsatzsteuer ID: DE 81 299 7663
[ig]https://www.instagram.com/azubiteam/[fb]https://www.facebook.com/wilhelmtel.norderstedt/
Von: observium observium-bounces@observium.org Im Auftrag von Marios Palechoros via observium Gesendet: Dienstag, 27. Oktober 2020 10:35 An: observium@observium.org Cc: Marios.P@crowe.com.cy Betreff: [Observium] Many devices shown as down(dns)
Hello all,
I can see in my observium installation that many devices changed their status to down(dns). This is a new installation and we migrated the configuration yesterday on a new server and devices were working properly. At around the same time (14:20:00) a lot of our machines changed their status to down. The message in the Event log is "Device status changed to Down (dns)". I tried to find what the problem may be but I can see SNMP are correct and dns records exist for the systems. Any ideas?
Thank you, Marios
/agree
Only time I've seen this is when I have local DNS client issues on the polling server. Like the unbound process stopped, or resolv.conf got borked.
...Ron
On 2020-10-27 05:01, Klimek, Denis via observium wrote:
Are you able to reach your devices with their DNS from the server were Observium is running on?
Mit freundlichem Gruß
wilhelm.tel GmbH
DENIS KLIMEK
Carrier Manager & Professional Network Engineer
IP-Systemtechnik
Tel: +49 (0) 40 / 521 04 - 1049 -> WORK FROM HOME
Mobil: +49 (0) 151 / 652 219 06
dklimek@stadtwerke-norderstedt.de [1]
www.wilhelm-tel.de [2]
Postanschrift:
wilhelm.tel GmbH
Heidbergstraße 101-111
22846 Norderstedt
Geschäftsführer: Jens Seedorff, Theo Weirich
Vorsitzender des Aufsichtsrats: Christoph Mendel
Handelsregister: HRB 4216 NO, Amtsgericht Kiel
Umsatzsteuer ID: DE 81 299 7663
[3] [4]
VON: observium observium-bounces@observium.org IM AUFTRAG VON Marios Palechoros via observium GESENDET: Dienstag, 27. Oktober 2020 10:35 AN: observium@observium.org CC: Marios.P@crowe.com.cy BETREFF: [Observium] Many devices shown as down(dns)
Hello all,
I can see in my observium installation that many devices changed their status to down(dns). This is a new installation and we migrated the configuration yesterday on a new server and devices were working properly. At around the same time (14:20:00) a lot of our machines changed their status to down. The message in the Event log is "Device status changed to Down (dns)". I tried to find what the problem may be but I can see SNMP are correct and dns records exist for the systems. Any ideas?
Thank you, Marios
Links:
[1] http://mail.rjr-services.com/dklimek@stadtwerke-norderstedt.de [2] http://mail.rjr-services.com/www.wilhelm-tel.de [3] https://www.instagram.com/azubiteam/ [4] https://www.facebook.com/wilhelmtel.norderstedt/
observium mailing list observium@observium.org http://postman.memetic.org/cgi-bin/mailman/listinfo/observium
Hi,
this status mean - hostname(s) not resolved during polling process.
As example, when your DNS server not respond, stopped working as an user written here.
Marios Palechoros via observium wrote on 27.10.2020 12:35:
Hello all,
I can see in my observium installation that many devices changed their status to down(dns). This is a new installation and we migrated the configuration yesterday on a new server and devices were working properly. At around the same time (14:20:00) a lot of our machines changed their status to down. The message in the Event log is "Device status changed to Down (dns)". I tried to find what the problem may be but I can see SNMP are correct and dns records exist for the systems. Any ideas?
Thank you, Marios
observium mailing list observium@observium.org http://postman.memetic.org/cgi-bin/mailman/listinfo/observium
What is the reason for them being marked down in the eventlog?
dns/snmp/ping?
Usually if a device is marked down it's either that the hostname can't be resolved, or the device isn't responding to ping or snmp, which is often caused by firewalling.
adam.
jan.croene--- via observium wrote on 2024-07-16 09:18:
Hi,
Were you able to solve the problem? I have the same problem _______________________________________________ observium mailing list -- observium@lists.observium.org To unsubscribe send an email to observium-leave@lists.observium.org
Hi,
down by dns mean your resolver do not answer or down.
Make (and show) poller debug for an device: ./poller.php -d -h <device>
jan.croene--- via observium wrote on 16.07.2024 12:18:
Hi,
Were you able to solve the problem? I have the same problem _______________________________________________ observium mailing list -- observium@lists.observium.org To unsubscribe send an email to observium-leave@lists.observium.org
Thanks, the problem is solved. It seems there was an issue with hostnames containing a '+' in the /etc/hosts file. In Ubuntu22 this was not an issue, but in Ubuntu24 it causes some DNS polling problems.
participants (6)
-
Adam Armstrong -
jan.croene＠police.belgium.eu -
Klimek, Denis -
Marios.P＠crowe.com.cy -
Mike Stupalov -
ron＠rjr-services.com