[Xymon] Xymon disruption every night!

[L-M-J]

Problems appears on VMs and physical servers and Lan and DMZ equipments. I don't see a link between those devices :-( 


Le 29 janvier 2016 09:23:14 GMT+01:00, Becker Christian <christian.becker at rhein-zeitung.net> a écrit :
>Hi L-M-J,
>
>can you exclude that this behavior is coming from any network device
>like a switch or default gateway?
>
>Regards
>Christian
>
>Christian Becker
>IT-Services
>
>Christian.Becker at rhein-zeitung.net<mailto:Christian.Becker at rhein-zeitung.net>
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>Von: Xymon [mailto:xymon-bounces at xymon.com] Im Auftrag von L-M-J
>Gesendet: Freitag, 29. Januar 2016 08:57
>An: Xymon at xymon.com
>Betreff: [Xymon] Xymon disruption every night!
>
>Hi,
>
>I'm running Xymon since 6 years (4.3.17 atm) on Debian 7.8
>3.2.0-4-amd64
>Since 1 month now, every night, between 0h30 or 2h am at +/- 30 min,
>around 30 hosts become unreachable :
>
>Fri Jan 29 01:16:38 2016 conn NOT ok : DNS lookup failed
>Unable to resolve hostname foo.bar.local
>System unreachable for 3 poll periods (170 seconds)
>green 0.0.0.0 is alive (0.02 ms) [<- 127.0.0.1<http://127.0.0.1>]
>
>
>- Got around 500 monitored hosts and looks like the same hosts are
>lost every single night.
>- Those monitored hosts are not necessary on the same network, not
>the same OS.
>- We cross monitored the same hosts and the other monitoring tool
>doesn't have report the DNS outage.
>- I ran a DNS lookup every seconds on the Hobbit server several days
>and it never reported a DNS outage.
>- I don't have any crontab installed on the server who could disturb
>Xymon.
>- Nothing strange in the Xymon logs nor the server logs, no memory
>leaks or CPU overloaded.
>- The rest of the day, Xymon server behavior is normal.
>- What I've done on the server 1 month ago ? I don't know, no system
>upgrade or so.
>- I had DNSMASQ acting like a cache, I disabled it : same issue
>- /etc/resolv.conf is quite light : search bar.local, next line :
>nameserver IP.OF.OUR.DNS.SERVER1, just like other servers
>
>The issue could be anywhere : inside or outside the server, Xymon or
>not... I have to confess, I'm running out of ideas to find the issue,
>is
>anyone here may have some leads, I will be thankful !
>
>Have a nice day!

-- 
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