Nagios Support Forum

Hi jolson.

Hmmm, still not working as it should.
I can see in the log that a hosts is down "HOST ALERT: sydkysten;DOWN;HARD;1;CRITICAL: CRITICAL: Host down" and a secund after i see that the host is up again "HOST ALERT: sydkysten;UP;HARD;1;OK"
and it's not the same host.

In my head is should be like this.
Host down.
check again after 5min
if host not up, alert.

i really can't see what im doing wrong.
we have about 105 clients that sends passive host check every 5min to our server.

I'm having a hard time making sense of your configs. In your first post you had the following:
and
The first one should be using a template named linux-server but you provided what looks like a different host named linux-host which won't play into the first one at all. You also specify a command named check_dummy but then you provide a definition for host-report-down:
I am also unsure of what you mean by "client" and "server" when specifying the host configs - can you please clarify which is which?

tmcdonald:

I'm sorry for the confusion, this is how it looks like.
Client meaning servers placed at costumers, so we clients sending a passive host-check answer to our nagios server every 5min, and that part is working fine, that i can see in the logfile af the nagios server "PASSIVE HOST CHECK: bmhtest;0;OK".

On the client "costumer server"
define host {
use linux-server
host_name bmhtest
address localhost
check_command check_dummy
check_interval 5
max_check_attempts 2
}


The thing that's not working is on the nagios server.
host_freshness_check_interval=60 so it should check every 1min, that a little so much, once every 5min would be fine, freshness_threshold is 10min.
but i see a lot of false/positive errors in the log, and it's bouncing up and down.
seems like something is conflicting, freshness_threshold is 10min, but it is tickert at the first check.

within same secund.
HOST ALERT: rodbyhavn;DOWN;HARD;1;CRITICAL: CRITICAL: Host down
HOST ALERT: rodbyhavn;UP;HARD;1;OK

On nagios server.
define host {
name linux-host
event_handler_enabled 1
flap_detection_enabled 1
failure_prediction_enabled 1
process_perf_data 1
retain_status_information 1
retain_nonstatus_information 1

check_period 24x7
check_interval 10
check_command host-report-down
retry_interval 0
max_check_attempts 1
active_checks_enabled 0
passive_checks_enabled 1
check_freshness 1
freshness_threshold 600
notifications_enabled 1
notification_period 24x7
notification_interval 120
notification_options d,u,s

define command{
command_name host-report-down
command_line /usr/lib/nagios/plugins/check_dummy 2 "CRITICAL: Host down"
}


I hope that it makes some sence.

I'm even more confused now - you say that you have the following config 'On the client "costumer server"':
but these config files should all be on the Nagios server. I also don't see any definition for the rodbyhavn host anywhere, just linux-host.

Hi tmcdonald.

Sorry for the late response, i have been busy with other work.
i'll try to explain it better.

Every client server, we have a passive nagios host check that runs every 5min, sending a passive "ok" to our nagios server. And that part works just fine, i can see that in the log on our nagios server.

On our nagios server, i have this in hosts.cfg
And it works.......almost
For some reason i get host down on some clients, but the client is up and running, and i can see that i get the passive "ok" from the clients in time.
And i can't figure out, why it only happens for some clients, and they all have the same configuration.
Hope it makes more sense now, the setup i mean

You should disable Active Checks for that host as that could be causing the check to run and send you the false notifications.
Change the following from to Save it and see if that fixes it for you.
Also, what version of Nagios are you running?

Hi tgriep.

I'm running 3.4.1, and i changed active_checks_enabled to 0, and im gonna wait and see if that would do the trick.
Now that i have changed active_checks_enabled to 0, there is a red cross on every host, saying "Check of this host have been disabled" and it's true, but
it there somehow i can get rid the red cross ?

Is it showing up on EVERY host, or just the ones you set the active to disabled on?

Hsmith:
It's on those hosts where active check is disabled, and that's all, i'm only using passive host check.

tgriep:
Looks like that the "active_checks_enabled = 0" did the trick , gonna do some test's today by shutting some of the hosts down.

Hey bmh,

Has your testing showed the issue resolved? Let us know if you need more assistance or if we can lock this post, thanks!