Nagios Support Forum

Hi,

in my home, my WIFI signal drops from time to time.
It lasts only 20 seconds to 5 minutes and then it comes back.
I would like to monitor these drops.

I have a Raspbian Pi with NagiosPi that's connected trough WIFI.
I have configured one host in Nagios: my router which is monitored by Ping.

I was thinking of using the report "trends" to watch when it was offline, but this report shows it's always online altough the host goes down from time to time...

What am I doing wrong?

Is there a better way to do it?

I believe reducing the time on this check should provide you the accurate results you're looking for. Look for the host / service you're using to monitor that service, and add into it -

Another thought is to monitor your system log to see if there is text matching some sort of wifi drop or rediscover. That way, you're not relying on catching it in the act, but instead are relying on the system reporting it in the logs, and you seeing it there.

In addition to reducing your check_interval, you'll probably want a critical right away:
-or if you expect dropped packets once in awhile:

rkennedy wrote:I believe reducing the time on this check should provide you the accurate results you're looking for. Look for the host / service you're using to monitor that service, and add into it -

Code: Select all

check_interval 1

It was allready set to 1.

Does this mean 1 minute?

eloyd wrote:Another thought is to monitor your system log to see if there is text matching some sort of wifi drop or rediscover. That way, you're not relying on catching it in the act, but instead are relying on the system reporting it in the logs, and you seeing it there.

Good idea, thanks

HenkR wrote:

rkennedy wrote:I believe reducing the time on this check should provide you the accurate results you're looking for. Look for the host / service you're using to monitor that service, and add into it -

Code: Select all

check_interval 1

It was allready set to 1.

Does this mean 1 minute?

Yes. @eloyd made a good comment - if a one minute check_interval isn't good enough then checking the logs may be more viable. Does that solution work for you?

Yes, I'm using the logs.

But there's one thing I don't understand about Nagios:

Sometimes, when I click on hosts, I see that it detected the host went down by looking at the time in the duration column.
However when I look at the trends report it shows it hasn't been down.

I think the most likely explanation would be that it is coming back up before it reaches its max check attempts.

Object Definitions wrote: This directive is used to define the number of times that Nagios will retry the host check command if it returns any state other than an OK state. Setting this value to 1 will cause Nagios to generate an alert without retrying the host check. Note: If you do not want to check the status of the host, you must still set this to a minimum value of 1. To bypass the host check, just leave the check_command option blank.

https://assets.nagios.com/downloads/nag ... .html#host

With my host, I have configured a PING service and I also have the check command check-host-alive configured.

Does this mean I am actually doing 2 checks?