monitoring Weewx with Nagios

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sali...@gmail.com

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Jan 3, 2024, 2:38:54 PM1/3/24
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hello, first of all, happy new year everyone.
I would like to monitor my weather station "weewx" with my Nagios; what process should I monitor to verify that Weewx is active? I found a plugin "check_snmp_proc.sh", it works for "sshd" for example. do you have an idea ?
Good evening

Patrick

matthew wall

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Jan 3, 2024, 2:51:51 PM1/3/24
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On Wednesday, January 3, 2024 at 2:38:54 PM UTC-5 sali...@gmail.com wrote:
I would like to monitor my weather station "weewx" with my Nagios; what process should I monitor to verify that Weewx is active? 

first order would be to check whether weewxd is running.  but a better check would be to look at the age of the latest report.  if that report is older than the archive interval, then warn.  if it is older than 2 or 3 archive intervals, the fail.

another approach is to make weewx emit status information, then make your nagios plugin look at that.  a simple way to do this is make a single weewx template file that emits sensor timing/status information.  just do a bunch of name=value pairs so its trivial to parse.  then make your nagios plugin check the age of that file for the "is weewx emitting data every archive interval" test, then make each of the names in the pairs additional information for your nagios checks.

m

matthew wall

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Jan 3, 2024, 2:59:39 PM1/3/24
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here are some nagios plugins that i wrote a *very* long time ago.  you might be able to use the pattern in check_wview as the basis for a check_weewx.  you might even be able to use check_wview directly, depending on the schema you use in weewx.



sali...@gmail.com

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Jan 3, 2024, 3:01:20 PM1/3/24
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ok, I didn't understand everything, but I was able to put "python3 /usr/share/weewx/weewxd" in the nagios plugins, and it responds: OK: Process exists. Running instances: 1, when I stop weewx it responds: CRITICAL: Process python3 does not exist, it's a start. for the archives I don't know how to do it.
THANKS Matthew

vince

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Jan 3, 2024, 3:51:11 PM1/3/24
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Here's a quick script to print secs since a file was last modified and complain if it's more than 10 minutes, as an example.  You could alternately throw a snmp trap for nagios to listen for,  use 'logger' to log a syslog message, etc.  Many ways to cause something to alert in a way that nagios could monitor for.

FWIW - I'd check for the archive being modified 'and' the last skin in your typical order to complete successfully, but these days monitoring weewx really isn't usually needed once you have it set up and working.

This example just checks that the sdb file(s) are being updated.

#!/bin/bash
#
# ref: https://stackoverflow.com/questions/19463334/how-to-get-time-since-file-was-last-modified-in-seconds-with-bash
#
cd /home/pi/weewx-data/archive
echo ""
for FILE in *.sdb
do
  DIFF="$(($(date +%s) - $(date -r ${FILE} +%s)))"
  if [ ${DIFF} -gt 600 ]
  then
      echo -n "ERROR"
  else
      echo -n "OK   "
  fi
  echo "   ${FILE} was last modified ${DIFF} seconds ago"
done
echo ""

Sample output:

pi@pi4:~/weewx-data/archive$ bash /tmp/secs-since-modified.sh

OK      ecowitt.sdb was last modified 53 seconds ago
ERROR   forecast.sdb was last modified 8159 seconds ago
OK      mem.sdb was last modified 60 seconds ago
OK      purpleair.sdb was last modified 60 seconds ago
OK      vp2.sdb was last modified 60 seconds ago

salinois

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Jan 3, 2024, 5:02:15 PM1/3/24
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thanks all

I will test that tomorrow and I will come back to you.

Bye

Patrick

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salinois

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Jan 4, 2024, 4:54:05 AM1/4/24
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hello Matthew and Vince.

I just looked at your files, I think "tell me if it's true" that your Nagios is on the same machine as "Weewx"; my Nagios is on a server outside the RPi, so I think there must be something missing in the programs to run it remotely, like I have in the other Nagios plugins; for example: -H $HOSTADDRESS$ etc etc;

tell me, because I'm not good at programming.

THANKS

Patrick

Le 03/01/2024 à 21:51, vince a écrit :

matthew wall

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Jan 4, 2024, 7:37:45 AM1/4/24
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On Thursday, January 4, 2024 at 4:54:05 AM UTC-5 sali...@gmail.com wrote:

I just looked at your files, I think "tell me if it's true" that your Nagios is on the same machine as "Weewx"; my Nagios is on a server outside the RPi, so I think there must be something missing in the programs to run it remotely, like I have in the other Nagios plugins; for example: -H $HOSTADDRESS$ etc etc;

patrick,

if nagios is on the same machine, then you can run the plugin directly. but if nagios is on a different machine, then you must install the "nagios remote plugin executor" (NRPE) on the machine running weewx.  then NRPE will run the plugin.

if you do not want to install NRPE on the weewx machine, then you must talk to the weewx machine over standard network interfaces. in that case, your nagios plugin might do an http/https request to the weewx machine to see when the weewx report was last updated.  of course, this assumes that you are running a web server on the weewx machine to publish your weewx reports.  you could also run a nagios ssh plugin - in that case, the plugin should execute a command on the weewx machine that returns the information you want in nagios.  that would use the same approach that you see in the nagios_wview plugin (check for existance of weewxd process, check database timestamp, return data from database as performance data), but do it over an ssh connection with shell scripting.

another approach would be to write a weewx service, say weewx-nagios, that listens on a network port then provides the information about weewxd and report status when it is queried.  

or create a weewx-snmp extension that runs on the weewx machine, gathers the weewx and report status, but responds to standard snmp queries. that would be the most generic approach, and would let you monitor weewx using much any tool that can do snmp - nagios, icinga, prtg, zabbix, etc.

m

cric...@pobox.com

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Jan 4, 2024, 9:19:41 AM1/4/24
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Here's another idea.  I don't know anything about Nagios, but I'm running this screwy setup where I made up my own
thermostat(s), and in the living room, the one has a small OLED display for set point, current temp, and also outside
temp and wind chill that gets sent from my weather station's weewx via MQTT.  I'm sending a few observations along
with the current time from weewx.  The receivers track to make sure the values are changing, and I get a text message
when things are askew.  In any case, if Nagios can listen to MQTT messages, this is pretty easy to set up.
Chris

salinois

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Jan 4, 2024, 9:30:29 AM1/4/24
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thanks Matthew,

that is I think, as windows machine. I will try it.

bye

patrick

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salinois

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Jan 4, 2024, 4:18:51 PM1/4/24
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hello Vince,

I test first in local on my RPi.

I have an error with your scrip.

 bash secs-since-modified.sh
secs-since-modified.sh: ligne 5 : cd: $'/var/lib/weewx/weewx.sdb\r': Aucun fichier ou dossier de ce type

secs-since-modified.sh: ligne 8: erreur de syntaxe près du symbole inattendu « $'do\r' »
'ecs-since-modified.sh: ligne 8: `do


I modified your script only here

#
cd /var/lib/weewx/weewx.sdb  => here my archive sdb
echo ""

tell me if I have good for modification.


hello Matthew,

I modified your script and the result

perl check_wview.txt
CRITICAL - last update was 108324 minutes ago at 17:52:17 21 oct. 2023| lastupdate=108323.8;30;120

run in local on RPi for the moment.

patrick




Le 03/01/2024 à 21:51, vince a écrit :
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salinois

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Jan 4, 2024, 4:52:43 PM1/4/24
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hello again Matthew,

I am testing your script on a RPi of test " no sensors connect", as weewx is "Active: active (exited) since Tue 2023-11-28 21:37:14 CET; 1 months 6 days ago", the error done by your script is good.

[CRITICAL - last update was 108331 minutes ago at 17:52:17 21 oct. 2023| lastupdate=108331.1;30;120]

I modified your script as that;

my $htfile = '/var/www/html/weewx/index.html';
my $dbfile = '/var/lib/weewx/weewx.sdb';

tell if OK.

I installed on my nagios the plugins NRPE and also on my RPI of test.

which command to test in command line with your script.

Your script must be here only my RPi (ip=192.168.0.161) ?

I tried it : ./check_nrpe -H 192.168.0.161 -c check_wview.txt from my Nagios

result: NRPE: Command 'check_wview.txt' not defined

Excuse for my english and I am newbie in programmation.

files on nagios: /usr/local/nagios/libexec/   

 check_tcp
check_breeze     check_ifstatus      check_oracle        check_time
check_by_ssh     check_imap          check_overcr        check_udp
check_clamd      check_ircd          check_ping          check_ups
check_cluster    check_load          check_pop           check_uptime
check_dhcp       check_log           check_procs         check_users
check_disk       check_mailq         check_real          check_wave
check_disk_smb   check_mrtg          check_rpc           check_wview.txt

files on RPi: /usr/local/nagios/libexec
272710 drwxrwxr-x 2 nagios nagios   4096  4 janv. 22:41 .
272681 drwxr-xr-x 6 root   root     4096  4 janv. 20:44 ..
272711 -rwxrwxr-x 1 nagios nagios 106268  4 janv. 20:44 check_nrpe
272722 -rwxrwxr-x 1 nagios nagios   5783  4 janv. 22:16 check_wview.txt
272721 -rwxr-xr-x 1 nagios nagios    419  4 janv. 21:44 secs-since-modified.sh

                /usr/local/nagios/etc

 272714 drwxrwxr-x 2 nagios nagios  4096  4 janv. 22:04 .
272681 drwxr-xr-x 6 root   root    4096  4 janv. 20:44 ..
272716 -rw-r--r-- 1 nagios nagios 12477  4 janv. 22:04 nrpe.cfg

nrpe.cfg => allowed_hosts=127.0.0.1,::1,192.168.0.200



Patrick


Le 04/01/2024 à 13:37, matthew wall a écrit :
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salinois

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Jan 4, 2024, 5:34:30 PM1/4/24
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again me, sorry

I forgot to install the Nagios-plugins on my RPi, now is good with this command:

./check_nrpe -H 192.168.0.161 -c check_load
WARNING - load average per CPU: 0.17, 0.20, 0.13|load1=0.168;0.150;0.300;0; load5=0.200;0.100;0.250;0; load15=0.133;0.050;0.200;0;

but no good with your script:

./check_nrpe -H 192.168.0.161 -c check_wview.txt

NRPE: Command 'check_wview.txt' not defined

is it my syntax is correct ?!!!

bye I talk to you tommorow

Patrick

sorry again.

Le 04/01/2024 à 13:37, matthew wall a écrit :
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salinois

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Jan 5, 2024, 8:32:53 AM1/5/24
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hello Matthew et Vince,

A good news;

your script , Matthew run well, I searched where I had an error, I forgotted to add your script inside nrpe.cfg

but now I search why I can't install "E: Impossible de trouver le paquet libdb-sqlite3-perl".

result:  ./check_nrpe -H 192.168.0.161 -c check_wview.txt
WARN - last update was 53.00 seconds ago at 14:25:15 05 Jan 2024 - perfdata requested but DBI is not installed| lastupdate=0.883333333333333;30;120

to be continued

Patrick

Le 04/01/2024 à 13:37, matthew wall a écrit :
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salinois

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Jan 5, 2024, 11:39:13 AM1/5/24
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again me,

I can installed the paquet libdbd-sqlite3-perl, I made an error with my keyboard, an other one.....grrrrr

now the script is OK.

./check_wview.txt
OK - last update was 3.00 seconds ago at 17:35:16 05 janv. 2024| lastupdate=0.05;30;120 dewpoint=49.6823087947918 rainRate=0 appTemp=67.3970645525476 windchill=67.4003136423159 rain=0 heatindex=66.3327863853724 outHumidity=53.0306676345731 altimeter=29.6960696753803 soilTemp1=66.8762681818182 barometer=29.6316015533198 humidex=69.555285488496 outTemp=67.4003136423159 pressure=27.3071543536385 windGust=0 windrun=0 windSpeed=0 cloudbase=6323.41291818588

Now , I must test the script of Vince.

thank Matthew

Patrick


Le 04/01/2024 à 13:37, matthew wall a écrit :
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