Nagios Support Forum

pbroste wrote: Thanks for following up, want to verify the cron job is going off without issue. We see that every 5 minutes the following cron is run:

find /etc/cron* -type f -exec grep -Eri "mrtg" -A 2 -B 2 {} \;
*/5 * * * * root LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --user=nagios --group=nagios

[root@nagios ~]# find /etc/cron* -type f -exec grep -Eri "mrtg" -A 2 -B 2 {} \;
*/5 * * * * root LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --user=nagios --group=nagios

pbroste wrote: Want to verify the cron status:

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systemctl status crond

[root@nagios ~]# systemctl status crond
● crond.service - Command Scheduler
Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2022-01-29 13:20:33 CST; 1 weeks 3 days ago
Main PID: 671 (crond)
CGroup: /system.slice/crond.service
└─671 /usr/sbin/crond -n

Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

pbroste wrote: Manual run through to verify:

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LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --user=nagios --group=nagios --debug="cfg,snpo" --check

Quick look at the logs that pop-up for any interesting messages:

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LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --user=nagios --group=nagios --debug="cfg,snpo" --check

pbroste wrote: Send over the copy of your mrtg.cfg:

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/etc/mrtg/mrtg.cfg

[root@nagios ~]# cat /etc/mrtg/mrtg.cfg
######################################################################
# Multi Router Traffic Grapher -- Example Configuration File
######################################################################
# This file is for use with mrtg-2.0
#
# Note:
#
# * Keywords must start at the begin of a line.
#
# * Lines which follow a keyword line which do start
# with a blank are appended to the keyword line
#
# * Empty Lines are ignored
#
# * Lines starting with a # sign are comments.

# Where should the logfiles, and webpages be created?

# Minimal mrtg.cfg
#--------------------

HtmlDir: /var/www/mrtg
ImageDir: /var/www/mrtg
LogFormat: rrdtool
LogDir: /var/lib/mrtg
ThreshDir: /var/lib/mrtg
WorkDir: /var/lib/mrtg
Forks: 4
EnableSnmpV3: yes

Include: conf.d/*.cfg

EnableSNMPv3: yes
[root@nagios ~]#

pbroste wrote: Thanks for following up with the details, want to verify that you are receiving a list of devices that are no longer available by running with '--check'. Want to verify permission issue.

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LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --check

compare with this:

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LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --user=nagios --group=nagios --check

pbroste wrote: Let's get the version:

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LANG=C LC_ALL=C /usr/bin/mrtg

[root@nagios ~]# LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --check
[root@nagios ~]# LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lib/mrtg/mrtg.lock --confcache-file /var/lib/mrtg/mrtg.ok --user=nagios --group=nagios --check
[root@nagios ~]# LANG=C LC_ALL=C /usr/bin/mrtg
Usage: mrtg <config-file>

mrtg-2.17.4 - Multi Router Traffic Grapher

Copyright 1995-2006 by Tobias Oetiker
Licensed under the Gnu GPL.

If you want to know more about this tool, you might want
to read the docs. You can find everything on the
mrtg website:

http://oss.oetiker.ch/mrtg/

[root@nagios ~]#