Background
My old NAS built on top of CentOS has some performence issues and the disks are quit old now. The hardware is leftovers that is approx 8 years old and not highend at that time either. The disks age has worried my for a time and I would like to have higher redunduncy with raid1/mirrored disks.
After some research I decided to run my new NAS on FreeNAS, which has all the features I use, like: CIFS, NFS, FTP, SSH, Rsync, Unison, iSCSI and also easy administration and disk management.
This article will describe how I did setup Nagios or op5 Monitoring on my FreeNAS system. I assume basic knowledge of Nagios or op5 Monitor.
Installing nrpe
Nrpe is the agent that nagios and op5 Monitor uses to monitor a system from the inside.
From the webgui add group nagios and user nagios. User nagios should be a meber of group nagios.
freenas:~# pkg_add -r nrpe2
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/i386/packages-7.3-release/Latest/nrpe2.tbz... Done.
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/i386/packages-7.3-release/All/perl-5.10.1.tbz... Done.
Removing stale symlinks from /usr/bin...
Skipping /usr/bin/perl
Skipping /usr/bin/perl5
Done.
Creating various symlinks in /usr/bin...
Symlinking /usr/local/bin/perl5.10.1 to /usr/bin/perl
Symlinking /usr/local/bin/perl5.10.1 to /usr/bin/perl5
Done.
cd: can't cd to /usr/include
Cleaning up /etc/make.conf... Done.
Spamming /etc/make.conf... Done.
Cleaning up /etc/manpath.config... Done.
Spamming /etc/manpath.config... Done.
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/i386/packages-7.3-release/All/libiconv-1.13.1_1.tbz... Done.
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/i386/packages-7.3-release/All/gettext-0.17_1.tbz... Done.
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/i386/packages-7.3-release/All/nagios-plugins-1.4.14,1.tbz... Done.
You already have a "nagios" group, so I will use it.
You already have a "nagios" user, so I will use it.
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Enable NRPE in /etc/rc.conf with the following line:
nrpe2_enable="YES"
A sample configuration is available in /usr/local/etc/nrpe.cfg-sample.
Copy to nrpe.cfg where required and edit to suit your needs.
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freenas:~# cp /usr/local/etc/nrpe.cfg-sample /etc/nrpe.cfg
I changed the allowed_hosts line and added my op5 Monitor host.
#Added by peter@it-slav.net 20101114echo 'nrpe'/usr/local/sbin/nrpe2 -c /etc/nrpe.cfg -d#End peter@it-slav.net # Let the PHP functions know we've finished bootingBOOTING=0# ./check_nrpe -H fnas -c check_load
OK - load average: 0.72, 0.85, 0.81|load1=0.721;15.000;30.000;0; load5=0.847;10.000;25.000;0; load15=0.808;5.000;20.000;0; So the nagios agent works.
Links
- op5, an Enterprise Monitor product company
- op5 Monitor, Enterprise Monitoring based on opensource
- Nagios, an excellent opensource monitor tool
- FreeNAS, very capable NAS based on FreeBSD
March 14th, 2012 at 4:57 pm
You need to put the cfg file in /conf/base/etc/nrpe.cfg and make rc.conf changes in the same directory for them to survive reboot.
March 14th, 2012 at 5:27 pm
Furthermore –
cp /usr/local/etc/rc.d/nrpe2 /conf/base/etc/rc.d/nrpe2
chmod +x /conf/base/etc/rc.d/nrpe2
Add to /conf/base/etc/rc.conf:
nrpe2_enable="YES"
nrpe2_configfile="/etc/nrpe.cfg"
March 14th, 2012 at 5:38 pm
………….
Fix pid dir for /etc/rc.d/nrpe2 status showing as not running even if it is:
mkdir /conf/base/var/spool/nagios
chown nagios:nagios /conf/base/var/spool/nagios
March 14th, 2012 at 6:18 pm
Ok, thanks
/Peter