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Munin-node Plugin Configurations

Submitted by sandip on Thu, 12/25/2008 - 00:50

HDD Temperature

You can usually identify which hard disks are on your system by looking in "/proc/ide" and in "/proc/scsi".

# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: WDC WD2500YS-01S Rev: 20.0
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: WDC WD2500YS-01S Rev: 20.0
  Type:   Direct-Access                    ANSI SCSI revision: 05

`fdisk -l` lists the two drives as "sda" and "sdb".

Here's the output of `smartctl -a -d ata /dev/sda`:

Device Model:     WDC WD2500YS-01SHB1
Serial Number:    WD-WCANY4128422
Firmware Version: 20.06C06
User Capacity:    251,000,193,024 bytes
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   7
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Wed Dec 24 23:52:19 2008 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

In order to monitor HDD temperature, edit "/etc/munin/plugin-conf.d/hddtemp_smartctl":

[hddtemp_smartctl]
user root
env.drives sda sdb
env.args_sda -d ata
env.args_sdb -d ata

Test output via:

# env drives="sda sdb" args_sda="-d ata" args_sdb="-d ata" /etc/munin/plugins/hddtemp_smartctl

Which should show the temperature in Celsius:

sda.value 28
sdb.value 28

Restart munin-node and wait a while for the munin graphs to show up.

Check the log, "/var/log/munin/munin-node.log" for troubleshooting.

hddtemp_smartctl plugin does not send out email notification by default and has to be specified on a per host basis in "munin.conf":

[foo.example.com]
    address 127.0.0.1
    use_node_name yes
    hddtemp_smartctl.sda.critical 55
    hddtemp_smartctl.sda.critical 55

Reference: munin alert email notification

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Test with munin-run

Submitted by sandip on Fri, 01/29/2010 - 00:48.

Below is the actual way to be testing plugins, as it automatically reads the conf file and runs as the correct user.

munin-run hddtemp_smartctl

Reference: Concise guide to plugin authoring

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Good idea, but only works with newer distros (or old drives)

Submitted by philiph on Tue, 01/20/2009 - 14:49.

The big problem with smart is that it was not compatible with SATA drives for a very long time (all through CentOS 4.x for example). I believe the latest CentOS 5 now supports smart on SATA so you can once again monitor hard drive temperatures.

So if you are running an older system with a PATA drive this works, or a newer system with SATA and a recent kernel 2.6 that works too. There's just a big gap of several years in the middle where smart was generally useless due to no SATA support.

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