Linux, Solaris and FreeBSD iostat monitoring with Cacti

参考：

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Below is the full text from the included README :
INSTALLATION
------------

1.) CRON JOB

On the server to be monitored, copy scripts/iostat.pl to /usr/local/bin.
Then, define a cron job that creates the iostat.cache file. For example, on
most Linux systems, you should be able to create a file called
/etc/cron.d/iostat with the following contents :

* * * * * root cd /tmp && iostat -xkd 30 2 | sed 's/,/\./g' > io.tmp && mv io.tmp iostat.cache

And on Solaris, you'll need to edit a suitable crontab (root or sys would be the
obvious choices) with the following :

* * * * * cd /tmp && iostat -dx 30 2 > io.tmp && mv io.tmp iostat.cache

This will create the cache file once every minute, and will sample for 30
seconds. You can adjust this figure as necessary, but avoid the trap of setting
it to sample for 60 seconds - as the command will take slightly longer than 1
minute to run, you'll end up with multiple processes running.

2.) SNMPD MODIFICATION

Edit your NET-SNMPD snmpd.conf file to include the following (adjusting the OID
if necessary, see above) :

pass .1.3.6.1.3.1 /usr/bin/perl /usr/local/bin/iostat.pl

There is also a much improved persistent script which involves a lot less forking,
and also a caching mechanism. If you would like to use this version (recommended),
add it to your snmpd.conf with the following instead :

pass_persist .1.3.6.1.3.1 /usr/bin/perl /usr/local/bin/iostat-persist.pl

Only use one of these - don't enable both!

Then restart your snmpd process. After the cron job has run (check for the
existence of the /tmp/iostat.cache file), you should be able to test the script
returns data, using a snmpwalk command similar to the following :

snmpwalk -v1 -c community_string your_host_ip .1.3.6.1.3.1.2

You should get a list of devices on the server returned, which will look similar
to the following on Linux :

SNMPv2-SMI::experimental.1.2.1 = STRING: "sda"
SNMPv2-SMI::experimental.1.2.2 = STRING: "dm-1"
SNMPv2-SMI::experimental.1.2.3 = STRING: "sdb"
SNMPv2-SMI::experimental.1.2.4 = STRING: "dm-2"

Or on Solaris :

SNMPv2-SMI::experimental.1.2.1 = STRING: "cmdk0"
SNMPv2-SMI::experimental.1.2.2 = STRING: "cmdk1"
SNMPv2-SMI::experimental.1.2.3 = STRING: "md0"
SNMPv2-SMI::experimental.1.2.4 = STRING: "md1"

If you get no output, go back and double check the previous two steps.

3.) CACTI INSTALLATION

For Linux, copy snmp_queries/linux/iostat.xml to your Cacti server, and place it
under /resource/snmp_queries. Under Debian, this is
/usr/share/cacti/resource/snmp_queries , but may be different for other systems.

For Solaris, the process is the same, but the file in this archive is
snmp_queries/solaris/solaris-iostat.xml

If you've decided to change the OID, you'll also need to modify these files.

Next, log into your Cacti web interface, and click on "Import Templates". Import
all of the templates under the templates directory for your OS.

You should then be able to go to the host device you want to monitor, and add
the new data queries. Then, click on "Create Graphs for this Host", and
select the devices you want to graph.