Monitor a Synology NAS with Munin
424 words, 2 minutes
My Synology DiskStation DS409slim is, via the DSM software, SNMP aware. This means I can poll it to get some information using a SNMP capable monitoring system. This is how I configured Munin to grab some metrics from the NAS.
Enabling SNMP on the NAS
By default, the SNMP service is not enabled. So, first of all, you’ll need to enable it:
- log on to the NAS Web interface ;
- browse to the configuration panel and, from the “Network Services” section, click the “SNMP” icon ;
- activate the service and fill-in the fields ;
- apply the changes using the “Ok” button.
In case you’re not sure about how to fill the blanks, you’d better read first about SNMP. Every fields but the “community” one are informative text. You can put whatever you want. Although you should indicate useful information. The “community” entry is some kind of password. This information will be required by the SNMP client process that will connect to the NAS to get the information.
That’s all.
Configure Munin
I will expect you to have an already working Munin server. If you do not have one, you shall read this article.
There was only a missing part for SNMP polling that was solved by adding to correct OpenBSD package:
# pkg_add p5-Net-SNMP-6.0.1p0.tgz
Configuration files
Check that the server’s munin-node allows polling from it’s “public IP”. This
is the IP that shall be used by Munin to connect to the remote NAS. What I did
was:
# vi /etc/munin/munin-node.conf
allow ^192\.168\.0\.5$
Then, configure Munin to poll the NAS. This is done by adding the target to the configuration file:
# vi /etc/munin/munin.conf
[synology]
address 192.168.0.5
Note that the IP is the one from the Munin server, not the NAS one. This is because we are going to poll using SNMP and not the Munin client.
Configure Munin to use the community configured previously. In my case, I use the same community for all of my (not so many) hosts. You may want to configure various community:
# vi /etc/munin/plugin-conf.d/openbsd-packages
[snmp_*]
env.community c0mmunity
Plugins
Run the following command to learn what Munin can do:
# sudo -u _munin munin-node-configure -snmp synology -snmpcommunity c0mmunity -shell
Either pass the "| sh" to the previous command or manually create your links
to modules. There were some Windows related plugins that were proposed ; and
that I didn’t installed.
Reload, wait and see
Everything should be now configured properly. Reload the munin-node and wait
for the poll and the graph to occur:
# /etc/rc.d/munin_node restart
That’s All Folks!