SUNScholar/Disaster Recovery/System Monitor/Client

Back to Disaster Recovery System Monitor

First click here to create a PostgreSQL credentials file.

Then continue.

Add a firewall rule to allow the monitoring server to get the stats:

ufw allow 4949

Install munin as follows:

Login and become the root user and install the following:

sudo apt-get install munin-node libdbd-pg-perl libxml-simple-perl

Setup munin to allow the monitoring server to gather statistics as follow:

sudo nano /etc/munin/munin-node.conf

Add the following to the file:

allow $IP-ADDRESS-of-monitoring-server%

Note: At SULIS our monitoring server IP address is: 146.232.128.157

Change the following:

host_name %hostname-of-client%

See example below.

# Set this if the client doesn't report the correct hostname when
# telnetting to localhost, port 4949
#
host_name repository.sun.ac.za 

# A list of addresses that are allowed to connect.  This must be a
# regular expression, since Net::Server does not understand CIDR-style
# network notation unless the perl module Net::CIDR is installed.  You
# may repeat the allow line as many times as you'd like

allow ^127\.0\.0\.1$
allow ^146\.232\.128\.157$
allow 146.232.128.157

---

NANO Editor Help

CTL+O	= Save the file and then press Enter
CTL+X	= Exit "nano"
CTL+K	= Delete line
CTL+U	= Undelete line
CTL+W	= Search for %%string%%
CTL+\	= Search for %%string%% and replace with $$string$$
CTL+C	= Show line numbers

More info = http://en.wikipedia.org/wiki/Nano_(text_editor)

---

Run the following command to update stats available:

munin-node-configure --shell | bash -

Restart the local Munin daemon

It is necessary to restart the local munin daemon so that the remote server may connect.

sudo /etc/init.d/munin-node restart

Check which stats are available

cd /etc/munin/plugins

ls -l

Thats it. As usual there is a lot of documentation about Munin out there.

Tips

• http://my.fusioned.net/knowledgebase/22/Munin-MySQL-InnoDB-free-tablespace-WARN.html