Some time ago I found out about collectd and I was curious to see what it does. collectd collects statistics about the machine its running on - cpu, disk, memory, processes, battery, etc.
Here's how to install it on Ubuntu and visualize the data it has collected.
Step 1: Install the collectd package.
Easy, just install the package:
sudo apt-get install collectd
Step 2: Make sure collectd and apache are running.
If you have installed apache, you should have both collectd and apache running
$ sudo service --status-all | egrep "collectd|apache2" [ + ] apache2 [ + ] collectd
If collectd is not running, run
sudo service collectd start. For me at least, it was running after installation.
Step 3: Install collectd's web app for generating graphs.
Ok, now we have collectd running. collectd is mostly about collecting data and it allows other frontends to display it. However, it comes with a simple set of cgi scripts that can be used to see some graphs.
/usr/share/doc/collectd/examples/ directory, you'll find a directory named
collection3. Copy the entire directory to
$ sudo cp -r ./collection3 /var/www/html.
Step 4: Enable apache to run CGI scripts.
Great, you can now access the cgi scripts by going to this url:
http://localhost/collection3/bin/index.cgi. However, you'll be served a text file, since apache doesn't know to run these cgi scripts. There's is a simple manual explaining cgi scripts in Apache.
You'll have to do two things.
First, you need to install the cgi module. So, go to
/etc/apache2/mods-enabled and run this:
$ sudo ln -s ../mods-available/cgi.load. You have now enabled the
Next you'll have to change
apache2.conf, located in
/etc/apache2 (Ubuntu doesn't use
Add these lines to it:
<Directory /var/www/> Options +ExecCGI AddHandler cgi-script .cgi </Directory>
And - you're done! If you go to
http://localhost/cgi-bin/collection3/bin/index.cgi, you should see some graphs.