Monitoring data with Munin and stressing the system
This installation was performed following the instractions by Tero Karvinen (http://terokarvinen.com/2011/munin-monitors-your-ubuntu-linux-one-step-install).
Installing Munin
sudo apt-get update
First things first. By running the command I received the latest packages and ensured the correct functionality of programs.
sudo apt-get -y install munin
'sudo software-properties-gnome'
I gave the installation command for Munin and enabled universe repository so I could actually run it. At this stage Mumin should be already monitoring the system.
firefox /var/cache/munin/www/index.html
After entering Munin's location via Firefox I chose to view information of disk space usage. Naturally there was no data yet - Munin updates itself every 5-10 minutes.
Stressing the system
I installed iotop which is a program specified gathering information of the processes stressing a computer.
sudo apt-get -y install stress
stress
After installing and running the program's (stress) name I didn't only get a small manual of the functions but also an example code I could use to stress the system.
I modified the example code and increased the values of vm-bytes and timeout. After running it my computer started humming and I could not get any response for a while because of the long timeout I generated. I opened a new Terminal window and ran iotop.
sudo iotop -oa
Here is a comparison before and after launching the stress. I was able to monitor how stress was opening and running processes by itself.
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| Before and after stress |
Monitoring with Munin
After returning to check if Munin had gathered enough information I noticed a long spike in the diagram. I could see some unused memory and made a note that applications I had used took about half of it.
Log analysis
cd /var/log/
tail syslog
On September 8, 16:51:30 (UTC), Xubuntu gave a command which was invalid since the system did not have enough memory. The process was killed.
Sources: Lectures by Tero Karvinen, http://terokarvinen.com/2011/munin-monitors-your-ubuntu-linux-one-step-install
Based on Linux course by Tero Karvinen (http://terokarvinen.com)
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