New answers tagged monitoring
To monitor your Linux system's performance locally I would suggest you to read http://www.tecmint.com/command-line-tools-to-monitor-linux-performance/ and http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html
For visual monitoring of overall RAM usage, if you use Byobu, it will keep your memory usage in the lower right-hand corner of the terminal and will run while you are in any terminal session. As you can see from screenshot, my virtual machine has a 1h3m uptime, 0.00 load, has 2.8GHz (virtual) processor and 994MB (21%) of the RAM available on the system.
It will depend on what you pretend to do with it, if is just want to read some info from your system from time to time, there are lots of commands like top (cpu process usage), ps -le (process status), lm-sensors give you a bit more info. Then you have other ones that give you info constantly on your desktop like gkrellm or conky. googling you will find a ...
"What tools do you use to monitor a Ubuntu web server?" I prefer homegrown solutions to the big, bulky packages like Nagios, which have the tendency to inundate my already inundated inbox. I have a little Ubuntu Linux box running on my local network: http://www.newegg.com/Product/Product.aspx?Item=N82E16856119070 It collects information from other boxes ...
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