centosmonitoringsoftware-rec
The dedicated server I'm looking after started to crash occasionally, I suspect because of overload, so I need some performance/resource based monitoring software, preferably with web interface, something like OpenNMS which I have tried, but did not like. The OS is Linux CentOS 5.3
P.S. There over 50 websites running on the server, if the monitoring software could show which one is consuming most resources that would be most helpful.
You can use iptables to mark a packet (--pid-owner ...), then use tc to shape the traffic.
Also "--sid-owner" can be used to include threads and children of that process.
http://www.frozentux.net/iptables-tutorial/iptables-tutorial.html#OWNERMATCH
Match --pid-owner
Kernel 2.3, 2.4, 2.5 and 2.6
Example iptables -A OUTPUT -m owner --pid-owner 78
Explanation This match is used to match packets based on the Process ID (PID) that was responsible for them. This match is a bit harder to use, but one example would be only to allow PID 94 to send packets from the HTTP port (if the HTTP process is not threaded, of course). Alternatively we could write a small script that grabs the PID from a ps output for a specific daemon and then adds a rule for it. For an example, you could have a rule as shown in the Pid-owner.txt example
ntop is probably your best solution for doing this. It is designed to run long term and capture exactly what youre looking for.
It can show you what remote destinations are being used the most, how much traffic sent to/from, what protocols and ports were being used etc. It can do the same for the source hosts if you run it on a router so you can see the same stats on local clients as well.
It then uses a web GUI to navigate and display this information.
Best Answer
There are a lot of answers. I personally use Zenoss, but there's a big list here: http://en.wikipedia.org/wiki/Comparison_of_network_monitoring_systems