My free trial period of my Smart Machine ended, so now I was trying to find a way to monitor my bandwidth usage on my Smart machine. There isn’t a “easy” way of doing (like logging in to the portal to look at your account) so I devised a way to do it on my own.<\/p>\n
The first part of it will be discussed in this post, and I will do another about how to actually view the results.<\/p>\n
First off the easiest way I have found to “watch” network traffic is using the kstat command. On my SmartMachine, I have 2 network interfaces, one that has the public interface on it, and one that has the private interface on it. For my purposes I am only currently watching “net1” which is the external interface.<\/p>\n
So the small script I have runs every 10 minutes, and logs the information in to a MySQL table. That table is defined like this:<\/p>\n
interface: which interface we are getting the stats from, right now everything just says net1. But if I were to add net0 it would fit right in.<\/li>\n
time: time in seconds since the epoch<\/li>\n
obytes: bytes leaving the interface<\/li>\n
rbytes: bytes received on the interface<\/li>\n
htime: human readable time. (Yes i realize I am storing the time twice, and that I can do everything with just time, but what the heck, it is just an extra little storage ;-)…<\/li>\n<\/ul>\n
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Now that the table in the DB is defined, set the permissions on it. In my case I created a database just for the “netstats” ?and there is just the one table in it called vmnet. I created 2 users that have access to the vmnet table. One just for writing the data in from the script, and another for reading the data for part 2 of this.<\/p>\n
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Now for the script, it is pretty simplistic: \n \n#!\/bin\/bash \n#Use kstat to grab interface stats \n#Define the interface to look at: \nINTF=\"net1\" \nVALUES=\"`kstat -c net -n ${INTF} | egrep \\\"(obytes64|rbytes64)\\\"`\" \nSNAPTIME=\"`perl -e \\\"print(time());\\\"`\" \nOBYTES=\"`echo ${VALUES} | grep obytes64 | awk '{print $2}'`\" \nRBYTES=\"`echo ${VALUES} | grep rbytes64 | awk '{print $4}'`\" \necho \"insert into vmnet values ('${INTF}',${SNAPTIME},${OBYTES},${RBYTES},NOW());\" | \/opt\/local\/bin\/mysql -uUUUUUU -pPPPPPPPPP netstats \n<\/code><\/p>\n
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In the most?simplest?form, the script runs the kstat command on the requested interface ${INTF} and then uses egrep to grab the obytes64 and rbytes64. It then takes those to values and creates a sql insert and piles that in to mysql command where UUUUUU is the username and PPPPPPPP is the password for the insert use on the netstats database.<\/p>\n
I then run this every 10 minutes. And what you end up with is data in the table that looks like this:<\/p>\n
![\"graph](\"http:\/\/blogs.sungeek.net\/unixwiz\/wp-content\/uploads\/2014\/01\/Screen-Shot-2014-01-23-at-9.54.55-PM.png\")
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