February 2006 Archives

This is something I've always wondered about but never bothered to try...

ServerName mail.cthought.com ServerAlias mail.*

Basically as we have been providing more and more virtual hosting for email I have been looking for a better way to manage the webmail virtual hosting. Adding a server configuration directive every time I needed to insert a new company name is a little cumbersome. Thankfully Apache does support wildcard records in the serveralias field. Time to play around with this more.

I recently ran into a problem where Cacti was not graphing 10 GigE links on a Cisco 6509 Chassis. A friend of mine recommended a workaround of creating a 64bit graph and then switching the graph to a 95th Percentile after the fact. No matter what I did the system just did not want to properly collect the information. Thanks to the Cacti Forums I was able to resolve the problem by manually altering the rrd file to allow for more data. First you want to check the settings for the rrd file:

# rrdtool info file.rrd ds[traffic_in].max = 1.0000000000e+08 ds[traffic_in].last_ds = "649239500934920" ds[traffic_out].max = 1.0000000000e+08 ds[traffic_out].last_ds = "1154119467695233"

Notice that the last_ds values are larger than what the max supports. I increased this to unlimited with the following command:

# rrdtool tune file.rrd -a traffic_in:U # rrdtool tune file.rrd -a traffic_out:U

And the system is graphing exactly as it should. I need to look into the code and change the default rrd creation from 32bit to 64bit - is there really any reason why you would want it the other way?

# uptime
 6:08AM  up 349 days,  6:17, 2 users, load averages: 2.04, 1.33, 0.69

This machine is running FreeBSD 4.11-Stable, as much as I am tempted to run a make world I just really don't want to reboot it.