I'm trying to capture the number of bytes transmitted and received on my
eth0 interface for use with RRD. I'm using this source for the data:
[EMAIL PROTECTED]:~/rrdmonitoring$ cat /proc/net/dev
Inter-| Receive |
Transmit
face |bytes packets errs drop fifo frame compressed multicast|bytes
packets errs drop fifo colls carrier compressed
lo:31738431 323299 0 0 0 0 0 0
31738431 323299 0 0 0 0 0 0
eth0:147992894 45634695 0 0 0 0 0 0
1722980290 70429910 0 0 4 0 0 0
sit0: 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
[EMAIL PROTECTED]:~/rrdmonitoring$
When I try to grab just the number of received bytes on eth0, it
duplicates the number:
[EMAIL PROTECTED]:~/rrdmonitoring$ cat /proc/net/dev|perl -ne
'/eth0:(\d+)\s+.*/; print $1;'
[EMAIL PROTECTED]:~/rrdmonitoring$
Note that the number repeats after 9 digits. Any ideas why?
Any suggestions on how to improve my script overall? I'm actually
reduced to doing this, to grab the received and transmitted bytes:
[EMAIL PROTECTED]:~/rrdmonitoring$ rrdtool update /var/log/rrd/wwweth0.rrd
N:`cat /proc/net/dev|perl -ne 'm[eth0:(\d+).*]; print "$1";'`:`cat
/proc/net/dev|perl -ne 'm[eth0:(\d+\s+){9}(\d+).*]; print "$1";'`
ERROR: expected 2 data source readings (got 0) from 1735196319:...
[EMAIL PROTECTED]:~/rrdmonitoring$
What I'd really like to do is just run the perl script once and return
both values. The only way I know to interface this with rrd is to assign
each of the values to shell variables, and I don't know how to do this
within perl or in the shell.
Thanks for your suggestions.
-Kevin Zembower
