Zembower, Kevin wrote:
> 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;'
Once you do get a hit, then $1 will stay at the last successful hit, so
you get it printed twice. One way is to
tie with if and success:
print $1 if ( /eth0:(\d+)\s+.*/ );
Will only print if you are successful.
Wags ;)
>
> [EMAIL PROTECTED]:~/rrdmonitoring$
>
>
>
> 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
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