Python RRD

# apt-get install python-rrdtool

# rrdtool create traffic.rrd --start 1340723000 --step 300 \
DS:input:COUNTER:600:U:U \
DS:output:COUNTER:600:U:U \
RRA:AVERAGE:0.5:1:600 \
RRA:AVERAGE:0.5:6:700 RRA:AVERAGE:0.5:24:775

#!/usr/bin/python

import rrdtool
import sys
import re
import time

proc = '/proc/net/dev'
iname = 'eth0:'

infile = open(proc, "r")
while infile:
  line = infile.readline()
  if len(line) == 0: 
    break       
  index = line.find(iname)
  if index > 0:
    trafficinfo=line[index+len(iname):]
    items = re.split(" +", trafficinfo)
    inbyte = items[0]
    outbyte = items[8]

uptime = int(time.time())
rtv = rrdtool.update('traffic.rrd',  "{0}:{1}:{2}".format(uptime,inbyte, outbyte))

starttime = time.time() - (3600 * 24)
rtv = rrdtool.graph('traffic.png',
  '--imgformat', 'PNG',
  '--width', '540',
  '--height', '100',
  '--start', "%i" % starttime,
  '--end', "-1", 
        '--vertical-label', 'Traffic',
        '--title', 'Input/Output Traffic',
  'DEF:input=/var/www/moniwiki/script/traffic.rrd:input:AVERAGE',
  'DEF:output=/var/www/moniwiki/script/traffic.rrd:output:AVERAGE',
  'LINE1:input#990033',
  'LINE1:output#FF0000'
  )