Python for Unix and Linux system administration by Noah Gift; Jeremy Jones

Author:Noah Gift; Jeremy Jones
Language: eng
Format: mobi, pdf
Tags: JavaScript, Networking, Programming Languages, Reference:Computers, Electronic books, Computers, Programming, General, Intranets & Extranets, UNIX, UNIX (Computer file), Linux, Python (Computer program language), Python, Operating Systems
ISBN: 9780596515829
Publisher: Farnham : O'Reilly, 2008.
Published: 2008-01-15T08:58:04.918000+00:00

"""Returns Hit Count for Firefox"""

def grep(lines,pattern="Firefox"):

pat = re.compile(pattern)

for line in lines:

if pat.search(line): yield line

def increment(lines):

num = 0

for line in lines:

num += 1

return num

wwwlog = open("/home/noahgift/logs/noahgift.com-combined-log")

column = (line.rsplit(None,1)[1] for line in wwwlog)

match = grep(column)

count = increment(match)

print "Total Number of Firefox Hits: %s" % count

In order for our query to work in the first place, we needed to tell snmpd.conf about this script, and here is what that section looks like:

syslocation "O'Reilly"

syscontact [email protected]

rocommunity public

exec helloworld /usr/bin/python -c "print 'hello world from Python'"

exec .1.3.6.1.4.1.2021.28664.100 FirefoxHits /usr/bin/python

/opt/local/snmp_scripts/agent_ext_logs.py

The magic portion is the last line, in which .1.3.6.1.4.1.2021 is the ucdavis enterprise number, 28664 our enterprise number, and 100 is some contrived value that we decided we wanted to use. It is really important to follow best practices and use your our enterprise number if you plan on extending SNMP. The main reason is that you will avoid causing havoc if you decide to use a range already occupied by someone else and then make changes via snmpset.

We would like to close with the fact that this is one of the more exciting topics in the book, and SNMP is still a very untouched playground. There are many things that customizing Net-SNMP can be useful for, and if you are careful to use SNMP v3, you can do some incredible things that are most easily accomplished through the SNMP protocol; and that ssh or sockets would be the most natural choice.

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