In our last post, we looked at some of the basics of CIM technology and a very basic script that can dump out the version of ESX the system is running. Now lets take a deeper dive into some of the hardware asset information that's available.
Before we look at the code, lets talk a little about where this data comes from. The data we'll be looking at in this installment comes from SMBIOS, which is an industry standard extension to BIOS that exposes basic system management information. Just about every system you can buy these days has some amount of SMBIOS information available. Some examples of SMBIOS information are CPU details, memory modules, and chassis information. This information maps into a number of SMASH profiles, such as DSP1022 – CPU profile, DSP1026 – System Memory Profile, and DSP1011 – Physical Asset Profile.
In this example, we'll start to abstract thins out a little more so we can start to build some reusable parts for future examples. The three classes we'll look at are OMC_Processor, OMC_PhysicalMemory, and OMC_Chassis.
#!/usr/bin/env python
# First import the various python modules we'll need import pywbem import os import sys from optparse import OptionParser
# Simple routine to display an instance def printInstance(instance): print instance.classname for propertyName in sorted(instance.keys()): if instance[propertyName] is None: # skip over null properties continue print '%30s = %s' % (propertyName, instance[propertyName])
# Simple function to dump out asset information def dumpAssetInformation(server, username, password): client = pywbem.WBEMConnection('https://'+options.server <https://%27+options.server> , (options.username, options.password), 'root/cimv2') list = [] for classname in ['OMC_Chassis', 'OMC_PhysicalMemory', 'OMC_Processor']: list.extend(client.EnumerateInstances(classname)) if len(list) == 0: print 'Error: Unable to locate any instances' else: for instance in list: printInstance(instance)
if __name__ == '__main__': # Some command line argument parsing gorp to make the script a little more # user friendly. usage = '''Usage: %prog [options] This program will dump some basic asset information from an ESX host specified by the -s option.''' parser = OptionParser(usage=usage) parser.add_option('-s', '–server', dest='server', help='Specify the server to connect to') parser.add_option('-u', '–username', dest='username', help='Username (default is root)') parser.add_option('-p', '–password', dest='password', help='Password (default is blank)') (options, args) = parser.parse_args() if options.server is None: print 'You must specify a server to connect to. Use –help for usage' sys.exit(1) if options.username is None: options.username = 'root' if options.password is None: options.password = ''
