print barcode in asp.net c# Figure 7-7. loginwindow managed preferences in Font

Creator QR Code in Font Figure 7-7. loginwindow managed preferences

Figure 7-7. loginwindow managed preferences
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CHAPTER 7: Local MCX
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Click the Apply Now button. If you log out, the login window should now reflect the changes you ve made, just like in Figure 7-8.
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Figure 7-8. The login window with managed preferences applied
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If you have other groups of preferences you wish to manage, you can create additional computer groups and attach additional managed preferences to each group.
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Extending the Managed Preferences to Other Machines
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We now have managed preferences working in the local directory service for this particular machine. We certainly don t want to have to repeat all our work on each machine we manage----so how do we deliver these preferences to all the machines we want to manage
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CHAPTER 7: Local MCX
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As it turns out, the data for the local directory service is stored as simple .plist files. (Yes, there they are again----.plist files are everywhere in OS X!) By default, local computer accounts are in /private/var/db/dslocal/nodes/Default/computers/ and local computer groups are in /private/var/db/dslocal/nodes/Default/ computergroups/. For the computer groups, we can just copy the files in /private/var/ db/dslocal/nodes/Default/computergroups/ to all our machines. We can t just copy local_computer.plist from /private/var/db/dslocal/nodes/Default/computers/, however, since, as you might remember, this record has data specific to one machine. NOTE: While it's true that local directory service data is stored in .plist files in Mac OS X 10.5 and 10.6, there's no guarantee Apple will always do this. We're taking advantage of a current implementation detail, but it's one that could change in the future. For the local_computer account, we ll have to use a different strategy. In 5, we used the dscl command to create a local_computer account. We ll do that again now, but in a script:
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#!/bin/sh GUID="15BEE70A-A32D-4A33-B740-93CBE95F75A4" /usr/bin/dscl . -create /Computers/local_computer /usr/bin/dscl . -create /Computers/local_computer RealName Local Computer /usr/bin/dscl . -create /Computers/local_computer GeneratedUID $GUID /usr/bin/dscl . -create /Computers/local_computer ENetAddress $(ifconfig en0 | awk '/ether/ {print $2}')
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You must run this script at least once on each machine you wish to manage in order to create a working local_computer account. You can run it more than once without problem; I actually have it set to run at each startup. This script performs the equivalent of what we did earlier with Workgroup Manager, with one key difference. Instead of allowing the computer to create a GeneratedUID, we re populating this field with a specific value. The specific value itself doesn t matter; but it must match the GeneratedUID of the local_computer account you used when creating your computer groups and their managed preferences. This is because the GeneratedUID of the local_computer account is stored in the computer groups as part of the membership information. Look at the GroupMembers attribute here:
> dscl . read /ComputerGroups/loginwindow AppleMetaNodeLocation: /Local/Default Computers: local_computer GeneratedUID: F4E181C7-5BFD-4572-9BBB-F659588FD74D GroupMembers: 15BEE70A-A32D-4A33-B740-93CBE95F75A4 GroupMembership: local_computer PrimaryGroupID: 1030 RealName: loginwindow RecordName: loginwindow RecordType: dsRecTypeStandard:ComputerGroups
CHAPTER 7: Local MCX
The name and GeneratedUID for the local_computer account must match the GroupMembership and GroupMembers in the local computer groups for the membership to work correctly. In case you are a bit worried that we are using the same GeneratedUID on multiple machines, don t worry. These objects will be used only in the local directory node, which is not visible to other machines----it s seen only by the local machine. Making the GeneratedUIDs consistent across all the machines you manage makes things easier on you, the administrator.
Local MCX Checklist
You ll need three things to use managed preferences in the local directory service: Computer group .plist files copied from /private/var/db/dslocal/ nodes/Default/computergroups/ A script to create the local_computer account A way to deliver the first two items to each machine
With any luck, that last item isn t a showstopper. If you manage multiple OS X machines, you probably have a way to deliver software or at least copy files to each machine you manage. Some commercial software packages that can help you with this include the following:
Apple Remote Desktop: www.apple.com/remotedesktop/ Casper Suite: www.jamfsoftware.com/ FileWave: www.filewave.com/ KACE Management Appliance: www.kace.com/ Absolute Manage (formerly LANrev): www.lanrev.com/
There are open-source options as well: Puppet (www.puppetlabs.com/) and Radmind (http://rsug.itd.umich.edu/software/radmind/) are among the most popular. If you are an experienced UNIX hand, you can get away with nothing more than the commandline scp utility, which securely copies files to remote machines.
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