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Launchd Jobs: Apple s launchd replaces the time-honored Unix cron
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daemon for job management. Actually, it replaces much more, with the ability to start jobs based on time (cron), to start jobs by listening to a socket (inetd), or to restart crashed jobs automatically (watchdog). Launchd is an excellent----and preferred----way to start jobs automatically at boot or based on the aforementioned criteria.
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cron and periodic: Even though launchd can replace the functionality
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of these traditional UNIX tools, if you are a seasoned UNIX administrator and comfortable with cron and periodic, they are still available and useful for running scripts on a repeating basis. However, cron and periodic have definite weaknesses when it comes to machines that may be off or asleep from time to time----if it s vital that a task run on a periodic basis, using launchd is a better choice.
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CHAPTER 1: Why Manage
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This huge array of choices and options may be daunting, especially if you are new to managing OS X machines! Using Apple s Managed Preferences gives you a solid framework in which many of the previous challenges have been solved for you. NOTE: Using Apple s Managed Preferences tools may not free you entirely from the need to write scripts. In fact, in all likelihood, for a complete client management solution, you ll almost certainly need to use a combination of tools. Apple s Managed Preferences are just one more tool in your toolbox.
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Managing Everything Else
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Apple s Managed Preferences won t help you install software, or update the OS, or count the number of machines that have Photoshop installed, or manage software licensing. For those tasks, and others not mentioned here, you ll need to use other tools. We ll mention other tools at various places in this book, but here s a brief list of some of the more popular tools related to client management on OS X. These tools each have their own feature sets, but all cover some other elements of client management.
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Apple Tools
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Apple Remote Desktop If you have no other management tool at your disposal, consider this one. A jack-of-all-trades, it combines remote screen sharing with report generation, remote software installation, and more. Apple Software Update Server Part of OS X Server, this allows you to mirror Apple updates on a server inside your organization, saving the bandwidth costs of all your clients going out over the Internet to Apple s servers for updates. You can also choose to approve updates individually.
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Open-Source Tools
Puppet www.puppetlabs.com/ Open-source systems configuration management Radmind http://rsug.itd.umich.edu/software/radmind/ Filesystem management; used on OS X to install and remove software, and ensure the startup disk is always in a known state.
CHAPTER 1: Why Manage
Third-Party Commercial Software
Casper Suite www.jamfsoftware.com/ FileWave www.filewave.com/ KACE Management Appliances www.kace.com/ LANrev www.lanrev.com/
This is not an exhaustive list. There are many more tools available, both open-source and commercial. All of these third-party packages do software installation and OS patch management. Some also support software inventory and license management. See each vendor s web site for more information. A special mention for the Casper Suite: one of its many features is that it can provide a way to distribute managed preferences to client machines without needing an Open Directory server and without modifying an Active Directory or third-party LDAP service.
Summary
There are many reasons for wanting to manage a fleet of computers, and there are many ways to perform that management with Mac OS X. This chapter touched on just a few. While full management will likely require utilizing several methods at your disposal---Managed Preferences, scripting, and so on----Apple supplies the Managed Preferences system that is built right into Mac OS X, which is the focus of this book. If you haven t yet looked into formal management of the machines in your purview, once you have, you ll wonder how you ever got along without it.
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