Paranoid Penguin - Single Sign-On and the Corporate Directory, Part II
for the different rights, you'll enable those users in the ldap-admins group to be administrators on that machine. These rights are different from sudo privileges, which are defined in /etc/sudoers. These rights control rights to tasks such as installing software and modifying system preferences.
At this point we should be able to log in as user leggett. Tiger's sshd supports both GSSAPI mechanisms, gssapi and gssapi-with-mic. Previous OS X versions supported only gssapi, so a password was required when logging in to or from an OS X client. SSO support is enabled out of the box for sshd, so there's no config files to edit.
As I stated earlier, with v10.4, almost all of OS X's built-in services and applications are Kerberized, including Apple's Mail.app. If you're running your own CA or using self-signed certificates, you need to import your CA's certificate into the System keychain first, so Mail.app won't complain when connecting to self-signed SSL-enabled services like IMAP and SMTP. Copy the CA cert to the OS X client and then run certtool:
sudo certtool i ci-cert.pem v \ k=/System/Library/Keychains/X509Anchors
Now you're ready to start Mail.app. The trick to enabling GSSAPI during the account creation process is to fill in the user name and leave the password blank. If you don't already have valid credentials, it will prompt you for your Kerberos password. Once the account is created, go back and enable SSL for IMAP. By default it's not enabled, and Mail.app doesn't give you the choice at account creation time.
All versions of OS X since v10.3 ship with a GUI application for managing Kerberos credentials named Kerberos.app (Figure 4), but it's buried in /System/Library/CoreServices. You can add this useful app to your dock and have it start at boot. It can automatically renew your credentials when they're expiring and easily show you how much longer your credentials are valid, among other useful features.
Many of Apple's services and applications are fully Kerberized, including Safari, VPN, Xgrid and AFP, making your Apple users and administrators first-class citizens in your network.
By now you're probably starting to realize the enormous potential of LDAP directories and Kerberos authentication. You have a powerful and scalable infrastructure as well as clients making full use of it. In my next article, we'll discuss how to integrate in one more type of client, Microsoft Windows. Until then, enjoy the fruits of your labor!
This work was supported by the Mathematical, Information, and Computational Sciences Division subprogram of the Office of Advanced Scientific Computing Research, Office of Science, U.S. Department of Energy, under Contract W-31-109-ENG-38. Additional support has been provided by the Computation Institute at the University of Chicago and the National Science Foundation under Grant SCI: 0451491.
Resources for this article: /article/8636.
Ti Leggett (firstname.lastname@example.org) is a systems administrator for the Futures Laboratory of the Mathematics and Computer Science Division at Argonne National Laboratory. He also has a joint appointment with the Computation Institute at the University of Chicago.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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|The Firebird Project's Firebird Relational Database||Jul 29, 2016|
|Stunnel Security for Oracle||Jul 28, 2016|
|SUSE LLC's SUSE Manager||Jul 21, 2016|
|My +1 Sword of Productivity||Jul 20, 2016|
|Non-Linux FOSS: Caffeine!||Jul 19, 2016|
|Murat Yener and Onur Dundar's Expert Android Studio (Wrox)||Jul 18, 2016|
- The Firebird Project's Firebird Relational Database
- Stunnel Security for Oracle
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Managing Linux Using Puppet
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Doing for User Space What We Did for Kernel Space
- Google's SwiftShader Released
- SuperTuxKart 0.9.2 Released
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide