System Administration: Maximizing Linux Security: Part 2
The network should be examined for potential security problems on a regular basis just like the local system. The once notorious Satan program provides one way of doing so. Satan is designed to look for network vulnerabilities from the outside in. It looks for a variety of problems, including:
The availability of notoriously insecure network services, such as rexd and old versions of sendmail.
The setup of any ftp and/or tftp facilities.
A variety of NFS vulnerabilities.
X server vulnerabilities.
For those concerned about the misuse of such a powerful tool, the Gabriel and Courtney packages attempt to detect suspicious uses of Satan itself.
We've covered a wide variety of threats to system security in this article. Don't let the sheer number of them overwhelm you. All you can do is protect your system as well as is currently possible and make frequent backups so that you can recover quickly in the event that your best efforts are not enough. Remember that system security is an ongoing process, not something you can take care of once and then forget about. And as in all of life, there are no guarantees.
Æleen Frisch (email@example.com) manages a very heterogeneous network of Linux and other UNIX systems and PCs. Having recently finished second editions of two books, she looks forward to pursuing her true calling: pulling the string for her cats, Daphne and Sarah.
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.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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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
- SuperTuxKart 0.9.2 Released
- Google's SwiftShader 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