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- Close unneeded ports on Unix/Linux systems
- Earlier this month, I provided some tips on how to use netstat and other tools to list open ports and listening services on a number of different operating systems. As pointed out in the previous article, "10 security tips for all general-purpose OSes," shutting down unnecessary services (and closing...
- Tags: grep, ppp, network, linux system, service, unix, tool, linux, servers, networking, operating systems, open source, software, hardware, chad perrin
- Blog posts 2008-04-23
- Using OpenPGP on UNIX/Linux systems with GnuPG
- PGP is the name of an encryption program created in 1991 by Philip Zimmerman. Since then, PGP has become the dominant model for personal privacy encryption software. In July 1998, PGP Inc. proposed an OpenPGP standard to the IETF. This standard would provide guidance for creating personal...
- Tags: freebsd, linux system, debian, key, pgp corp., gnupg, openpgp working group, rfc 2440, tools & techniques, operating systems, open source, linux, unix, management, software, chad perrin
- Blog posts 2008-02-14
- Restrict users' access on Linux systems
- In a recent article, "Force users to log off when their time is up," I told you how to force home and workgroup users to log off at a specific time by using a third-party utility. But this solution targeted Windows machines, and one of my loyal readers asked how...
- Tags: linux system, user, pluggable authentication module, linux, security, unix, open source, operating systems, networking, software, mike mullins
- Blog posts 2007-10-11
- Restrict users' access on Linux systems
- This looks really useful!Wow, Thanks for posting this great info! I just logged into my machine and read /etc/security.time.conf file. The format seemed really weird. The concept is very similar to crontab entries. I'm really excited about having just learned about this but since their just me on local system;...
- Tags: open source, adambrown29@..., service name, linux system, linux
- Discussion threads 2007-10-11
- Linux System Programming: Advanced File I/O
- This white paper looks at the more advanced I/O system calls that Linux provides. The paper concludes with a discussion of performance considerations and the kernel's I/O subsystems. It discusses various facets of advanced I/O, from the more-powerful-but-more-complex I/O system calls to optimization techniques and the dreaded performance-sucking disk seek.
- Tags: linux, performance, i/o, linux system
- Book chapters 2007-09-01
- Email server backup
- Im loosing my mind here.I currently am using a FEDORA CORE linux email server.Problem: I need received & sent emails of all employees to be backed up.All employees use Windows operating system. I need to be able to give them their sent and received emails anytime on demand. What do...
- Tags: operating systems, unix, microsoft windows, open source, davedxb, e-mail, linux, email server, server, backup
- Discussion threads 2007-08-24
- Software Company Extends Windows-Based Authentication to Linux Systems
- Tecplot is a visualization software company based in Bellevue, Washington, whose programs run on multiple computing platforms. The company's data center includes platforms running the Windows, UNIX, and Linux operating systems, used for development and testing. However, securing and managing user access to the multiple Linux systems was inconsistent and...
- Tags: user access, linux system, authentication, tecplot, linux, microsoft windows, operating systems, unix, open source, software
- Case studies 2007-06-01
- Deploying Linux Systems With Tivoli Provisioning Manager for OS Deployment
- This paper describes how to get a bare metal machine work with a Linux operating system using one of the main features of Tivoli Provisioning Manager for OS Deployment: the deployment of a profile. The paper also creates software packages that are automatically installed on the target computer after the...
- Tags: operating system, linux system, provisioning, ibm corp., linux, operating systems, open source, software
- White papers 2007-05-15
- How do I determine word size on a Linux system?
- I write a software package that has to run on a variety of Linux systems. Which files are installed depend upon whether the system uses 32- or 64-bit architecture. I haven't found a reliable way to determine the word size of the current machine. Is there a...
- Tags: 64-bit, open source, rick@..., linux system, linux
- Discussion threads 2007-04-14
- Save the penguins with Linux?
- The British government recently claimed that systems running Linux are greener than those running Windows operating systems. Why? Quite simple—a report by the US Department of Government Commerce claims that comparing equivalent systems running on Linux and Windows, the Linux systems will require less memory and slower processors...
- Tags: general, microsoft, environment, government, open source, windows vista, linux
- Blog posts 2007-03-26
- Master the basics of Linux system administration
- Since 2001, the first edition of the Linux Administration Handbook has been a definitive resource for Linux system administrators who must efficiently solve technical problems and maximize the reliability and performance of a production environment. The second edition addresses today's most important Linux distributions (such as Red Hat...
- Tags: administration, linux system, linux, unix, open source, operating systems, software
- Book chapters 2007-02-27
- Read input and manipulate files on Linux systems with PHP scripts
- Why PHP?I really do not understand why someone would be using PHP for this purpose. PHP reads and feels like a less powerful version of Perl, without CPAN to boot. My experience has been that what makes PHP useful is not the language itself (which i
- Tags: software, linux, justin james, php, linux system, perl
- Discussion threads 2006-11-07
- Read input and manipulate files on Linux systems with PHP scripts
- If you are already familiar with PHP code for Web sites, then you'll find it works great for command-line scripting on Linux systems. Gone are the days when Perl was the first-choice interpreted language for command-line scripting on Linux systems. These days, a number of choices are...
- Tags: php, linux, vincent danen, scripting languages, linux system, linux tips newsletter, software/web development, web development, operating systems, software
- Technical articles 2006-11-03
- Troubleshoot storage performance problems in your Linux system
- SANs are growing in popularity because they assist with storage consolidation and simplification. And the main discussion point within the computing industry with regards to storage consolidation has always been performance. Explore different approaches to isolating a storage performance problem in your Linux system in this sample chapter from...
- Tags: performance, linux system, prentice hall inc., performance management, linux, storage, human resources, workforce management, operating systems, software, hardware
- Book chapters 2006-11-01
- Customize the look and feel of your Linux system
- If you've ever suffered GUI fatigue--the visual boredom that results from looking at the same old icons, window borders, and color schemes on your desktop day in and day out--you may appreciate one of Linux's unique features: the ability to change the basic look and feel of your system without...
- Tags: window, linux system, linux, construction, unix, operating systems, open source, software
- Book chapters 2006-10-18
- Take the seven necessary steps to a more secure Linux system
- Beyond sevenObviously there are more than seven steps to securing a Linux system, what other steps would you suggest?Services option inetd / xinetdNot just disable the unwanted services.configure those that only require local access to not be visible externally.those that are only occasionally needed put into inted or xinetd, so...
- Tags: linux, linux system, mark w. kaelin, network administration, network security, networking, server, super server
- Discussion threads 2006-10-13
- Take the seven necessary steps to a more secure Linux system
- Ask a network administrator in any large organization tocompare Linux with network operating systems like Windows NT or Novell, andchances are he'll admit that Linux is an inherently more stable and scalablesolution. Chances are he'll also admit that when it comes to securing thesystem from outside attack, Linux is possibly...
- Tags: contributor melonfire, firewall, linux, linux system, network, password
- Technical articles 2006-10-13
- Enable password aging on Linux systems
- moderately inconvenient for users?Everybody who is working in a larger environment knows by now that "moderately inconvenient for users" basically means huge headaches especially if you have no single-sign-on environment in place. I personally maintain more then 30 passwords. Changing them on a regular basis means weaker passwords, more desktop...
- Tags: security, password, bernd@..., networking, linux, linux system
- Discussion threads 2006-09-13
- Enable password aging on Linux systems
- Vincent Danen shows you how to enable password aging--a mechanism that allows you to enforce your password policy for users. Password aging is a mechanism that allows the system to enforce a certain lifetime for passwords. While this may be moderately inconvenient for users, it ensures that...
- Tags: linux, vincent danen, linux system, password, linux tips newsletter
- Technical articles 2006-09-11
- Remote shutdown in linux
- hi, i am not so good in linux bu am working with more that 270 linux system where some people are not shuting down and linux is crashin down and has to be restared and the performance is going down so i want to schedule an remote shutdown can anybody...
- Tags: unix, operating systems, open source, linux
- Discussion threads 2006-08-10
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