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keychain: Set Up Secure Passwordless SSH Access For Backup Scripts...
Mon, 22 Jun 2009 08:04:17 GMT
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We establish connections to remote systems without supplying a password, however I do not want to store my password less keys ( passphrase-free keys) on my servers. ssh-agent, takes care of keys with passphase, which allowing me to easily have ssh-agent process per system per login session. How do I dramatically reduces the number of times I've to punch my passphrase from once per new login session to once every time my local server is rebooted? How do I use keychain utility for all my backup scripts for secure passwordless login? Answer to "keychain: Set Up Secure Passwordless SSH Access For Backup Scripts" Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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PHP Add Captcha Protection To Web Forms
Wed, 24 Jun 2009 20:12:51 GMT
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I own a small business website. However, bots started to abusing my forms such as contact.php. How do I stop bots bots from abusing my site? How do I tell if PHP form is submitted by a person or a script? Answer to "PHP Add Captcha Protection To Web Forms" Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
Copyright © nixCraft. All Rights Reserved.
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Download Fedora 11 CD / DVD ISO
Thu, 25 Jun 2009 20:54:20 GMT
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Fedora Linux version 11 has been released and available for download ( jump to download link ). Fedora Linux is a community-based Linux distribution. Fedora is sponsored by Red Hat, Inc.
One of Fedora's main objectives is not only to contain free and open source software, but also to be on the leading edge of such technologies. Fedora 11, codenamed "Leonidas", was released on June 9, 2009. The features include ext4, a 20-second startup, and the latest GNOME, KDE and XFCE releases. Firefox 3.5 and Thunderbird 3's latest pre-releases are available as well.
Read more: Download Fedora 11 CD / DVD ISO Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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Increase Your VMware Virtual Hard Disk Size ( vmdk file )
Thu, 25 Jun 2009 20:54:20 GMT
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I've Windows Vista installed as a guest under Ubuntu Linux using VMWARE Workstation 6.0. This is done for testing purpose and browsing a few site that only works with Internet Explorer. Since I only use it for testing I made 16GB for Vista and 5GB for CentOS and 5GB in size for FreeBSD guest operating systems. However, after some time I realized I'm running out of disk space under both CentOS and Vista. Adding a second hard drive under CentOS solved my problem as LVM was already in use. Unfortunately, I needed to double 32GB space without creating a new D: drive under Windows Vista. Here is a simple procedure to increase your Virtual machine's disk capacity by resizing vmware vmdk file. Read more: Increase Your VMware Virtual Hard Disk Size ( vmdk file ) Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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Configure Linux As Bastion Host
Fri, 26 Jun 2009 22:21:47 GMT
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What is bastion host? How do I configure bastion host under Linux? How do I create a firewall for a bastion host under any Linux distribution? Answer to "Configure Linux As Bastion Host" Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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20 Linux System Monitoring Tools Every SysAdmin Should Know
Sat, 27 Jun 2009 22:53:48 GMT
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Need to monitor Linux server performance? Try these built-in command and a few add-on tools. Most Linux distributions are equipped with tons of monitoring. These tools provide metrics which can be used to get information about system activities. You can use these tools to find the possible causes of a performance problem. The commands discussed below are some of the most basic commands when it comes to system analysis and debugging server issues such as:
- Finding out bottlenecks.
- Disk (storage) bottlenecks.
- CPU and memory bottlenecks.
- Network bottlenecks.
Read more: 20 Linux System Monitoring Tools Every SysAdmin Should Know Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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Happy 40th Birthday UNIX!
Mon, 22 Jun 2009 08:04:16 GMT
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UNIX turns 40 - in 1969 group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna developed UNIX. Today Unix offered in many flavors and developed over time by AT&T as well as various commercial vendors (such as IBM, HP, Sun, Apple etc) and non-profit organizations. CW article concluded that after four decades, the future of the operating system is clouded, but its legacy will endure in form of Linux and Microsoft NT operating system. Read more: Happy 40th Birthday UNIX! Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
Copyright © nixCraft. All Rights Reserved.
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Download Of the Day: Firefox 3.5 For Windows, Linux, Mac OS X
Wed, 01 Jul 2009 23:27:36 GMT
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Firefox version 3.5 has been released and available for download. Firefox 3.5 is the fastest web browser. It is twice as fast as Firefox 3. As a result javascript and multimedia enabled web apps loads faster. Firefox is the first browser to support open video and audio formats, allowing practically limitless new ways for sites to display rich content. This is based upon the open formats (HTML 5) which allow displaying media without a plug-in and/or proprietary software.
Read more: Download Of the Day: Firefox 3.5 For Windows, Linux, Mac OS X Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
Copyright © nixCraft. All Rights Reserved.
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UNIX / Linux: Send E-mail When sudo Runs
Wed, 01 Jul 2009 23:27:36 GMT
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I'm not told to use the root user to perform activities that do not require it. I've configured sudo for myself and for other web developers so that they can restart MySQL or Apache web server. How do I send email when sudo run by one of my user? How do I keep track of user login done via sudo command? Answer to "UNIX / Linux: Send E-mail When sudo Runs" Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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Visual Representations Of Linux File Systems
Fri, 03 Jul 2009 02:07:12 GMT
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This is an interesting visualization techniques for software analysis. From the article:
Despite being a very important part of any operating system, file systems tend to get little attention. Linux has three editions for Linux Device Drivers, another three for Understanding the Linux Kernel and two for Linux Kernel Development. The first is a detail analysis of one particular Linux Kernel tree and the second is a shorter one done over a large number of file systems from Linux Kernel 2.6.0 to 2.6.29. After that there is a small section that shows some aspects of the BSD family. After conclusions there is an appendix consisting of three things: the first one explains how the file systems for Linux were compiled, the second one shows timelines for the releases of Linux Kernel, FreeBSD, NetBSD and OpenBSD; the last is a detailed map of the external symbols of the kernel modules analyzed in the second section.
A Visual Expedition Inside the Linux File SystemsRead more: Visual Representations Of Linux File Systems Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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Slowloris DoS Tool: It Can Bring Down Apache 1.x/2.x
Sun, 21 Jun 2009 05:28:57 GMT
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Apache Security Update - a flaw In Apache can be used to carry out DoS. Slowloris is a new Apache DoS tool which can use slow Internet links to bring down Apache servers, rather than flooding networks. Most D/DoS tool requires faster net connections but this tool works with minimal bandwidth. This tool can lead to a DoS attack on Apache 1.x, 2.x, dhttpd, GoAhead WebServer, and Squid, while MS IIS6.0, IIS7.0, and lighttpd are confirmed not vulnerable to this attack. Read more: Slowloris DoS Tool: It Can Bring Down Apache 1.x/2.x Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
Copyright © nixCraft. All Rights Reserved.
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Lighttpd Traffic Shaping: Throttle Connections Per Single IP (Rate Limit)...
Sun, 21 Jun 2009 05:28:57 GMT
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If you do not control or throttle end users, your server may run out of resources. Spammers, abuser and badly written bots can eat up all your bandwidth. A webserver must keep an eye on connections and limit connections per second. This is serving 101. The default is no limit. Lighttpd can limit the throughput for each single connection (per IP) or for all connections. You also need to a use firewall to limit connections per second. In this article I will cover firewall and lighttpd web server settings to throttle end users. The firewall settings can be applied to other web servers such as Apache / Nginx and IIS server behind PF / netfilter based firewall. Read more: Lighttpd Traffic Shaping: Throttle Connections Per Single IP (Rate Limit) Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
Copyright © nixCraft. All Rights Reserved.
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My 10 UNIX Command Line Mistakes
Sun, 21 Jun 2009 05:28:57 GMT
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Anyone who has never made a mistake has never tried anything new. -- Albert Einstein.
Here are a few mistakes that I made while working at UNIX prompt. Some mistakes caused me a good amount of downtime. Most of these mistakes are from my early days as a UNIX admin. Read more: My 10 UNIX Command Line Mistakes Free White Papers Novell: Open Enterprise Server vs. Windows Server "Upgrade or Migrate" Business Case - Your proposal to migrate to a new server has been approved. But wait, which server environment do you select?
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