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Linux (Red Hat & Fedora Core) Filesystem Hierarchy |
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Written by Administrator
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Tuesday, 03 June 2008 09:25 |
File Systems
Although all the files in your Linux system are connected into one overall directory tree, parts of that tree may reside on different storage devices such as hard drives or CD-ROMs. Files on a particular storage device are organized into what is referred to as a file system. A file system is a formatted device, with its own tree of directories and files. Your Linux directory tree may encompass several file systems, each on different storage devices. On a hard drive with several partitions, you would have a file system for each partition. The files themselves are organized into one seamless tree of directories, beginning from the root directory. For example, if you attach a CD-ROM to your system, a pathname will lead directly from the root directory on your hard disk partition's file system to the files in the CD-ROM file system.
Tip
With Linux, you can mount file systems of different types, including those created by other operating systems, like Windows, IBM OS, Unix, and SGI. Within Linux a variety of files systems is supported, including several journaling systems like ReiserFS and ext3.
A file system has its files organized into its own directory tree. You can think of this as a subtree that must be attached to the main directory tree. The tree remains separate from your system's directory tree until you specifically connect it. For example, a floppy disk with Linux files has its own tree of directories. You need to attach this subtree to the main tree on your hard drive partition. Until they are attached, you cannot access the files on your floppy disk.
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Last Updated ( Tuesday, 03 June 2008 09:31 )
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HOW TO: Automating Cisco Router, Switch, Firewall backups on Fedora |
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Written by Administrator
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Monday, 03 March 2008 06:07 |
Introduction One of the most commonly overlooked aspects of network management is the failure to backup network device configurations. Sadly it is only viewed as being a priority after disaster strikes. Fortunately there is a Linux / Unix open source package called Rancid that can get the job done automatically for most devices that have command prompt method for configuration. The product can be downloaded from the rancid website and has the added advantage of automatically archiving the older configuration versions in a Concurrent Versions System (CVS). This tutorial will show you how to quickly install and configure it for your network backup needs. Rancid Installation Under Fedora Linux, installation is relatively easy, but there are a large number of simple steps to follow. Let's begin: 1. Rancid uses the expect programming language to operate which you will have to install in advance. Use the rpm command with the -q qualifier to determine whether you have expect installed. In this case, it isn't so the yum command is used to do so. [root@bigboy tmp]# rpm -q expect
package expect is not installed
[root@bigboy rancid-2.3.2a2]# yum -y install expect
Repository updates-released already added, not adding again
Repository base already added, not adding again
Setting up Install Process
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[root@bigboy rancid-2.3.2a2]# |
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Last Updated ( Monday, 03 March 2008 06:14 )
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A Complete Guide to Digital Makeover in Photoshop |
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Written by Administrator
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Friday, 29 February 2008 03:47 |
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Fake images are all around us. Almost every fashion model or artist photo is digitally beautified prior to its public release. Sometimes this goes too far and the photos are so fixed that leaves almost no traces of the original natural beauty of the subject being retouched. This digital enhancement of human faces and bodies is called Digital Makeover. It usually involves techniques such as skin smoothing, red eye removal, hair color replacement an so on.
Although at first sight performing a digital makeover over a photo seems to be an advanced task, it may surprise you how easy is to make noticeable changes to faces with a basic knowledge of Adobe Photoshop. This article is a guide of the best digital makeover tutorials and resources around the web and it is not the intention of this post to express a definition of beauty in any sense. It is just a thorough listing of photo retouching techniques for Photoshop. |
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Last Updated ( Friday, 29 February 2008 06:10 )
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How do I limit traffic spanned to SuperAgent on a Cisco 6500? |
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Written by Administrator
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Monday, 03 March 2008 05:57 |
On larger chassis switches, such as the Cisco 6000 and 6500 Series, it is easily possible to exceed the output capacity of the span port. Use of VLAN Access Lists (VACLs) permit the outbound traffic to be significantly reduced.
Below is an explanation about VACLs. It will also include caveats and a checklist to ensure correct functionality.
VLAN ACL (or Security ACL) may be used to copy filtered packets from source VLANS to a destination port.
Hardware and Software Requirements:
- 6000 series switch platform with either CatOS or IOS.
- Policy Feature Cards are required to use this feature since VACLs offload processing from the Supervisor Engine to the PFC. The PFC is included with Supervisor Engines 1A, 2 and Sup720.
- VACL Capture requires CatOS 5.3 or IOS 12.1(8a)EX.
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Capturing Network Traffic for the Catalyst 6000 IDS Module |
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Written by Administrator
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Friday, 29 February 2008 02:59 |
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Date: Feb 15, 2002. The Catalyst 6000 IDS Module is an actual line card that you install in your Catalyst 6000 family switch. This 100Mb Cisco IDS sensor utilizes a monitoring port that captures traffic directly off of the switch's backplane. You must, however, configure your Catalyst 6000 family switch to send the appropriate network traffic to this monitoring port. When deciding how you plan to capture network traffic, you have a choice between two options: - Switched Port Analyzer (SPAN) ports
- Virtual LAN (VLAN) access control lists (ACL) or VACLs
Each of these techniques enables you to pass network traffic to your IDS Module for analysis. The VACL feature, however, provides a much more robust capability to specify the type of traffic that will be passed to your IDS Module. We will examine each of the options separately, beginning with the SPAN port feature. |
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Last Updated ( Friday, 29 February 2008 03:08 )
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