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In part 1, we covered what Suricata is, why we are using it, and how to install it to our system. It wasn’t hard, and the following won’t be much worse, either. Now we are going to do some basic configuration of the program and get it working!

Allocation is setting aside, or reserving, space for use. On a computer, it is setting aside the space on a hard drive for use to store files. The files can be newly created or those being modified. Each file system supports one or more different allocation methods and many types of allocation methods exist.

If you haven’t heard yet, Source Fire is being bought by Cisco for ~$2.7b. While I love Source Fire and their product line, Cisco leaves a sour taste in my mouth. With that said, I decided to write a series of articles talking about Suricata. That wonderful program that will no doubt gain a lot of traction in the IDS/IPS community since the eventual end of Source Fire is coming along.

The next portion of the kernel that is configured is the IRQ subsystem. An Interrupt ReQuest (or IRQ) is a signal from the hardware to the processor to temporarily stop a running program and allow a special program to execute in its place.

The DMAPI is an interface used by the XDSM specification which allows for special interfaces to the files. The interface is file system independent, meaning that someone who creates an interface can use it on any DMAPI file system.

Often times, a computer user will delete a needed file accidentally and not have an easy way to regain or recreate the file. Thankfully, files can be undeleted. When a user deletes a file, it is not gone, only hidden for some time. Here is how it all works.

Linux users may get bored of the system sounds and wish that they could change them. Thankfully, users can customize the sounds and download more. There are numerous Linux system sounds on the Internet that are free and legal to download.

Once quotas are set, the file system tracks the amount of data written by each user and group. Every time a user creates, modifies or deletes a file, the used amount is updated. When a user or group attempts to change or add a file which will cause the quota to be exceeded, a message appears to warn the user that the disk is full.

Configuring code for the kernel does take a lot of time. The configuration tool asks many questions and allows developers to configure every aspect of the kernel. If unsure about any question or feature, it is best to pick the default value provided by the configuration tool. This tutorial series will walk readers through the whole process of configuring the kernel.

B-Trees are used to help search various data. Some file systems use B+Tree to search directories, extent descriptors, file allocation and even file retrieval. In the future, B+Tree may be used to search through more types of data within the file systems.

Newer file systems try to keep files from becoming fragmented. Hard disk performance declines with fragmentation. When files are not placed in contiguous blocks, file fragmentation occurs. When a file is spread out over the hard disk, the hard drive "appears" to be slow to the user. The hard drive has to wait for the disk to spin to maneuver the read/write heads over the correct sectors. The lag time causes most users to believe the system is slowing down. The problem is not the computer, but the hard disk.

Many people know about compression by compressing a file to make it smaller for e-mailing. Others compress files to place on a small storage device such as a USB thumb drive or memory card. In these instances, a file utility is used to compress the data into a compressed format such as ZIP, RAR, TAR, and others.

Some file systems allow for native snapshots and cloning. The two have one difference, but otherwise are the same. The only difference between a snapshot and clone is that the snapshot is read-only, while the clone allows for reading and writing.

This is an article on how to install and use mod_geoip2 in cpanel. The short version is that you download it, extract it into the easyapache custom modules directory, then run easyapache to enable it. Read on for the detailed version.

If you don’t have a need for certain international visitors to your Linux server, its easy to block them out! First, you’ll need to make sure that CSF is installed. Once that’s done, read on to block access from Russia, China, etc..

The first thing on your mind when setting up a new Linux server (dedicated or VPS) is how you can increase security. One of the best tools in your bag of tricks should be the CSF (ConfigServer) LFD (Login Failure Daemon) firewall.

NAS Storage Performance Testing Using DD Command

In this article I will show you the power linux dd command to analyse NAS storage performance (throughput). dd command basically copies a file (from standard input to standard output, by default) with a changeable I/O block size , using specific input and output block sizes. Here we are using dd command to test the throughput of NAS nodes that is attached to the linux server.

In 1991, a Finnish student named Linus Benedict Torvalds made the kernel of a now popular operating system. He released Linux version 0.01 on September 1991, and on February 1992, he licensed the kernel under the GPL license. The GNU General Public License (GPL) allows people to use, own, modify, and distribute the source code legally and free of charge. This permits the kernel to become very popular because anyone may download it for free. Now that anyone can make their own kernel, it may be helpful to know how to obtain, edit, configure, compile, and install the Linux kernel.

Ever have to check a list of Linux servers for various things like what version of CentOS they’re running, maybe how long each has been running to get an uptime report? Maybe you want to block an IP in CSF on all of your Linux servers at once? You can – and it’s very easy to get going with it.

If you are using nagios in your hosting environment and need to install nrpe on your XenServer servers, here’s a good way to do it.