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If you are working as a Linux System Administrator or Linux System Engineer or you are already a Storage Engineer or you are planning to  start your career in field of Linux or you are preparing for any Linux Certification Exam like RHCE or you are preparing for Linux Admin Interview then the the understanding of Concept of RAID become so important for you along with its configuration.RAID can be configured in LINUX or Windows but here we are explaining RAID configuration on LINUX machines.

Each and every Linux user uses the below commands in their day to day system administration activities.

• Ps

• Uptime

• Free

• uname etc.

The above mentioned are few in the long list. The amount of information those commands provide to a user is just outstanding, and is always accurate. But where does these information come from. Another most amazing fact about those commands are that they provide a real time data. Which means each time you run the command, the output will be slightly different.

Nginx is a well known web server, and is adopted by many major players in the industry. The main reason for its fast adoption was that its so fast compared to other web servers (like Apache). Basically nginx was made to solve a problem that is known as c10k. It performs much better than any other web server's in the market out of the box for many. In this article we will see how you can modify your nginx configuration to give it a boost or say performance tune nginx.

We will get inside the configuration part a little later, coz there are quite a few concepts that needs to be understood first.

Whenever you have a problem with any component in your architecture, the first thing that a system administrator does is to go and check the logs related to that application. Because logs can provide you an insight to what problem that application is facing.

If you are responsible for handling only a few handful of servers and applications running on them, then you can simply go and grep the logs to collect information. But imagine a situation, where you have hundreds of servers and you have very different types of applications that run on them. In such cases you cant go and run a tail and then grep or even use awk to format the output in your desired manner.

Before the Linux kernel version 1.3.57, there was no mechanism other than recompiling the kernel, if you wanted to modify some system parameters.

And recompiling the kernel for each and every modification you needed was not at all a good idea. Simply because it didn’t offered flexibility, and it was not possible for a normal day to day user to sit and recompile, a kernel for modifying a value to his required one.

Hence there was a need to provide a user interface, using which a user can easily modify kernel parameters, at run time, without recompiling the kernel. Hence Sysctl was introduced. Before the introduction of sysctl in Linux. Almost all kernel parameters, were defined as constants. However using sysctl you can modify these constants to fit to your needs.

One of the most remarkable achievement in the history of mankind is computers. Another amazing fact about this remarkable achievement called computers is that its a collection of different electronic components, and they work together in coordination to give you a meaningful output. We in our day to day lives use this complex system in one or the other way. But not many of us know how these things work together.

In this tutorial, we will be discussing how a computer boots. I must say how a computer with Linux operating system boots. A couple of days back one of our reader requested us to put this up, as this is a common question asked in interviews. I hope this will be helpful to other readers as well.

All System administrators have their own favorite topics, which they enjoy working with. Its always a nice thing to have a favorite topic of yours because that helps to understand that particular thing in a little more detail, simply because you
are interested. Learning more about a topic that we like is always easier, because its much easier to stick with that topic
and persevere for a long time because we love doing that.

In this article/blog post, i will be discussing an evergreen interesting topic of mine with you guys. Slashroot always welcomes your comments and suggestions because that will help us and others reading the article. In this post we will be discussing "DNS ROOT SERVERS", during the entire discussion we will uncover some of the famous myths that exists in  technology circles even today. If you find any mistake or wrong information in this post, please let us know, so that we can correct it from time to time.

The default shell that most of the Linux distribution provides is bash. Bash stands for Bourne Again Shell. Being a system administrator you need to work with bash in day to day life. Increasing the knowledge of the shell commands and its scripting and programming functionalities will make life much easier.

In this tutorial we will be seeing some interesting shortcuts that you can use while working on any Linux system. The list mentioned here are some of my favourites as well as i believe is a must know for all system administrators out there. Without the knowledge of these shortcuts and some command line tricks, users will find it difficult or sometimes select the long path to achieve certain task.