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What is VPN and how to use it?

Nov 18, 2015
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Readings, Security

If you’re like most people, you know that there are certain risks involved with being online, especially in public. You’ve heard the stories about hackers exploiting wi-fi networks at coffee shops and hotels, and gaining control of unsecured devices. But you probably haven’t done anything about it.

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How to find PID of a process listening on port?

Nov 12, 2015
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Readings, Tutorials

In Linux, many times, you want to find out the PID of a process which is listening on a port e.g. if multiple apache(httpd) servers are running on a host then, how do you find the PID of the apache(httpd) listening on port 8080?

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Load monitoring in Linux using atop

Jul 16, 2015
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Readings, Tutorials

What is atop?

The program atop is an interactive monitor to view the load on a Linux system. It shows the occupation of the most critical hardware resources (from a performance point of view) on system level, i.e. cpu, memory, disk and network.

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Difference between virtualization technologies (KVM and OpenVZ)

Feb 12, 2015
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Readings

KVM (Kernel-based Virtual Machine) is, on the other hand a full virtualization solution for Linux containing virtualization extensions (Intel VT or AMD-V). Using KVM, one can have Linux and Windows virtual machines running side by side on the same hardware. Each virtual machine has private virtualized hardware: own kernel, a network card, disk, graphics adapter, etc. Since it has its own virtualized hardware, the virtual server will act completely on its own.

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