Xen Virtualization and Cloud Computing #05: The Xen Project, Unikernels, and the Future

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Previous articles in this series introduced virtualization, described how Xen achieves it through its architecture and key features, and described other platforms with which Xen interacts. This article wraps up the series by describing some exciting advances in virtualization and how Xen supports them.As we’ve seen, a hypervisor...

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Debug Linux shell scripts with ‘-x’

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If you ever need to debug a Unix or Linux shell script, you can just add the -x option to the interpreter when you invoke it. You can add the shell's debug option on the command line like this:sh -x misbehaving_script.shor at the end of the first line...

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Xen Virtualization and Cloud Computing #04: Containers, OpenStack, and Other Related Platforms

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Previous articles in this series introduced virtualization, discussed how Xen’s architecture provides it, and covered interesting Xen features. This article looks at some other platforms with which Xen interacts: containers and OpenStack.Virtualization, containers—or both?Containers are a mechanism for isolating processes, similar to virtualization. With Docker and Kubernetes, containers...

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Belonging: What Oracle LAD's D&I program is about

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“The launch of Diversity Committee, where everyone can work by their selves in the thematic pillars, and where they can propose ideas and make real actions, made the transformation more significant for all employees.” (Colombian employee, Internal Survey, 2019).Diversity and Inclusion is one of the hottest trends in...

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grep command in Unix/Linux

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The grep filter searches a file for a particular pattern of characters, and displays all lines that contain that pattern. The pattern that is searched in the file is referred to as the regular expression (grep stands for globally search for regular expression and print out). Syntax: grep...

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Linux shell script - while loop and sleep example

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Linux shell script FAQ: Can you share a Linux shell script while loop example? While you’re at it, can you show how to use the sleep command in the shell script while loop?Sure. As a little background, I’ve written a program I call an Email Agent that periodically...

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Xen Virtualization and Cloud Computing #03: Key Features of Xen

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The previous articles in this series introduced virtualization and showed how Xen is designed to provide it efficiently. Here we’ll delve into some interesting features and their importance. A larger list can be found at the appropriate project page on features. At time of writing this article, the...

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The Linux cancel command (cancel a print job)

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The Linux "cancel" command lets you stop print requests from printing (cancel them).Linux printing requests can be canceled by either (a) using the printer-id or (b) by specifying the printer name. Here are examples of each approach.cancel laser-101This first command cancels the print request identified as "laser-101". (You...

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Linux Professional Institute DevOps Tools Engineer

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Businesses across the globe are increasingly implementing DevOps practices to optimize daily systems administration and software development tasks. As a result, businesses across industries are hiring IT professionals that can effectively apply DevOps to reduce delivery time and improve quality in the development of new software products.To meet...

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Xen Virtualization and Cloud Computing #02: How Xen Does the Job

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This is the second article in a series. The first introduced virtualization and the Infrastructure as a Service (IaaS). This article explains how Xen uses different types of virtualization to achieve efficient isolation of virtual machines (VMs).Hardware and operating system supportXen runs as host on a number of...

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Open source careers: How Brittany Gates found her way to Linux

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At the end of 2019, Linux Professional Institute (LPI) celebrated 20 years of offering training and tests. The LPI20 Birthday Contest gave us the opportunity to hear from you some amazing stories about your careers in open source and how the LPI certification program helped you. Over the...

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Xen Virtualization and Cloud Computing #01: Introduction

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The Xen Project is a free and open source hypervisor that enables a computer to run multiple operating systems simultaneously on the same hardware. This article begins a series that covers the way Xen achieves this result efficiently, important features, and ways in which the Xen Project is...

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