Tags: SysAdmin

Linux tcpdump Command Tutorial for Beginners (8 Examples)

Every time you open a webpage on your computer, data packets are sent and received on your network interface. Sometimes, analyzing these packets becomes important for many reasons. Thankfully, Linux offers a command line utility that dumps information related to these data packets in output. In...
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Linux links
We continue our series on using Linux links with a look at some quirks you should know about.

Understanding Linux Links: Part 2

In the first part of this series, we looked at hard links and soft links and discussed some of the various ways that linking can be useful. Linking may seem straightforward, but there are some non-obvious quirks you have to be aware of. That’s what we’ll be looking at here. Consider, for example,...
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Linux: Find Out Which Port Number a Process is Listening on

As Linux users, we sometimes need to know which port number a particular process is listening upon. All ports are associated with a process ID or service in an OS. So how do we find that port? This article presents three different methods for you to find which port number a process is listening on...
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LiFT
This year’s LiFT recipients represent the potential for greatness in future participation in the open source community. Learn more.

The Linux Foundation Awards 31 Open Source Training Scholarships

The Linux Foundation training (LiFT) program provides advanced open source training to existing and aspiring IT professionals from around the world who might not have the means for specialized training. Since 2011, the Linux Foundation has awarded 106 training scholarships worth over $220...
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training
Learn more about Introduction to Open Source Development, Git, and Linux training course and sign up now to start your open source journey.

Learn to Work with Bash, Linux, and Git

As technology infrastructure shifts ever more in the direction of open source, there is rapidly growing need for open source skills. Use of open source software leads to better and faster development, and wider collaboration, and open source skills are a very valuable form of currency in the job...
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Testing Kubernetes RBAC

Securing your Kubernetes cluster is one thing, keeping it secure is a continuous uphill struggle. However, with the introduction of new features to Kubernetes it is becoming much easier to do both. Kubernetes (as of version 1.6) has introduced the concept of Role-Based Access Control (RBAC), allows...
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Linux Links
Links provide another way of putting files and directories where you want them; learn more in this tutorial for beginners.

Understanding Linux Links: Part 1

Along with cp and mv, both of which we talked about at length in the previous installment of this series, links are another way of putting files and directories where you want them to be. The advantage is that links let you have one file or directory show up in several places at the same time. As...
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A Look at Fundamental Linux sed Commands

Linux administrators who want to modify files without overwriting the original have many options, but one of the most efficient tools is the stream editor -- or sed. The stream editor is a default part of most Linux distributions. It enables you to perform text file manipulations in the operating...
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Kenzan kr8sswordz
In the final part of this series, we will set up CI/CD hooks for the Kr8sswordz Puzzle app.

Set Up CI/CD for a Distributed Crossword Puzzle App on Kubernetes (Part 4)

Part 3 had us running our Kr8sswordz Puzzle app, spinning up multiple instances for a load test, and watching Kubernetes gracefully balance numerous requests across the cluster. Though we set up Jenkins for use with our Hello-Kenzan app in Part 2, we have yet to set up CI/CD hooks for the...
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4-Phase Approach for Taking Over Large, Messy IT Systems

Everyone loves building shiny, new systems using the latest technologies and especially the most modern DevOps tools. But that's not the reality for lots of operations teams, especially those running larger systems with millions of users and old, complex infrastructure. It's even worse for teams...
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