Tags: System Administration

An Introduction to Udev: The Linux Subsystem for Managing Device Events

Udev is the Linux subsystem that supplies your computer with device events. In plain English, that means it's the code that detects when you have things plugged into your computer, like a network card, external hard drives (including USB thumb drives), mouses, keyboards, joysticks and gamepads, DVD...
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Systems Engineer Salary Rises Even Higher with Linux Experience

System administration is a very reactive role, with sysadmins constantly monitoring networks for issues. Systems engineers, on the other hand, can build a system that anticipates users’ needs (and potential problems). In certain cases, they must integrate existing technology stacks (e.g., following...
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LDAP Authentication In Linux

This howto will show you how to store your users in LDAP and authenticate some of the services against it. I will not show how to install particular packages, as it is distribution/system dependent. I will focus on "pure" configuration of all components needed to have LDAP authentication/storage of...
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How to Manage Storage on Linux with LVM

Logical Volume Manager (LVM) is a software-based RAID-like system that lets you create "pools" of storage and add hard drive space to those pools as needed. There are lots of reasons to use it, especially in a data center or any place where storage requirements change over time. Many Linux...
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What Operations Professionals Need to Know to Fuel Career Advancement

O’Reilly conducted a recent survey[1] of operations professionals, and the results offer useful information and insights to empower your career planning.  Scripting languages are the most popular programming languages among respondents, with Bash being the most used (66% of respondents), followed...
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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
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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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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The Illustrated TLS Connection

Every byte of a TLS connection explained and reproduced. In this demonstration, a client has connection to a server, negotiated a TLS 1.2 session, sent "ping", received "pong", and then terminated the session. Click below to begin exploring. Client Hello   The session begins with the client...
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Keeping the Software in Docker Containers Up to Date

Docker has radically changed the way admins roll out their software in many companies. However, regular updates are still needed. How does this work most effectively with containers? From an admin's point of view, Docker containers have much to recommend them: They can be operated with reduced...
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