News Category: System Administration

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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DNS Security Still an Issue

DNS security is a decades-old issue that shows no signs of being fully resolved. Here's a quick overview of some of the problems with proposed solutions and the best way to move forward. ...After many years of availability, DNSSEC has yet to attain significant adoption, even though any security...
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log files
Jack looks at a few tools to help you mine the depths of your log files.

Open Source Logging Tools for Linux

If you’re a Linux systems administrator, one of the first tools you will turn to for troubleshooting are log files. These files hold crucial information that can go a long way to help you solve problems affecting your desktops and servers. For many sysadmins (especially those of an old-school sort...
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14 Common Network Ports You Should Know

The physical ports on your computer allow communicate with peripheral devices such as your keyboard and mouse and to connect with internet devices via Ethernet cables. Within computer networking, ports serve a similar purpose. When a computer system seeks to connect to another computer, the port...
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How to Install OpenLDAP on Ubuntu 18.04

LDAP is the Lightweight Directory Access Protocol, which allows for the querying and modification of an X.500-based directory service. LDAP is used over an IP network to manage and access a distributed directory service. The primary purpose of LDAP is to provide a set of records in a hierarchical...
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An Introduction to Swap Space on Linux Systems

Swap space is a common aspect of computing today, regardless of operating system. Linux uses swap space to increase the amount of virtual memory available to a host. It can use one or more dedicated swap partitions or a swap file on a regular filesystem or logical volume. There are two basic types...
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Site Reliability Engineering (SRE): A Simple Overview

Curious about site reliability engineering (SRE)? The following overview is for you. It covers some of the basics of SRE: what it is, how it’s used, and what you need to keep in mind before adopting SRE methods. In the book Site Reliability Engineering, contributor Benjamin Treynor Sloss—the...
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Tracking and Controlling Microservice Dependencies

Dependency cycles will be familiar to you if you have ever locked your keys inside your house or car. You can't open the lock without the key, but you can't get the key without opening the lock. Some cycles are obvious, but more complex dependency cycles can be challenging to find before they lead...
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How to List Repositories on Linux

A Linux repository is a storage location from which your system retrieves and installs OS updates and applications. Each repository is a collection of software hosted on a remote server and intended to be used for installing and updating software packages on Linux systems. When you run commands...
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