Book Image

Linux for System Administrators

By : Viorel Rudareanu, Daniil Baturin
Book Image

Linux for System Administrators

By: Viorel Rudareanu, Daniil Baturin

Overview of this book

Linux system administration is an essential aspect of maintaining and managing Linux servers within an organization. The role of a Linux system administrator is pivotal in ensuring the smooth functioning and security of these servers, making it a critical job function for any company that relies on Linux infrastructure. This book is a comprehensive guide designed to help you build a solid foundation in Linux system administration. It takes you from the fundamentals of Linux to more advanced topics, encompassing key areas such as Linux system installation, managing user accounts and filesystems, networking fundamentals, and Linux security techniques. Additionally, the book delves into the automation of applications and infrastructure using Chef, enabling you to streamline and optimize your operations. For both newcomers getting started with Linux and professionals looking to enhance their skills, this book is an invaluable hands-on guide with a structured approach and concise explanations that make it an effective resource for quickly acquiring and reinforcing Linux system administration skills. With the help of this Linux book, you’ll be able to navigate the world of Linux administration confidently to meet the demands of your role.
Table of Contents (21 chapters)
Part 1: Linux Basics
Part 2: Configuring and Modifying Linux Systems
Part 3: Linux as a Part of a Larger System


Journal is part of systemd. Messages from various parts of a systemd-enabled Linux machine are collected here. This comprises notifications from the kernel and boot process, syslog, and other services.

Traditionally, during Linux’s boot process, the OS’s many subsystems and application daemons would each log messages in text files. Different levels of detail would be logged for each subsystem’s messages. When troubleshooting, administrators often had to sift through messages from several files spanning different periods and then correlate the contents. The journaling feature eliminates this problem by centrally logging all system and application-level messages.

The systemd-journald daemon is in charge of the journal. It gathers data from several resources and inserts the gathered messages into the diary.

When systemd is using in-memory journaling, the journal files are generated under the /run/log/journal folder. If there isn’t already...