Book Image

Hands-On Linux Administration on Azure

By : Frederik Vos
Book Image

Hands-On Linux Administration on Azure

By: Frederik Vos

Overview of this book

Azure’s market share has increased massively and enterprises are adopting it rapidly, while Linux is a widely-used operating system and has proven to be one of the most popular workloads on Azure. It has thus become crucial for Linux administrators and Microsoft professionals to be well versed with managing Linux workloads in an Azure environment. With this guide, system administrators will be able to deploy, automate, and orchestrate containers in Linux on Azure. The book follows a hands-on approach to help you understand DevOps, monitor Linux workloads on Azure and perform advanced system administration. Complete with systematic explanations of concepts, examples and self-assessment questions, the chapters will give you useful insights into Linux and Azure. You’ll explore some of Linux’s advanced features for managing multiple workloads and learn to deploy virtual machines (VMs) in Azure. Dedicated sections will also guide you with managing and extending Azure VMs’ capabilities and understanding automation and orchestration with Ansible and PowerShell DSC. In later chapters, you’ll cover useful Linux troubleshooting and monitoring techniques that will enable you to maintain your workload on Azure. By the end of this book, you’ll be able to make the most out of Azure’s services to efficiently deploy and manage your Linux workloads.
Table of Contents (14 chapters)

Logging in Linux

In earlier chapters, we already encountered the journalctl command. In this chapter, I'll discuss this command in much more detail.

In Linux distributions, such as the latest versions of RHEL/CentOS, Debian, Ubuntu and SUSE, that uses systemd as their init system, the systemd-journald daemon is used for logging. This daemon collects the standard output of a unit, syslog message, and, if the application support it: direct messages from the application to systemd.

The logs are collected in a database that can be queried with journalctl.

Working with journalctl

If you execute systemctl status <unit>, you already see the last entries of the logging. To see the full log, journalctl is the tool that you...