Book Image

Mastering Ubuntu Server. - Second Edition

By : Jay LaCroix
Book Image

Mastering Ubuntu Server. - Second Edition

By: Jay LaCroix

Overview of this book

Ubuntu Server has taken the data centers by storm. Whether you're deploying Ubuntu for a large-scale project or for a small office, it is a stable, customizable, and powerful Linux distribution that leads the way with innovative and cutting-edge features. For both simple and complex server deployments, Ubuntu's flexible nature can be easily adapted to meet to the needs of your organization. With this book as your guide, you will learn all about Ubuntu Server, from initial deployment to creating production-ready resources for your network. The book begins with the concept of user management, group management, and filesystem permissions. Continuing into managing storage volumes, you will learn how to format storage devices, utilize logical volume management, and monitor disk usage. Later, you will learn how to virtualize hosts and applications, which will cover setting up KVM/QEMU, as well as containerization with both Docker and LXD. As the book continues, you will learn how to automate configuration with Ansible, as well as take a look at writing scripts. Lastly, you will explore best practices and troubleshooting techniques when working with Ubuntu Server that are applicable to real-world scenarios. By the end of the book, you will be an expert Ubuntu Server administrator who is well-versed in its advanced concepts.
Table of Contents (21 chapters)

Monitoring memory usage

Understanding how Linux manages memory can actually be a somewhat complex topic, as understanding how much memory is truly free can be a small hurdle for newcomers to overcome. You'll soon see that how Linux manages memory on your server is actually fairly straightforward. For the purpose of monitoring memory usage on our server, we have the free command at our disposal, which we can use to see how much memory is being consumed at any given time. My favorite variation of this command is free -m, which shows the amount of memory in use in terms of megabytes. You can also use free -g to show the output in terms of gigabytes, but the output won't be precise enough on most servers. Giving the free command no option will result in the output being shown in terms of kilobytes:

Output of the free command

In my opinion, adding the -m option makes the...