Book Image

Mastering Linux Administration

By : Alexandru Calcatinge, Julian Balog
Book Image

Mastering Linux Administration

By: Alexandru Calcatinge, Julian Balog

Overview of this book

Linux plays a significant role in modern data center management and provides great versatility in deploying and managing your workloads on-premises and in the cloud. This book covers the important topics you need to know about for your everyday Linux administration tasks. The book starts by helping you understand the Linux command line and how to work with files, packages, and filesystems. You'll then begin administering network services and hardening security, and learn about cloud computing, containers, and orchestration. Once you've learned how to work with the command line, you'll explore the essential Linux commands for managing users, processes, and daemons and discover how to secure your Linux environment using application security frameworks and firewall managers. As you advance through the chapters, you'll work with containers, hypervisors, virtual machines, Ansible, and Kubernetes. You'll also learn how to deploy Linux to the cloud using AWS and Azure. By the end of this Linux book, you'll be well-versed with Linux and have mastered everyday administrative tasks using workflows spanning from on-premises to the cloud. If you also find yourself adopting DevOps practices in the process, we'll consider our mission accomplished.
Table of Contents (20 chapters)
Section 1: Linux Basic Administration
Section 2: Advanced Linux Server Administration
Section 3: Cloud Administration

Working with Kubernetes

In this section, we'll use real-world examples of interacting with a Kubernetes cluster. Since we'll be using the kubectl CLI to a considerable extent, we're going to deep dive into some of its more common usage patterns. Then, we turn our focus to deploying applications to a Kubernetes cluster. We'll be using the on-premises environment we built in the Installing Kubernetes on virtual machines section.

Let's start by taking a closer look at kubectl and its usage.

Using kubectl

kubectl is the primary tool for managing a Kubernetes cluster and its resources. kubectl communicates with the cluster's API server endpoint using the Kubernetes REST API. The general syntax of the kubectl command is as follows:

kubectl [command] [TYPE] [NAME] [flags]

In general, kubectl commands execute CRUD operationsCreate, Read, Update, and Delete – against Kubernetes resources, such as Pods, deployments, and Services.