Book Image

Ansible for Real-Life Automation

By : Gineesh Madapparambath
Book Image

Ansible for Real-Life Automation

By: Gineesh Madapparambath

Overview of this book

Get ready to leverage the power of Ansible’s wide applicability to automate and manage IT infrastructure with Ansible for Real-Life Automation. This book will guide you in setting up and managing the free and open source automation tool and remote-managed nodes in the production and dev/staging environments. Starting with its installation and deployment, you’ll learn automation using simple use cases in your workplace. You’ll go beyond just Linux machines to use Ansible to automate Microsoft Windows machines, network devices, and private and public cloud platforms such as VMWare, AWS, and GCP. As you progress through the chapters, you’ll integrate Ansible into your DevOps workflow and deal with application container management and container platforms such as Kubernetes. This Ansible book also contains a detailed introduction to Red Hat Ansible Automation Platform to help you get up to speed with Red Hat AAP and integration with CI/CD and ITSM. What’s more, you’ll implement efficient automation solutions while learning best practices and methods to secure sensitive data using Ansible Vault and alternatives to automate non-supported platforms and operations using raw commands, command modules, and REST API calls. By the end of this book, you’ll be proficient in identifying and developing real-life automation use cases using Ansible.
Table of Contents (22 chapters)
1
Part 1: Using Ansible as Your Automation Tool
6
Part 2: Finding Use Cases and Integrations
16
Part 3: Managing Your Automation Development Flow with Best Practices

Scaling Kubernetes applications

The ReplicaSet resource in Kubernetes ensures that a specified number of application Pod replicas are running as part of the Deployment. This mechanism will help to scale the application horizontally whenever needed and without additional resource configurations. A ReplicaSet resource will be created when you create a deployment resource in Kubernetes, as shown in Figure 11.28:

Figure 11.28 – A ReplicaSet resource created as part of Deployment

Specify the initial number of replicas inside the Deployment definition file as replicas: 1 . ReplicaSet will scale the number of Pods based on the replica number.

When there is extra traffic on the application Pods, scale the application using the kubectl scale command, as follows (modify the Deployment, not the ReplicaSet):

Figure 11.29 – Scaling an application using kubectl

Wait for the replication changes to take effect and check the resource...