Book Image

A Developer's Guide to Cloud Apps Using Microsoft Azure

By : Hamida Rebai Trabelsi
Book Image

A Developer's Guide to Cloud Apps Using Microsoft Azure

By: Hamida Rebai Trabelsi

Overview of this book

Companies face several challenges during cloud adoption, with developers and architects needing to migrate legacy applications and build cloud-oriented applications using Azure-based technologies in different environments. A Developer’s Guide to Cloud Apps Using Microsoft Azure helps you learn how to migrate old apps to Azure using the Cloud Adoption Framework and presents use cases, as well as build market-ready secure and reliable applications. The book begins by introducing you to the benefits of moving legacy apps to the cloud and modernizing existing ones using a set of new technologies and approaches. You’ll then learn how to use technologies and patterns to build cloud-oriented applications. This app development book takes you on a journey through three major services in Azure, namely Azure Container Registry, Azure Container Instances, and Azure Kubernetes Service, which will help you build and deploy an application based on microservices. Finally, you’ll be able to implement continuous integration and deployment in Azure to fully automate the software delivery process, including the build and release processes. By the end of this book, you’ll be able to perform application migration assessment and planning, select the right Azure services, and create and implement a new cloud-oriented application using Azure containers and orchestrators.
Table of Contents (20 chapters)
1
Part 1 – Migrating Applications to Azure
6
Part 2 – Building Cloud-Oriented Applications Using Patterns and Technologies in Azure
10
Part 3 – PaaS versus CaaS to Deploy Containers in Azure
14
Part 4 – Ensuring Continuous Integration and Continuous Deployment on Azure
17
Assessments

Exercise 3 – deploying an AKS cluster and running an application using the Azure CLI

In the previous section, we created an AKS cluster where we will deploy our application.

Deployments play a critical role in the Kubernetes environment because they are the mechanism for creating Pods that run the containers hosting our code.

If we go back to the Kubernetes architecture, we have our master nodes, a database storing all the information, the controllers, which allow us to interact with the nodes, and the API that we interact with using kubectl. With Deployments, we can send our standard kubectl commands to the API and the controllers will arrange what happens on the nodes. We can create one or more Pods per node. Knowing that a node is a virtual machine, the goal of the Deployments is to deploy the Pods that will run in our containers. A Deployment relies on a ReplicaSet. A ReplicaSet is where we set the number of Pods. For example, if we give the ReplicaSet a value of 3...