Book Image

Cloud Native Applications with Ballerina

By : Dhanushka Madushan
Book Image

Cloud Native Applications with Ballerina

By: Dhanushka Madushan

Overview of this book

The Ballerina programming language was created by WSO2 for the modern needs of developers where cloud native development techniques have become ubiquitous. Ballerina simplifies how programmers develop and deploy cloud native distributed apps and microservices. Cloud Native Applications with Ballerina will guide you through Ballerina essentials, including variables, types, functions, flow control, security, and more. You'll explore networking as an in-built feature in Ballerina, which makes it a first-class language for distributed computing. With this app development book, you'll learn about different networking protocols as well as different architectural patterns that you can use to implement services on the cloud. As you advance, you'll explore multiple design patterns used in microservice architecture and use serverless in Amazon Web Services (AWS) and Microsoft Azure platforms. You will also get to grips with Docker, Kubernetes, and serverless platforms to simplify maintenance and the deployment process. Later, you'll focus on the Ballerina testing framework along with deployment tools and monitoring tools to build fully automated observable cloud applications. By the end of this book, you will have learned how to apply the Ballerina language for building scalable, resilient, secured, and easy-to-maintain cloud native Ballerina projects and applications.
Table of Contents (15 chapters)
1
Section 1: The Basics
4
Section 2: Building Microservices with Ballerina
8
Section 3: Moving on with Cloud Native

Communication between services in a microservice architecture

In the previous chapter, we discussed the development of simple services with the Ballerina language. We addressed the use of the HTTP server to manage HTTP requests. But, when it comes to production systems, we need to consider several factors in dealing with communication between services, such as how each service finds other services, how to manage failures, and so on. In this section, we will discuss how to solve these problems and build a reliable platform with microservice architecture.

Communication over services in the Kubernetes cluster

When two services need to communicate with each other, the client should know the address of the server to be connected with it. In the HTTP, we use a URL to represent this unique address. The URL consists of the hostname and the port number to connect to.

The hostname is a human-readable text that can be used to uniquely identify a node in a network. It acts as a label...