Book Image

A Developer's Essential Guide to Docker Compose

By : Emmanouil Gkatziouras
Book Image

A Developer's Essential Guide to Docker Compose

By: Emmanouil Gkatziouras

Overview of this book

Software development is becoming increasingly complex due to the various software components used. Applications need to be packaged with software components to facilitate their operations, making it complicated to run them. With Docker Compose, a single command can set up your application and the needed dependencies. This book starts with an overview of Docker Compose and its usage and then shows how to create an application. You will also get to grips with the fundamentals of Docker volumes and network, along with Compose commands, their purpose, and use cases. Next, you will set up databases for daily usage using Compose and, leveraging Docker networking, you will establish communication between microservices. You will also run entire stacks locally on Compose, simulate production environments, and enhance CI/CD jobs using Docker Compose. Later chapters will show you how to benefit from Docker Compose for production deployments, provision infrastructure on public clouds such as AWS and Azure, and wrap up with Compose deployments on said infrastructure. By the end of this book, you will have learned how to effectively utilize Docker Compose for day-to-day development.
Table of Contents (19 chapters)
1
Part 1: Docker Compose 101
6
Part 2: Daily Development with Docker Compose
12
Part 3: Deployment with Docker Compose

Introducing the location microservice

By using the Task Manager application, introduced in Chapter 2, Running the First Application Using Compose, we will enhance its functionality by adding a location where a task should take place. Each task will have a location. By gathering those tasks, the locations will be stored; thus, each time a task is created, locations that have been previously visited will be recommended.

We shall create the location service as a new microservice. The service will not share anything with the Task Manager. It will have an API of its own. For simplicity, we shall use the same programming language we used previously, Golang, as well as the same database, Redis.

Let’s proceed with a Redis instance. Since will we use Compose, the following will be our configuration:

services:  
  redis:  
    image: redis

We can run in detached mode:

$ docker compose -f redis.yaml up -d 

We shall create...