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

Advanced Docker Compose concepts on ECS

We have managed to deploy our Compose application to a dedicated VPC and a dedicated ECS cluster. This gives us more control over our application and the resources we use. Building a cloud-native application comes with various benefits. We can have a rolling application update without any downtime, we can tune and scale an application based on its requirements, and we can manage and share secrets efficiently.

Updating the application

The docker compose up command is sufficient to update the application. Hence, the same command that is used to spin up the services will be used to update them.

Since Compose is backed by CloudFormation, the update will take place, but it can also cause downtime if a certain component of the infrastructure is removed and recreated. Rolling updates need to be configured. By using a rolling update, the container instances of a service are updated incrementally. This ensures that the application can still service...