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

Shelling into a container managed by Compose

Since we’ve been successful in running a Redis database using Compose, we will run some commands upon that Redis instance and get familiar with the database. As happens with many container-based distributions of databases, along with the actual database, the image can contain tools that help the user interact with the database for administrative or usage purposes.

The Redis CLI can be used to send commands to a Redis service. The Redis Docker image does contain the Redis CLI, so we should be able to use it with the running database.

Let’s find our running Redis image:

$ docker ps --format "{{.Names}}"
chapter2-redis-1
$

Let’s shell into this image:

$ docker exec -it chapter2-redis-1 bash
root@d189b089bcf6:/data#

We just shelled successfully into a container managed by Compose. Let’s navigate and see what is already there:

$ root@d189b089bcf6:/data# ls
dump.rdb
root@d189b089bcf6...