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

Adding an endpoint for Prometheus

Let’s see how to add an endpoint to our existing Compose endpoints. The code base that will be used in this chapter will be the code base that we created in Chapter 5, Connecting Microservices. We should update the code base and add the endpoints that will enable Prometheus to scrap metrics from our applications.

Adding the metrics endpoint to the Task Manager

Adding Prometheus to an HTTP-based Go application is streamlined. By following the instructions online (https://prometheus.io/docs/guides/go-application), we can find the following go get commands that will download the necessary libraries to use with our Go application:

$ go get github.com/prometheus/client_golang/prometheus 
$ go get github.com/prometheus/client_golang/prometheus/promauto 
$ go get github.com/prometheus/client_golang/prometheus/promhttp

The default way to add a Prometheus endpoint is by using the Go http server:

func main() {
    ...