Book Image

Building Microservices with Go

By : Nic Jackson
Book Image

Building Microservices with Go

By: Nic Jackson

Overview of this book

Microservice architecture is sweeping the world as the de facto pattern to build web-based applications. Golang is a language particularly well suited to building them. Its strong community, encouragement of idiomatic style, and statically-linked binary artifacts make integrating it with other technologies and managing microservices at scale consistent and intuitive. This book will teach you the common patterns and practices, showing you how to apply these using the Go programming language. It will teach you the fundamental concepts of architectural design and RESTful communication, and show you patterns that provide manageable code that is supportable in development and at scale in production. We will provide you with examples on how to put these concepts and patterns into practice with Go. Whether you are planning a new application or working in an existing monolith, this book will explain and illustrate with practical examples how teams of all sizes can start solving problems with microservices. It will help you understand Docker and Docker-Compose and how it can be used to isolate microservice dependencies and build environments. We finish off by showing you various techniques to monitor, test, and secure your microservices. By the end, you will know the benefits of system resilience of a microservice and the advantages of Go stack.
Table of Contents (18 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Index

Docker ports


When running web applications inside a container, it is quite common that we will need to expose some ports to the outside world. By default, a Docker container is completely isolated, and if you start a server running on port 8080 inside your container unless you explicitly specify that port is accessible from the outside, it will not be accessible.

Mapping ports is a good thing from a security perspective as we are operating on a principle of no trust. It is also effortless to expose these ports. Using one of the examples we created in Chapter 1, Introduction to Microservices, let's see just how easy this is.

Move to the folder where you checked out the sample code, and run the following Docker command:

$ docker run -it --rm -v $(pwd):/src -p 8080:8080 -w /src golang:alpine /bin/sh

The -w flag we are passing is to set the working directory that means that any command we run in the container will be run inside this folder. When we start the shell, you will see that rather than...