Krakend Docker Compose

Krakend is an API Gateway that simplifies the process of routing, composition, and integration of microservices. Docker Compose is a tool for defining and running multi-container Docker applications. In this article, we will explore how to use Krakend with Docker Compose to simplify the deployment of microservices.

Prerequisites

Before getting started, make sure that you have Docker and Docker Compose installed on your machine. You can download Docker from the official website: https://www.docker.com/get-started.

Creating a Krakend Docker Compose File

Create a new file called docker-compose.yml and paste the following code:

version: "3.8"
services:
  krakend:
    image: devopsfaith/krakend
    ports:
      - "8080:8080"
    environment:
      - KRAKEND_CONFIG=/etc/krakend/krakend.json
    volumes:
      - ./krakend.json:/etc/krakend/krakend.json:ro
    depends_on:
      - service1
      - service2
  service1:
    image: service1:latest
  service2:
    image: service2:latest

This file will define three services: a Krakend service that will act as the API Gateway, and two microservices (service1 and service2) that will be proxied by Krakend.

Configuring Krakend

Create a new file called krakend.json that contains your Krakend configuration. Make sure that you set the endpoint of each endpoint to the corresponding microservice's hostname. For example:

{
  "version": 2,
  "endpoints": [
    {
      "endpoint": "/service1",
      "backend": [
        {
          "host": "service1",
          "url_pattern": "/service1"
        }
      ]
    },
    {
      "endpoint": "/service2",
      "backend": [
        {
          "host": "service2",
          "url_pattern": "/service2"
        }
      ]
    }
  ]
}

This file defines two endpoints, /service1 and /service2, that will be proxied to the service1 and service2 services respectively.

Running the Services

To start the services, navigate to the directory containing the docker-compose.yml file and run the following command:

$ docker-compose up

This will start the Krakend, Service1, and Service2 services. You will be able to access the API Gateway at http://localhost:8080.

Conclusion

In this article, we have seen how to use Krakend with Docker Compose to simplify the deployment of microservices. We created a Docker Compose file that defined the Krakend, Service1, and Service2 services and configured Krakend to proxy requests to the microservices. By running the docker-compose up command, we were able to start all the services simultaneously.