![]() You can use any Spring Boot application and provide its Dockerfile. The network names should be same as the networks we created in previous step.įor this we step need a sample Spring Boot application. Specified that this service is available on both internal and external networks.The host can now connect directly to Mysql database port 3306. Exposed Port 3306 to the host machine.Provided the startup parameters via environment variables.Provided the image tag, to specify that the Mysql container should be created from this docker image.Specified the service name as “ database“.Networks: # Specify the networks for this service Ideally only Traefik load balancer and the Mysql database will be on this network.Īdd following lines to docker-compose.yml, to create both internal and external networks networks:ĭifferent components of the application like database, application server, load balancer, etc are known as services in docker compose, and we will first create the database service.Īdd following code to the docker-compose.yml services:Įnvironment: # Specify environment variables.Only those containers that need to be accessed directly from outside will be put on this network.All containers will be on the internal network.We will create two types of network for our application This is to ensure that they can communicate with each other. Lets start by creating an empty file – docker-compose.yml, and place it at the root folder of your Spring Boot application.Īdd just one line to it – to denote the version of Docker Compose we will be using version: '3.8'Īll the containers need to be on the same docker network. We will write a docker compose to start above application, and also see how we can scale it. This YAML file is the source of truth of how we want to run our application, and can be used to deploy and run our entire application on any machine using simple commands. It basically allows you to create a YAML file, in which we describe how we want to compose our application. This is where Docker Compose comes to the rescue. The problem becomes even bigger when we have to re-create the same application on other environments. Scaling up or down also requires us to manually start or stop each containers.Creating networks and running all containers in same docker network. ![]() ![]() Running such an multi-container application requires lot of manual effort But it only helped in running a single docker container only.Īny web application is generally composed of many components – application servers / database servers / load balancer, etc, all of which may be running in their own docker containers. In our last post, we saw how to create a Dockerfile for your Spring Boot application and run the application using Docker container. We will use Docker compose to start an application comprising of Spring Boot application / MySQL database and Traefik load balancer. In this article we will look at how to use Docker compose to run multi-container applications. ![]()
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