Dockerize the application in a Compose tool
DockerFiles and Docker commands work well for building single containers. Container management slows down if we wish to operate on an application’s shared network.
Docker offers a tool called Docker Compose to solve this problem. This utility has a unique build file format in YAML. Multiple services’ configurations can be combined into a single file called docker-compose.yml.
The Docker Compose File
Here is the example Docker Compose file is a basic configuration for orchestrating multiple services. It defines two services, “service1” and “service2”, each with specified Docker images, container names, exposed ports, and environment variables. The version we can modify the as per our requirements.
version: '3.8'
services:
service1:
image: your_image_name
container_name: your_container_name
ports:
- "host_port:container_port"
environment:
- ENV_VARIABLE=value
service2:
image: your_image_name
container_name: your_container_name
ports:
- "host_port:container_port"
environment:
- ENV_VARIABLE=value
Below is the command to build docker-compose file:
$ docker-compose config
For building an image and creating docker container we can use the below command:
$ docker-compose up --build
To stop the container, we should remove them from Docker. For this we can use the below command:
$ docker-compose down
Scaling Services
Scaling services in Docker Compose refers to the ability to increase or decrease the number of instances of a service defined in a Docker Compose file. This can be achieved by adjusting the “scale” property of a service to specify the desired number of containers to run for that service.
$ docker-compose --file docker-compose.yml up -d --build --scale service=1 --scale product-server=1
A single service one and a single product server will be spin up by this operation.
How To Dockerize A Spring Boot Application With Maven ?
Docker is an open-source containerization tool used for building, running, and managing applications in an isolated environment. A container is isolated from another and bundles its software, libraries, and configuration files. In this article, to dockerize a Spring Boot application for deployment purposes, we will learn how to create a spring boot app, and how to create a docker image for the spring boot app and we will run it on the docker container.
Prerequisites: Before continuing any further, please ensure that node and docker are installed on your machine. If required, visit the Java Installation Guide or the Docker Installation Guide.
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