d. Containerization

2. Docker Compose

Previously work on the Account microservice, it is necessary to prepare the environment by installing the database to persist the data. For that, we will use a Docker Compose file to create a PostgreSQL container, as well as, a cluster to isolate the microservices from external access, creating a secure environment - trusted layer. A Docker Compose file is a YAML file that defines how Docker containers should behave in production. The file contains the configuration for the database, the microservices, and the network configuration.

flowchart LR
    subgraph api [Trusted Layer]
        direction TB
        account e3@==> db@{ shape: cyl, label: "Database" }
    end
    internet e1@==>|request| account:::red
    e1@{ animate: true }
    e3@{ animate: true }
    classDef red fill:#fcc

📁 api/
├── 📁 account/
├── 📁 account-service/
│   ├── 📁 src/
│   └──  Dockerfile
├──  .env
└──  compose.yaml

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FROM eclipse-temurin:25-jdk
VOLUME /tmp
COPY target/*.jar app.jar
ENTRYPOINT ["java","-jar","/app.jar"]