Implantação com Docker

O Docker permite conteinerizar e implantar microsserviços com facilidade. Vamos ver como criar imagens Docker e orquestrar a implantação dos nossos serviços.

1. Configuração Básica

1.1 Dockerfile

# Stage de build
FROM eclipse-temurin:17-jdk-alpine AS build
WORKDIR /workspace/app
COPY mvnw .
COPY .mvn .mvn
COPY pom.xml .
COPY src src
RUN ./mvnw install -DskipTests
RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)

# Stage de runtime
FROM eclipse-temurin:17-jre-alpine
VOLUME /tmp
ARG DEPENDENCY=/workspace/app/target/dependency
COPY --from=build ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY --from=build ${DEPENDENCY}/META-INF /app/META-INF
COPY --from=build ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","com.example.product.ProductServiceApplication"]

1.2 Configuração do Docker Compose

# docker-compose.yml
version: '3.8'

services:
  eureka-server:
    build: ./eureka-server
    ports:
      - "8761:8761"
    environment:
      - SPRING_PROFILES_ACTIVE=prod
    networks:
      - microservices-network

  config-server:
    build: ./config-server
    ports:
      - "8888:8888"
    environment:
      - SPRING_PROFILES_ACTIVE=prod
      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://eureka-server:8761/eureka/
    depends_on:
      - eureka-server
    networks:
      - microservices-network

  api-gateway:
    build: ./api-gateway
    ports:
      - "8080:8080"
    environment:
      - SPRING_PROFILES_ACTIVE=prod
      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://eureka-server:8761/eureka/
      - SPRING_CLOUD_CONFIG_URI=http://config-server:8888
    depends_on:
      - eureka-server
      - config-server
    networks:
      - microservices-network

  product-service:
    build: ./product-service
    ports:
      - "8081:8081"
    environment:
      - SPRING_PROFILES_ACTIVE=prod
      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://eureka-server:8761/eureka/
      - SPRING_CLOUD_CONFIG_URI=http://config-server:8888
    depends_on:
      - eureka-server
      - config-server
    networks:
      - microservices-network

  order-service:
    build: ./order-service
    ports:
      - "8082:8082"
    environment:
      - SPRING_PROFILES_ACTIVE=prod
      - EUREKA_CLIENT_SERVICEURL_DEFAULTZONE=http://eureka-server:8761/eureka/
      - SPRING_CLOUD_CONFIG_URI=http://config-server:8888
    depends_on:
      - eureka-server
      - config-server
    networks:
      - microservices-network

  zipkin:
    image: openzipkin/zipkin
    ports:
      - "9411:9411"
    networks:
      - microservices-network

networks:
  microservices-network:
    driver: bridge