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feat: add Dockerfile and .dockerignore for containerized builds #6

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feat: add Dockerfile and .dockerignore for containerized builds #6

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10 changes: 10 additions & 0 deletions .dockerignore
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Original file line number Diff line number Diff line change
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.git
.github
target/
*.md
.gitignore
.idea/
*.iml
.vscode/
.DS_Store
docker-compose*.yml
37 changes: 37 additions & 0 deletions Dockerfile
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# Stage 1 - Build
FROM eclipse-temurin:21-jdk-alpine AS build

WORKDIR /app

COPY mvnw .
COPY .mvn .mvn
COPY pom.xml .

RUN chmod +x mvnw && ./mvnw dependency:go-offline -B

COPY src src

RUN ./mvnw clean package -DskipTests -B

# Stage 2 - Runtime
FROM eclipse-temurin:21-jre-alpine AS runtime

LABEL maintainer="felipementel" \
description="CRUD de usuarios em Spring Boot com Ports and Adapters"

RUN addgroup -S appgroup && adduser -S appuser -G appgroup

WORKDIR /app

COPY --from=build /app/target/usuarios-api-java-0.1.0.jar app.jar
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Copilot AI Mar 28, 2026

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The runtime stage copies a version-pinned JAR name (usuarios-api-java-0.1.0.jar). This will break the Docker build whenever the project version changes or if the artifact name is customized. Consider producing a stable output name during the build (e.g., configure Maven finalName to app) and copy that, or otherwise avoid hard-coding the version in the Dockerfile.

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COPY --from=build /app/target/usuarios-api-java-0.1.0.jar app.jar
COPY --from=build /app/target/*.jar app.jar

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RUN chown appuser:appgroup app.jar

Comment on lines +26 to +29
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Copilot AI Mar 28, 2026

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You can avoid the extra layer from RUN chown ... by using COPY --chown=appuser:appgroup --from=build ... app.jar when copying the JAR into the runtime image. This keeps the image slightly smaller and the Dockerfile simpler.

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COPY --from=build /app/target/usuarios-api-java-0.1.0.jar app.jar
RUN chown appuser:appgroup app.jar
COPY --chown=appuser:appgroup --from=build /app/target/usuarios-api-java-0.1.0.jar app.jar

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USER appuser

EXPOSE 8080

HEALTHCHECK --interval=30s --timeout=5s --start-period=30s --retries=3 \
CMD wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health || exit 1
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Copilot AI Mar 28, 2026

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The HEALTHCHECK targets /actuator/health, but this repo currently doesn't include spring-boot-starter-actuator (and the codebase already exposes /health/live and /health/ready). As written, containers will be marked unhealthy due to a 404. Update the HEALTHCHECK to hit an existing endpoint (e.g. /health/ready) or add Actuator and ensure the endpoint is enabled in config.

Suggested change
CMD wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health || exit 1
CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health/ready || exit 1

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ENTRYPOINT ["java", "-jar", "app.jar"]
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