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Walkthrough새로운 Dockerfile이 추가되어 Spring Boot 애플리케이션을 빌드하고 실행합니다. 빌더 단계에서 Gradle 이미지를 사용하여 Gradle 설정 및 소스 코드를 복사하고, 빌드한 JAR을 생성합니다. 런타임 단계에서는 JRE 이미지를 기반으로 빌더에서 생성된 JAR을 복사하고 포트 8080을 노출하며 실행 진입점을 정의합니다. Changes
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Actionable comments posted: 2
🤖 Fix all issues with AI agents
In `@Dockerfile`:
- Around line 20-29: 런타임 Dockerfile이 현재 root로 컨테이너를 실행하므로 권한 상승 위험이 있으니 non-root
사용자로 실행되도록 수정하세요: 런타임 stage에 그룹/사용자(예: appuser, uid 1000)를 생성하고 WORKDIR /app 및
복사된 app.jar에 대해 소유권을 해당 사용자로 chown 한 뒤 ENTRYPOINT 실행 전에 USER appuser를 설정해 컨테이너가
root가 아닌 appuser로 시작되도록 하십시오 (참고 대상 토큰: WORKDIR, COPY --from=builder ...,
app.jar, ENTRYPOINT, USER).
- Line 25: The Dockerfile COPY uses a wildcard that matches multiple JARs (COPY
--from=builder /app/build/libs/*.jar app.jar) causing the build to fail; fix by
either disabling the plain jar in the Gradle build (add tasks.named('jar') {
enabled = false } to server/build.gradle so only the bootJar remains) or by
making the Dockerfile copy a single, explicit artifact (replace the wildcard
with the exact boot JAR filename or a pattern that matches only the boot JAR).
Ensure the Docker COPY references the single artifact produced by bootJar to
avoid multiple-match errors.
🧹 Nitpick comments (1)
Dockerfile (1)
7-17: Gradle 의존성 캐싱 레이어 누락현재 구조에서는 소스 코드가 변경될 때마다 의존성을 매번 다시 다운로드합니다. Gradle 설정 파일 복사 후 의존성을 먼저 다운로드하는 레이어를 추가하면 빌드 속도를 크게 개선할 수 있습니다.
♻️ 의존성 캐싱 레이어 추가 제안
# Copy gradle files COPY server/build.gradle server/settings.gradle server/gradlew ./ COPY server/gradle ./gradle +# Make gradlew executable +RUN chmod +x ./gradlew + +# Pre-download dependencies (cached unless build.gradle changes) +RUN ./gradlew dependencies --no-daemon + # Copy source code COPY server/src ./src -# Make gradlew executable -RUN chmod +x ./gradlew - # Build the application RUN ./gradlew bootJar --no-daemon
| FROM eclipse-temurin:17-jre | ||
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| WORKDIR /app | ||
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| # Copy the built jar from builder stage | ||
| COPY --from=builder /app/build/libs/*.jar app.jar | ||
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| EXPOSE 8080 | ||
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| ENTRYPOINT ["java", "-jar", "app.jar"] |
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컨테이너가 root 사용자로 실행됩니다
런타임 스테이지에서 non-root 사용자를 지정하지 않아 컨테이너가 root로 실행됩니다. 컨테이너 탈출 취약점 발생 시 호스트에 대한 권한 상승 위험이 있습니다.
🔒 non-root 사용자 추가 제안
FROM eclipse-temurin:17-jre
WORKDIR /app
+RUN addgroup --system appgroup && adduser --system --ingroup appgroup appuser
+
# Copy the built jar from builder stage
COPY --from=builder /app/build/libs/*.jar app.jar
+USER appuser
+
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "app.jar"]📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| FROM eclipse-temurin:17-jre | |
| WORKDIR /app | |
| # Copy the built jar from builder stage | |
| COPY --from=builder /app/build/libs/*.jar app.jar | |
| EXPOSE 8080 | |
| ENTRYPOINT ["java", "-jar", "app.jar"] | |
| FROM eclipse-temurin:17-jre | |
| WORKDIR /app | |
| RUN addgroup --system appgroup && adduser --system --ingroup appgroup appuser | |
| # Copy the built jar from builder stage | |
| COPY --from=builder /app/build/libs/*.jar app.jar | |
| USER appuser | |
| EXPOSE 8080 | |
| ENTRYPOINT ["java", "-jar", "app.jar"] |
🤖 Prompt for AI Agents
In `@Dockerfile` around lines 20 - 29, 런타임 Dockerfile이 현재 root로 컨테이너를 실행하므로 권한 상승
위험이 있으니 non-root 사용자로 실행되도록 수정하세요: 런타임 stage에 그룹/사용자(예: appuser, uid 1000)를 생성하고
WORKDIR /app 및 복사된 app.jar에 대해 소유권을 해당 사용자로 chown 한 뒤 ENTRYPOINT 실행 전에 USER
appuser를 설정해 컨테이너가 root가 아닌 appuser로 시작되도록 하십시오 (참고 대상 토큰: WORKDIR, COPY
--from=builder ..., app.jar, ENTRYPOINT, USER).
| WORKDIR /app | ||
|
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||
| # Copy the built jar from builder stage | ||
| COPY --from=builder /app/build/libs/*.jar app.jar |
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🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
# Find and display build.gradle to check for plain JAR configuration
fd build.gradle -type f --exec cat {}Repository: OneBiteArticle/oba_backend
Length of output: 240
🏁 Script executed:
#!/bin/bash
# Find and display Dockerfile to verify the COPY command on line 25
fd Dockerfile -type f --exec cat -n {}Repository: OneBiteArticle/oba_backend
Length of output: 240
🏁 Script executed:
#!/bin/bash
# Check for Spring Boot gradle plugin configuration and JAR settings
fd -e gradle -type f --exec grep -l "bootJar\|plain.*jar\|jar.*enabled" {} \;Repository: OneBiteArticle/oba_backend
Length of output: 240
🏁 Script executed:
#!/bin/bash
# Find build.gradle files
fd build.gradleRepository: OneBiteArticle/oba_backend
Length of output: 89
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#!/bin/bash
# Find Dockerfile
fd DockerfileRepository: OneBiteArticle/oba_backend
Length of output: 80
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#!/bin/bash
# Display Dockerfile with line numbers
cat -n DockerfileRepository: OneBiteArticle/oba_backend
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🏁 Script executed:
#!/bin/bash
# Display server/build.gradle to check jar configuration
cat -n server/build.gradleRepository: OneBiteArticle/oba_backend
Length of output: 2037
🌐 Web query:
Spring Boot gradle plugin plain jar generation default behavior
💡 Result:
- Spring Boot Gradle plugin (Spring Boot ≤ 2.4.x): when
bootJaris configured, the plugin disables the standardjartask by default, so a “plain” jar is not produced unless you re-enablejar. [1] - Spring Boot Gradle plugin (Spring Boot ≥ 2.5.0 and still in Spring Boot 3.x): the plugin leaves
jarenabled, but configures it as a separate “plain” artifact by giving it the default classifierplain(so you typically getapp-plain.jaralongside the executablebootJar). You can disable the plain jar by disablingjar, or change classifiers if you don’t want theplainsuffix. [2][3]
Common knobs
- Don’t build the plain jar:
tasks.named("jar") { enabled = false }[3] - Don’t use the
plainclassifier (so the plain jar is justapp.jar): setarchiveClassifier = ""onjar(and optionally move a classifier tobootJar). [2][3]
Sources: Spring Boot Gradle Plugin reference (2.4) for “jar disabled by default”; Spring Boot Gradle Plugin reference (2.5 / 3.x) for “plain archive” behavior and how to disable or reclassify. [1][2][3]
🌐 Web query:
Docker COPY command multiple files wildcard pattern behavior
💡 Result:
- Wildcards are expanded by the Docker builder (not your shell), and each
<src>inCOPY <src>... <dest>may include wildcards matched using Go’sfilepath.Matchrules (e.g.*,?,[]). This is relative to the build context. [1] - If a wildcard (or multiple explicit sources) resolves to more than one source, then
<dest>must be a directory and must end with/(e.g.COPY *.png /dest/). [1] - For a single file source, if
<dest>ends with/, Docker treats it as a directory and writes the file as<dest>/<basename(src)>(i.e., it uses the source file’s basename). [1] - For a directory source, Docker copies the directory contents (not the directory entry itself). Subdirectories are copied/merged into the destination. [1]
- Builder implementations can differ (e.g., Docker vs Buildah/other tools) in edge cases like enforcing the “dest must end with
/” rule, so the same Dockerfile can behave differently across builders. [2] - If you need to preserve parent directories when copying matched files, BuildKit’s newer Dockerfile features support
COPY --parents ..., including examples using wildcards (and even**in that mode). [3]
Sources:
[1] Dockerfile reference (COPY / pattern matching / multi-source dest rules) — Docker Docs (docs.docker.com)
[2] Buildah issue discussing divergence from Docker’s trailing-slash rule for multi-source COPY (github.com)
[3] Docker blog: Dockerfile v1.7.0 capabilities (COPY --parents, wildcards, **) (docker.com)
Citations:
- 1: https://docs.docker.com/reference/builder?utm_source=openai
- 2: Inconsistent behavior when COPYing multiple files to /dest without trailing slash containers/buildah#4167
- 3: https://www.docker.com/blog/new-dockerfile-capabilities-v1-7-0/?utm_source=openai
Docker 빌드 실패: 와일드카드로 인한 다중 JAR 매칭 문제
Spring Boot 3.5.4에서는 기본적으로 bootJar 외에도 *-plain.jar 파일을 생성합니다. COPY --from=builder /app/build/libs/*.jar app.jar 명령은 두 개의 JAR 파일과 매칭되는데, 목적지(app.jar)가 디렉토리가 아니므로 Docker 빌드가 실패합니다.
server/build.gradle에 다음을 추가하여 plain JAR 생성을 비활성화하거나, Dockerfile의 경로를 더 구체적으로 지정하세요:
♻️ build.gradle에 plain JAR 비활성화 추가
tasks.named('jar') {
enabled = false
}🤖 Prompt for AI Agents
In `@Dockerfile` at line 25, The Dockerfile COPY uses a wildcard that matches
multiple JARs (COPY --from=builder /app/build/libs/*.jar app.jar) causing the
build to fail; fix by either disabling the plain jar in the Gradle build (add
tasks.named('jar') { enabled = false } to server/build.gradle so only the
bootJar remains) or by making the Dockerfile copy a single, explicit artifact
(replace the wildcard with the exact boot JAR filename or a pattern that matches
only the boot JAR). Ensure the Docker COPY references the single artifact
produced by bootJar to avoid multiple-match errors.
1 participant
📌 개요
EC2 배포를 위한 Spring Boot Dockerfile 추가
✨ 주요 변경 사항
🔍 관련 이슈
🙏 To Reviewers
Summary by CodeRabbit
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