Docker - java netty_tcnative 问题

Question

我正在尝试对 4 个服务进行 dockerize，但其中一项服务出现问题。具体地，该服务实现为Spring Boot服务并使用Google Vision API。当构建图像并启动容器时，一切正常，直到到达使用 google Vision API 代码的部分。然后，在运行容器时出现以下运行时错误：

netty-tcnative unavailable (this may be normal)
java.lang.IllegalArgumentException: Failed to load any of the given libraries: [netty_tcnative_linux_x86_64, netty_tcnative_linux_x86_64_fedora, netty_tcnative_x86_64, netty_tcnative]
at io.grpc.netty.shaded.io.netty.util.internal.NativeLibraryLoader.loadFirstAvailable(NativeLibraryLoader.java:104) ~[grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.netty.shaded.io.netty.handler.ssl.OpenSsl.loadTcNative(OpenSsl.java:526) ~[grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.netty.shaded.io.netty.handler.ssl.OpenSsl.<clinit>(OpenSsl.java:93) ~[grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.defaultSslProvider(GrpcSslContexts.java:244) [grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:171) [grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.forClient(GrpcSslContexts.java:120) [grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder.buildTransportFactory(NettyChannelBuilder.java:385) [grpc-netty-shaded-1.18.0.jar!/:1.18.0]
at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:435) [grpc-core-1.18.0.jar!/:1.18.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createSingleChannel(InstantiatingGrpcChannelProvider.java:223) [gax-grpc-1.42.0.jar!/:1.42.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createChannel(InstantiatingGrpcChannelProvider.java:164) [gax-grpc-1.42.0.jar!/:1.42.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.getTransportChannel(InstantiatingGrpcChannelProvider.java:156) [gax-grpc-1.42.0.jar!/:1.42.0]
at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:157) [gax-1.42.0.jar!/:1.42.0]
at com.google.cloud.vision.v1.stub.GrpcImageAnnotatorStub.create(GrpcImageAnnotatorStub.java:84) [google-cloud-vision-1.66.0.jar!/:1.66.0]
at com.google.cloud.vision.v1.stub.ImageAnnotatorStubSettings.createStub(ImageAnnotatorStubSettings.java:120) [google-cloud-vision-1.66.0.jar!/:1.66.0]
at com.google.cloud.vision.v1.ImageAnnotatorClient.<init>(ImageAnnotatorClient.java:136) [google-cloud-vision-1.66.0.jar!/:na]
at com.google.cloud.vision.v1.ImageAnnotatorClient.create(ImageAnnotatorClient.java:117) [google-cloud-vision-1.66.0.jar!/:na]
at com.google.cloud.vision.v1.ImageAnnotatorClient.create(ImageAnnotatorClient.java:108) [google-cloud-vision-1.66.0.jar!/:na]

错误的完整日志文件可以在此链接中找到： 完整日志文件。

这是我的docker-compose.yml文件和导致问题的服务的Dockerfile ：

Docker文件

FROM maven:3.6.0-jdk-8-alpine
WORKDIR /app/back
COPY src src
COPY pom.xml .
RUN mvn clean package

FROM openjdk:8-jdk-alpine
RUN apk add --no-cache curl
WORKDIR /app/back

COPY --from=0 /app/back/target/imagescanner*.jar ./imagescanner.jar
COPY --from=0 /app/back/target/classes/API-Key.json .
ENV GOOGLE_APPLICATION_CREDENTIALS ./API-Key.json
EXPOSE 8088

ENTRYPOINT ["java", "-jar", "./imagescanner.jar"]

docker-compose.yml

version: '3'

services:
   front:
     container_name: demoLab_front
     build: ./front
     image: demolab/front:latest
     expose:
       - "3000"
     ports:
       - "8087:3000"
     restart: always
   back:
     container_name: demoLab_backGCV
     build: ./backGCV
     image: demolab/backgcv:latest
     depends_on:
       - lab
     ports:
       - "8088:8088"
     restart: always
   lab:
     container_name: demoLab_labGCV
     build: ./lab
     image: demolab/labgcv:latest
     expose:
       - "8089"
     ports:
       - "8089:8089"
     restart: always
   sift:
     container_name: demoLab_labSIFT
     build: ./detect-label-service
     image: demolab/labsift:latest
     expose:
       - "5000"
     ports:
       - "5000:5000"
     restart: always

编辑

经过一番谷歌搜索后，我发现： GRPC Java 示例无法在 Alpine Linux 上运行，因为所需的 libnetty-tcnative-boringssl-static 依赖于 glibc。Alpine 正在使用 musl libc，应用程序启动将失败，并显示与我类似的消息。我发现这个项目试图构建正确的图像，但对于很多人来说它似乎被破坏了（该构建不适用于我的情况）

Answer 1

通过替换 Dockerfile 的这一行解决了问题：

FROM openjdk:8-jdk-alpine

用这一行：

FROM koosiedemoer/netty-tcnative-alpine