无法安装在容器dotnet SDK 6.0和JDK 8中

Question

我需要安装在同一容器dotnet SDK 6.0和JDK 8中，我已实现以下dockerfile，但会创建容器，并且在审查Java时，该容器未安装

## dockerfile，

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM ubuntu:20.04 AS build-jdk
RUN apt-get update && \
    apt-get install -y openjdk-8-jre && \
    apt-get install -y ant && \
    apt-get clean;

# Fix certificate issues
RUN apt-get update && \
    apt-get install ca-certificates-java && \
    apt-get clean && \
    update-ca-certificates -f;

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
COPY --from=build-jdk ./* ./
COPY . .
# Setup JAVA_HOME -- useful for docker commandline        
ENV JAVA_HOME /app/usr/lib/jvm/java-8-openjdk-amd64/
RUN export JAVA_HOME
WORKDIR /src
COPY ["DigitalSignature.csproj", "./"]
RUN dotnet restore "DigitalSignature.csproj"
COPY . .
WORKDIR "/src/."
RUN dotnet build "DigitalSignature.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "DigitalSignature.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "DigitalSignature.dll"]

但在检查Java是否已安装时，它是否已安装，它是否已安装，不会出现

命令

java -version
Java -version 
printenv | env

检查Java和环境变量

Answer 1

您正在build dockerfile的阶段（from mcr.microsoft.com/dotnet/sdk:6.0 as Build）中复制和配置Java（构建您的.NET项目。该阶段在文件图像中不使用。因此，从该阶段没有明确复制到最后阶段的任何东西都会被抛弃。

我建议将安装/配置Java的命令移至Dockerfile的初始阶段，一个标记为base。 最终阶段基于base，因此图像中的任何内容都将可用。

在base阶段中，将其放置在Visual Studio中的“快速调试”容器功能时，可以使用它。

Answer 2

我能够解决下一个Dockerfile的问题

FROM ubuntu:18.04 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
# Install "software-properties-common" (for the "add-apt-repository")
RUN apt-get update && apt-get install -y \
    software-properties-common

## Install Oracle's JDK
# add oracle jdk repository
RUN add-apt-repository ppa:ts.sch.gr/ppa && \
# accept oracle license
    echo debconf shared/accepted-oracle-license-v1-1 select true | debconf-set- 
selections && \
    echo debconf shared/accepted-oracle-license-v1-1 seen true | debconf-set- 
selections && \
    apt-get update && \
# install oracle jdk 8 and make it default


apt-get -y install oracle-java8-installer && \
  apt-get -y install oracle-java8-set-default && \
# clean up
  apt-get clean all && \
  rm -rf /var/lib/apt/lists/*   

 Run wget https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb && \
     dpkg -i packages-microsoft-prod.deb && \
     rm packages-microsoft-prod.deb

 Run apt-get update; \
     apt-get install -y apt-transport-https && \
     apt-get update && \
     apt-get install -y dotnet-sdk-6.0

Run apt-get update; \
    apt-get install -y apt-transport-https && \
    apt-get update && \
    apt-get install -y aspnetcore-runtime-6.0


FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["DigitalSignature.csproj", "./"]
RUN dotnet restore "DigitalSignature.csproj"
COPY . .
WORKDIR "/src/."
RUN dotnet build "DigitalSignature.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "DigitalSignature.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENV ASPNETCORE_URLS=http://+:80
ENTRYPOINT ["dotnet", "DigitalSignature.dll"]