如何將.net core 3.1網站應用程式透過container的方式部屬到heroku平台?
編輯Dockfile
.net core網站在docker容器內預設用80 port，但是Heroku平台容器會隨機指定一個port，並放入容器內環境變數 $PORT ，因此要修改網站的port為Heroku指定的port。
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| FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["myapp/myapp.csproj", "myapp/"]
RUN dotnet restore "myapp/myapp.csproj"
COPY . .
WORKDIR "/src/myapp"
RUN dotnet build "myapp.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "myapp.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
CMD dotnet myapp.dll --urls http://+:$PORT
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部屬到Heroku
先在本地端建立image，name必須符合Heroku的規定，再使用Heroku CLI推上平台就部屬完成了。
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| $ docker build -f .\myapp\Dockerfile -t registry.heroku.com/myapp/web .
$ heroku container:login
$ docker push registry.heroku.com/myapp/web:1.0
$ heroku container:release web -a myapp
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參考資料