.NET Core 通过 Docker 部署到 Droplet 错误：已使用运行时阶段名称答案

【问题标题】：.NET Core deployment to droplet via Docker error: Runtime stage name already used.NET Core 通过 Docker 部署到 Droplet 错误：已使用运行时阶段名称
【发布时间】：2019-10-03 22:04:47
【问题描述】：

我刚刚开始使用 Digitalocean、Dokku 和 Docker。环顾四周后，我没有发现任何解决此特定错误的方法。

我在将 .net 核心应用程序推送到运行 Ubuntu 18.04 的 Digitalocean droplet 时遇到此错误：

remote: Step 8/13 : RUN dotnet publish -c Release -o out
remote:  ---> Running in c6a4c4b610e6
remote: Microsoft (R) Build Engine version 16.0.450+ga8dc7f1d34 for .NET Core
remote: Copyright (C) Microsoft Corporation. All rights reserved.
remote:
remote:   Restore completed in 86.15 ms for /app/aspnetapp/aspnetapp.csproj.
remote:   aspnetapp -> /app/aspnetapp/bin/Release/netcoreapp2.2/aspnetapp.dll
remote:   aspnetapp -> /app/aspnetapp/bin/Release/netcoreapp2.2/aspnetapp.Views.dll
remote:   aspnetapp -> /app/aspnetapp/out/
remote: Removing intermediate container c6a4c4b610e6
remote:  ---> 40a01a03c830
remote: runtime stage name already used
To 159.89.150.200:aspnetapp
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'dokku@159.89.150.200:aspnetapp'

我已经修剪了 docker（docker system prune）并且列出的图像符合预期。

REPOSITORY                          TAG                 IMAGE ID            CREATED             SIZE
<none>                              <none>              3b46c96be3bf        3 minutes ago       1.75GB
mcr.microsoft.com/dotnet/core/sdk   2.2                 f41abe72b459        2 days ago          1.74GB
gliderlabs/herokuish                latest              fa3443ac31b2        2 months ago        1.21GB
gliderlabs/herokuish                v0.5.0              fa3443ac31b2        2 months ago        1.21GB
root@dokku-ubuntu1804-aspnetapp-round2:~#

我销毁了目标应用程序（dokku apps:destroy aspnetapp），重生它（dokku 应用程序：创建 aspnetapp），并将我的本地仓库推送到服务器。这并没有解决问题。

我创建了一个新的 droplet（预装了 Dokku 和 Docker），但问题仍然存在。

这是我的 Dockerfile：

FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS runtime
WORKDIR /app

# copy csproj and restore as distinct layers
COPY *.sln .
COPY aspnetapp/*.csproj ./aspnetapp/
RUN dotnet restore

# copy everything else and build app
COPY aspnetapp/. ./aspnetapp/
WORKDIR /app/aspnetapp
RUN dotnet publish -c Release -o out

FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
ENV ASPNETCORE_URLS http://*:5000 #
WORKDIR /app
COPY --from=build /app/aspnetapp/out ./
ENTRYPOINT ["dotnet", "aspnetapp.dll"]

谢谢！

【问题讨论】：

标签： c# docker asp.net-core .net-core asp.net-core-mvc

【解决方案1】：

你可以像这样使用缩短版

FROM microsoft/dotnet:2.2-aspnetcore-runtime

【讨论】：

【解决方案2】：

我在查看发布的 Dockerfile 时发现了这一点。

第一行应如下所示： FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build

【讨论】：