Docker 构建无法计算缓存 key

Question

我有以下项目结构

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----         4/22/2021   1:49 PM                App_Start
d-----         3/20/2020   3:35 PM                Areas
d-----          5/4/2021   7:01 PM                bin
d-----         3/20/2020   3:35 PM                Content
d-----          5/4/2021   5:59 PM                Controllers
d-----         3/20/2020   3:35 PM                fonts
d-----         8/20/2020   9:43 PM                obj
d-----          7/9/2020   8:43 PM                Properties
d-----         3/20/2020   3:35 PM                Scripts
d-----         3/20/2020   3:35 PM                Views
-a----          5/4/2021   6:00 PM             46 .dockerignore
-a----          5/4/2021   6:00 PM          45239 foo.csproj
-a----          5/4/2021  11:21 PM           1621 foo.csproj.user
-a----         4/22/2021   1:49 PM            390 ConnectionStrings.config
-a----          5/5/2021  12:17 AM            375 Dockerfile
-a----         3/20/2020   3:35 PM            116 Global.asax
-a----         3/20/2020   3:35 PM            717 Global.asax.cs
-a----         8/13/2020   1:05 PM           1770 NLog.config
-a----         3/20/2020   3:35 PM         159853 NLog.xsd
-a----          5/4/2021   6:00 PM           9217 packages.config
-a----         3/20/2020   3:35 PM          12294 UnityConfiguration30.xsd
-a----          5/4/2021   6:00 PM          29650 Web.config
-a----         3/20/2020   3:35 PM           1308 Web.Debug.config
-a----         3/20/2020   3:35 PM            705 Web.Release.config

我在 bin directory 中有一个目录那个名字是 app.publish .
我的 Dockerfile 如下所示:

#Depending on the operating system of the host machines(s) that will build or run the containers, the image specified in the FROM statement may need to be changed.
#For more information, please see https://aka.ms/containercompat

FROM mcr.microsoft.com/dotnet/framework/aspnet:4.8-windowsservercore-ltsc2019
ARG source
WORKDIR /inetpub/wwwroot
COPY bin/app.publish .

在我运行以下命令以从此 docker 文件构建镜像后

docker build -t soroshsabz/testcoreservice .

我收到以下错误

[+] Building 15.1s (7/7) FINISHED
 => [internal] load build definition from Dockerfile                                                               0.1s
 => => transferring dockerfile: 414B                                                                               0.0s
 => [internal] load .dockerignore                                                                                  0.1s
 => => transferring context: 34B                                                                                   0.0s
 => [internal] load metadata for mcr.microsoft.com/dotnet/framework/aspnet:4.8-windowsservercore-ltsc2019         14.9s
 => [1/3] FROM mcr.microsoft.com/dotnet/framework/aspnet:4.8-windowsservercore-ltsc2019@sha256:e1475e80eb3cbdfd81  0.1s
 => => resolve mcr.microsoft.com/dotnet/framework/aspnet:4.8-windowsservercore-ltsc2019@sha256:e1475e80eb3cbdfd81  0.1s
 => [internal] load build context                                                                                  0.1s
 => => transferring context: 2B                                                                                    0.0s
 => CACHED [2/3] WORKDIR /inetpub/wwwroot                                                                          0.0s
 => ERROR [3/3] COPY bin/app.publish .                                                                             0.0s
------
 > [3/3] COPY bin/app.publish .:
------
failed to compute cache key: "/bin/app.publish" not found: not found

我的问题是为什么我收到这个错误？以及如何解决？
我用 Docker Engine Community 20.10.6在 Windows 10 20H2 19042.964我看到 Docker - failed to compute cache key: not found - runs fine in Visual Studio和 some internal links ，但没有找到任何有用的东西。
我正在解决我的问题并发现了一些相同的问题，例如 Dockerfile can’t copy specified local directory & file或 Windows Docker Dockerfile COPY file inside folder .

Answer 1

Thanks to BMitch ，我发现了我的问题。问题是 dockerignore 文件包含一些不能与 COPY 匹配的模式。文件名。
我的问题是 dockerignore 文件中的模式与 bin/app.publish 错误匹配.为了解决我的问题，我只是更改了 dockerignore 中的模式。