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--- docker_basic_dockerize [2020/01/24 19:43] – [Dockerfile] andonovj
+++ docker_basic_dockerize [2020/05/03 11:49] (current) – [Wrong ASP.NET] andonovj
@@ Line 157: / Line 157: @@
 </sxh>
-Now you can also download this simple web server from my docker hub.
+Now you can also download this simple web from your docker hub or list it as follows:
+<sxh bash>
+[root@postgresqlpgpool ~]# docker images
+REPOSITORY                             TAG                 IMAGE ID            CREATED             SIZE
+andonovj/httpserverdemo                latest              4ab730ac8ab5        6 hours ago         207MB
+[root@postgresqlpgpool ~]#
+</sxh>
+=====Troubleshooting=====
+You can have the following error:
+====Searching wrong Nuget====
+<Code: C#|Nuget Issue>
+  Restore completed in 41.36 ms for /app/HttpServerDemo.csproj.
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018: The "ResolvePackageAssets" task failed unexpectedly. [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018: NuGet.Packaging.Core.PackagingException: Unable to find fallback package folder 'C:\Program Files\dotnet\sdk\NuGetFallbackFolder'. [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at NuGet.Packaging.FallbackPackagePathResolver..ctor(String userPackageFolder, IEnumerable`1 fallbackPackageFolders) [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.NuGetPackageResolver.CreateResolver(IEnumerable`1 packageFolders) [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.NuGetPackageResolver.CreateResolver(LockFile lockFile) [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter..ctor(ResolvePackageAssets task) [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash) [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task) [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups() [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore() [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/app/HttpServerDemo.csproj]
+/usr/share/dotnet/sdk/3.1.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/app/HttpServerDemo.csproj]
+The command '/bin/sh -c dotnet publish -c Release -o out' returned a non-zero code: 1
+</Code>
+In that case, either:
+  * Delete the "obj" and "bin" folders from the directory
+  * Add a command to the "Dockerfile" to not upload these to the container as follows:
+<Code: bash| Edit Dockerfile>
+# copy and build everything else
+COPY . ./
+RUN find -type d -name bin -prune -exec rm -rf {} \; && find -type d -name obj -prune -exec rm -rf {} \;     <- This line
+ENTRYPOINT ["dotnet", "HttpServerDemo.dll"]
+</Code>
+====Wrong ASP.NET====
+Be careful about the dockerizing the application. I tried to build the application with ASP.NET 2.2 while the app was build with ASP.NET 3.1, so I had to update my Dockerfile as follows:
+<Code: bash| Updated Docker File>
+FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env                     <- This line
+WORKDIR /app
+# Copy csproj and restore as distinct layers
+COPY *.csproj ./
+RUN dotnet restore
+# Copy everything else and build
+COPY . ./
+RUN dotnet publish -c Release -o out
+# Build runtime image
+#FROM mcr.microsoft.com/dotnet/core/aspnet:2.2
+FROM mcr.microsoft.com/dotnet/core/sdk:3.1
+WORKDIR /app
+COPY --from=build-env /app/out .
+ENTRYPOINT ["dotnet", "HttpServerDemo.dll"]
+</Code>
+Otherwise, you will receive the following error:
+<Code: bash| Error for wrong ASP.NET version>
+It was not possible to find any compatible framework version
+The specified framework 'Microsoft.NETCore.App', version '3.1.0' was not found.
+  - Check application dependencies and target a framework version installed at:
+      /usr/share/dotnet/
+  - Installing .NET Core prerequisites might help resolve this problem:
+      https://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
+  - The .NET Core framework and SDK can be installed from:
+      https://aka.ms/dotnet-download
+  - The following versions are installed:
+.2.8 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]
+</Code>