asp.net core 9.0发布centos7.9

一：项目名称：Net9API

发布设置：

设置为Linux-64,独立部署：

将发布后的文件拷贝到centos制定文件夹，然后运行：

./Net9API

报错：

./Net9API: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by ./Net9API)
./Net9API: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by ./Net9API)

这里有一个大胆的推论：

其实运行时需要GLIBCXX_3.4.21文件而已，不需要升级GCC到5.2.0，但一般情况下需要通过升级GCC来获取GLIBCXX_3.4.21文件，另外升级的时候，并不要make install来升级GCC编译后的文件,只需要使用命令make -j8(用8线程编译，加快编译速度）来编译所需的文件，编译完成后，查找GLIBCXX_3.4.21文件：

find . -name "libstdc++.so*"

然后拷贝文件到/usr/lib64:

cp ./x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6.0.21 /usr/lib64

然后删除原来的软链接（或者更新也行），建立新软链接

rm -f libstdc++.so.6
ln -s libstdc++.so.6.0.21 libstdc++.so.6

再次运行NET9API，发现报错：

Couldn't find a valid ICU package installed on the system. Please install libicu (or icu-libs) using your package manager and try again. Alternatively you can set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support. Please see https://aka.ms/dotnet-missing-libicu for more information.
   at System.Environment.FailFast(System.Runtime.CompilerServices.StackCrawlMarkHandle, System.String, System.Runtime.CompilerServices.ObjectHandleOnStack, System.String)
   at System.Environment.FailFast(System.Threading.StackCrawlMark ByRef, System.String, System.Exception, System.String)
   at System.Environment.FailFast(System.String)
   at System.Globalization.GlobalizationMode+Settings..cctor()
   at System.Globalization.CultureData.CreateCultureWithInvariantData()
   at System.Globalization.CultureData.get_Invariant()
   at System.Globalization.CultureInfo..cctor()
   at System.Globalization.CultureInfo.get_CachedCulturesByName()
   at System.Globalization.CultureInfo.GetCultureInfo(System.String)
   at System.Reflection.RuntimeAssembly.GetLocale()
   at System.Reflection.RuntimeAssembly.GetName(Boolean)
   at Microsoft.Extensions.Hosting.HostBuilder.CreateHostingEnvironment(Microsoft.Extensions.Configuration.IConfiguration)
   at Microsoft.Extensions.Hosting.HostApplicationBuilder.Initialize(Microsoft.Extensions.Hosting.HostApplicationBuilderSettings, Microsoft.Extensions.Hosting.HostBuilderContext ByRef, Microsoft.Extensions.Hosting.IHostEnvironment ByRef, LoggingBuilder ByRef, MetricsBuilder ByRef)
   at Microsoft.Extensions.Hosting.HostApplicationBuilder..ctor(Microsoft.Extensions.Hosting.HostApplicationBuilderSettings)
   at Microsoft.AspNetCore.Builder.WebApplicationBuilder..ctor(Microsoft.AspNetCore.Builder.WebApplicationOptions, System.Action`1<Microsoft.Extensions.Hosting.IHostBuilder>)
   at Microsoft.AspNetCore.Builder.WebApplication.CreateBuilder(System.String[])
   at Program.<Main>$(System.String[])

然后按照网友描述，采用安装组件方法来解决（当然也有其他方法）：

Microsoft.ICU.ICU4C.Runtime

并在项目文件添加依赖：

<ItemGroup>
    <RuntimeHostConfigurationOption Include="System.Globalization.AppLocalIcu" Value="72.1.0.3"/>
</ItemGroup>

然后继续运行，发现正常。但需要配置对外访问的接口，在appsettings.json文件中添加配置：

  "Kestrel": { "Endpoints": { "http": { "Url": "http://0.0.0.0:5000" } } }

然后开启服务器防火墙，访问：

IP:5000/WeatherForecast/get

注意：如果API启动后控制台输出：Now listening on: http://0.0.0.0:5000说明配置正常，如果显示localhost...则说明对外配置端口错误。