CentOS 安装 NET Core SDK

1. 注册 Microsoft 密钥和源
   

   sudo rpm -Uvh https://packages.microsoft.com/config/centos/7/packages-microsoft-prod.rpm

2. 安装 .NET Core SDK
   

   sudo yum install dotnet-sdk-3.1

   在安装过程中如提示需要安装依赖的话执行：
   

   sudo yum install libunwind libicu

   若提示找不到安装包，说明yum源 需要升级则 更换yum源 centos更换阿里云的YUM源的方法

   1、备份
   
   mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
   
   2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/
   
   CentOS 5
   
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
   
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
   
   CentOS 6
   
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
   
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
   
   CentOS 7
   
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   
   3、之后运行yum makecache生成缓存

   更新完yum 后重新执行以下安装步骤即可

   sudo yum install libunwind libicu
   
   sudo yum install dotnet-sdk-3.1 

   安装完成后查看是否安装成功

   [bob@localhost ~]$ dotnet --info
   .NET Core SDK (reflecting any global.json):
    Version:   2.1.509
    Commit:    76b7a25db8
   
   Runtime Environment:
    OS Name:     centos
    OS Version:  8
    OS Platform: Linux
    RID:         centos.8-x64
    Base Path:   /usr/lib64/dotnet/sdk/2.1.509/
   
   Host (useful for support):
     Version: 3.1.3
     Commit:  4a9f85e9f8
   
   .NET Core SDKs installed:
     2.1.509 [/usr/lib64/dotnet/sdk]
   
   .NET Core runtimes installed:
     Microsoft.AspNetCore.App 3.1.3 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
     Microsoft.NETCore.App 2.1.13 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]
     Microsoft.NETCore.App 3.1.3 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]
   
   To install additional .NET Core runtimes or SDKs:
     https://aka.ms/dotnet-download