asp.net core web.api应用程序无法启动答案

【问题标题】：asp.net core web.api application can't be startedasp.net core web.api应用程序无法启动
【发布时间】：2017-11-02 18:35:07
【问题描述】：

我尝试在 CentOS 上部署 asp.net web.api 应用程序。当我使用 dotnet /var/www/html/CoreApiTest.dll 手动运行它时，它工作正常（使用 apache 作为代理）。当我使用服务运行它时，我得到一个错误。这是服务代码：

[Unit]
Description=Example .NET Web API Application running on CentOS 7

[Service]
WorkingDirectory=/var/www/html/CoreApiTest
ExecStart=/usr/bin/dotnet /var/www/html/CoreApiTest.dll
Restart=always
# Restart service after 10 seconds if dotnet service crashes
RestartSec=10
SyslogIdentifier=dotnet-example
User=apache
Environment=ASPNETCORE_ENVIRONMENT=Production

[Install]
WantedBy=multi-user.target

我使用systemctl enable kestrel-CoreApiTest.service 安装它。然后启动它并检查状态：systemctl status kestrel-CoreApiTest.service 并得到这个错误：

kestrel-CoreApiTest.service - Example .NET Web API Application running on CentOS 7
   Loaded: loaded (/etc/systemd/system/kestrel-CoreApiTest.service; enabled; vendor preset: disabled)
   Active: activating (auto-restart) (Result: exit-code) since Thu 2017-11-02 21:27:35 MSK; 5s ago
  Process: 2093 ExecStart=/usr/bin/dotnet /var/www/html/CoreApiTest.dll (code=exited, status=1/FAILURE)
 Main PID: 2093 (code=exited, status=1/FAILURE)

Nov 02 21:27:35 aryumin.fvds.ru systemd[1]: kestrel-CoreApiTest.service: main process exited, code=exited, status=1/FAILURE
Nov 02 21:27:35 aryumin.fvds.ru systemd[1]: Unit kestrel-CoreApiTest.service entered failed state.
Nov 02 21:27:35 aryumin.fvds.ru systemd[1]: kestrel-CoreApiTest.service failed.

在日志中 (journalctl -u kestrel-CoreApiTest) 我看到了这个：

ov 02 20:59:47 aryumin.fvds.ru systemd[1]: Started Example .NET Web API Application running on CentOS 7.
Nov 02 20:59:47 aryumin.fvds.ru systemd[1]: Starting Example .NET Web API Application running on CentOS 7...
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: Welcome to .NET Core!
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: ---------------------
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: Learn more about .NET Core @ https://aka.ms/dotnet-docs. Use dotnet --help to see available command
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: Telemetry
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: --------------
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: The .NET Core tools collect usage data in order to improve your experience. The data is anonymous a
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: You can opt out of telemetry by setting a DOTNET_CLI_TELEMETRY_OPTOUT environment variable to 1 usi
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: You can read more about .NET Core tools telemetry @ https://aka.ms/dotnet-cli-telemetry.
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: System.UnauthorizedAccessException: Access to the path '/usr/share/httpd/.dotnet/2.0.0.dotnetFirstU
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: --- End of inner exception stack trace ---
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirectory, Func`2 e
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode)
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at System.IO.File.Create(String path)
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.Extensions.EnvironmentAbstractions.FileWrapper.CreateEmptyFile(String path)
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.DotNet.Configurer.FirstTimeUseNoticeSentinel.CreateIfNotExists()
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.DotNet.Configurer.DotnetFirstTimeUseConfigurer.PrintFirstTimeUseNotice()
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.DotNet.Configurer.DotnetFirstTimeUseConfigurer.Configure()
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.DotNet.Cli.Program.ConfigureDotNetForFirstTimeUse(INuGetCacheSentinel nugetCacheSentin
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, ITelemetry telemetryClient)
Nov 02 20:59:54 aryumin.fvds.ru dotnet-example[476]: at Microsoft.DotNet.Cli.Program.Main(String[] args)

我做错了什么？

【问题讨论】：

正如错误所说，您没有授予进程访问文件夹中文件的权限。 apache 用户需要访问权限。
@Sami Kuhmonen 据我了解，apache 用户可以完全访问此文件夹：stat 2.0.0.dotnetFirstUseSentinel 文件：'2.0.0.dotnetFirstUseSentinel' 大小：6 块：0 IO 块：4096 目录设备: fd02h/64770d Inode: 51363393 链接: 2 访问: (0777/drwxrwxrwx) Uid: (48/ apache) Gid: (48/ apache)
@AlexeyRumin 检查进程实际运行的用户。我不熟悉 CentOS 或根据您的配置描述服务，但我会说这就是问题所在。另外，尝试使用sudo su apache，然后查看是否可以以 apache 用户身份运行该应用。

标签： c# asp.net .net asp.net-core

【解决方案1】：

dotnet CLI 正在尝试将文件写入用户配置文件以记录它已显示首次运行消息的事实。这会失败，因为服务用户没有可写的配置文件目录。

您可以将以下内容添加到您的 [Service] 部分，以防止 dotnet 显示此消息并创建此文件：

Environment=DOTNET_PRINT_TELEMETRY_MESSAGE=false

【讨论】：