当 运行 作为服务时，WebApi 无法启动

Question

我有一个奇怪的问题。

运行 我的 web-api 这样的作品：

$ /usr/local/bin/dotnet /usr/local/bin/dotnetcoreapps/api/TestService.dll

我在 /etc/systemd/system/ 中创建了这个测试-service.service:

[Unit]
Description=DoorplateBackendService
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
Restart=always
RestartSec=1
User=pi
ExecStart=/usr/local/bin/dotnet /usr/local/bin/dotnetcoreapps/api/TestService.dll
KillSignal=SIGINT    

[Install]
WantedBy=network-online.target

不知何故我得到了这个异常，我不知道它来自哪里：

System.IO.IOException: Invalid argument
at System.IO.Enumeration.FileSystemEnumerator`1.FindNextEntry()
at System.IO.Enumeration.FileSystemEnumerator`1.MoveNext()
at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
at System.IO.FileSystemWatcher.RunningInstance..ctor(FileSystemWatcher watcher, SafeFileHandle inotifyHandle, String directoryPath, Boolean includeSubdirectories, NotifyFilters notifyFilters, CancellationToken cancellationToken)
at System.IO.FileSystemWatcher.StartRaisingEvents()
at System.IO.FileSystemWatcher.StartRaisingEventsIfNotDisposed()
at System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value)
at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.TryEnableFileSystemWatcher()
at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.CreateFileChangeToken(String filter)
at Microsoft.Extensions.FileProviders.PhysicalFileProvider.Watch(String filter)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.<.ctor>b__0_0()
at Microsoft.Extensions.Primitives.ChangeToken.OnChange(Func`1 changeTokenProducer, Action changeTokenConsumer)
at Microsoft.Extensions.Configuration.FileConfigurationProvider..ctor(FileConfigurationSource source)
at Microsoft.Extensions.Configuration.Json.JsonConfigurationSource.Build(IConfigurationBuilder builder)
at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors)
at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
at BrodicatorService.Program.Main(String[] args) in <my_dir>\Program.cs:line 23;

Program.cs - 第 23 行：CreateWebHostBuilder(args).Build().Run();

Answer 1

经过几个小时的调试和尝试不同的东西后，我最终更改了我的服务定义：

[Unit]
Description=MyTestService

[Service]
WorkingDirectory=/usr/local/bin/dotnetcoreapps/api
ExecStart=/usr/local/bin/dotnet /usr/local/bin/dotnetcoreapps/api/TestService.dll
Restart=always
RestartSec=10
KillSignal=SIGINT
User=root
Environment=ASPNETCORE_ENVIRONMENT=Production


[Install]
WantedBy=multi-user.target

我发现 this link 帮了大忙。

我不知道这里发生了什么。

Answer 2

我的 .NET 5 项目遇到了同样的问题，并尝试使用“.service”文件进行试验。

我的解决方案是将工作目录更改为“/tmp”。我认为它可以工作，因为我的应用程序位于已安装的网络磁盘 (NFS) 上。

MS Demo 服务器端项目工作正常，工作目录未设置为“/tmp”。

顺便说一句，我没有 ernogh 点可以评论，所以我 post 一个答案。