Mac本地运行.NET 8隔离模式Azure Timer函数启动失败求助

同一项目中HTTP触发函数可正常运行，但定时触发函数持续报错failed to acquire host lock lease和The listener for function 'Functions.SendNotificationTimer' was unable to start，日志显示连接127.0.0.1:10000被拒绝。已按Azure本地开发和Azurite官方文档配置，相关信息如下：

错误日志 #

[2024-03-10T20:42:50.803Z] The listener for function 'Functions.SendNotificationTimer' was unable to start.
[2024-03-10T20:42:50.803Z] The listener for function 'Functions.SendNotificationTimer' was unable to start. Azure.Core: Retry failed after 6 tries. Retry settings can be adjusted in ClientOptions.Retry or by configuring a custom retry policy in ClientOptions.RetryPolicy. (Connection refused (127.0.0.1:10000)) (Connection refused (127.0.0.1:10000)) (Connection refused (127.0.0.1:10000)) (Connection refused (127.0.0.1:10000)) (Connection refused (127.0.0.1:10000)) (Connection refused (127.0.0.1:10000)). Azure.Core: Connection refused (127.0.0.1:10000). System.Net.Http: Connection refused (127.0.0.1:10000). System.Net.Sockets: Connection refused.
[2024-03-10T20:43:09.115Z] Host instance '0000000000000000000000008F76DCB3' failed to acquire host lock lease: Azure.Core: Connection refused (127.0.0.1:10000). System.Net.Http: Connection refused (127.0.0.1:10000). System.Net.Sockets: Connection refused.
[2024-03-10T20:43:37.473Z] Host instance '0000000000000000000000008F76DCB3' failed to acquire host lock lease: Azure.Core: Connection refused (127.0.0.1:10000). System.Net.Http: Connection refused (127.0.0.1:10000). System.Net.Sockets: Connection refused.
[2024-03-10T20:44:03.701Z] Host instance '0000000000000000000000008F76DCB3' failed to acquire host lock lease: Azure.Core: Connection refused (127.0.0.1:10000). System.Net.Http: Connection refused (127.0.0.1:10000). System.Net.Sockets: Connection refused.
[2024-03-10T20:44:30.433Z] Host instance '0000000000000000000000008F76DCB3' failed to acquire host lock lease: Azure.Core: Connection refused (127.0.0.1:10000). System.Net.Http: Connection refused (127.0.0.1:10000). System.Net.Sockets: Connection refused.
[2024-03-10T20:44:47.967Z] Retrying to start listener for function 'Functions.SendNotificationTimer' (Attempt 8)

项目代码 #

SendNotificationTimer.cs #

using System;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.Logging;

namespace MyCompany.Notifications
{
    public class SendNotificationTimer
    {
        private readonly ILogger _logger;

        public SendNotificationTimer(ILoggerFactory loggerFactory)
        {
            _logger = loggerFactory.CreateLogger<SendNotificationTimer>();
        }

        [Function("SendNotificationTimer")]
        public void Run([TimerTrigger("*/30 * * * * *")] TimerInfo myTimer)
        {
            _logger.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");
            
            if (myTimer.ScheduleStatus is not null)
            {
                _logger.LogInformation($"Next timer schedule at: {myTimer.ScheduleStatus.Next}");
            }
        }
    }
}

program.cs #

using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.DependencyInjection;

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureServices(services => {
        services.AddApplicationInsightsTelemetryWorkerService();
        services.ConfigureFunctionsApplicationInsights();
    })
    .Build();

host.Run();

notificationFunction.csproj #

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Exe</OutputType>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <RootNamespace>_78127464</RootNamespace>
  </PropertyGroup>
  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.21.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.1.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="1.2.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Timer" Version="4.3.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.17.2" />
    <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.2.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
  <ItemGroup>
    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
  </ItemGroup>
</Project>

local.settings.json #

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
  }
}

host.json #

{
    "version": "2.0",
    "logging": {
      "logLevel": {
        "default": "Debug"
      },
        "applicationInsights": {
            "samplingSettings": {
                "isEnabled": true,
              "excludedTypes": "Request"
            },
            "enableLiveMetricsFilters": true
        }
    }
}

核心原因 #

定时触发函数需要借助Azure存储的Blob服务存储作业锁和调度状态，127.0.0.1:10000是Azurite Blob服务的默认端口，当前Azurite未正常启动或端口被占用，导致函数无法建立连接。

排查及修复步骤 #

1. 确认Azurite运行状态

   • 终端执行azurite启动服务，查看是否有报错。若提示端口被占用，指定新端口启动：

     azurite --blobPort 10001 --queuePort 10002 --tablePort 10003
     

   • 更新local.settings.json中的存储连接字符串，匹配自定义端口：

     "AzureWebJobsStorage": "DefaultEndpointsProtocol=http;AccountName=devstoreaccount1;AccountKey=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==;BlobEndpoint=http://127.0.0.1:10001/devstoreaccount1;QueueEndpoint=http://127.0.0.1:10002/devstoreaccount1;TableEndpoint=http://127.0.0.1:10003/devstoreaccount1;"
     

2. 重装Azurite保证完整性

   npm uninstall -g azurite
   npm install -g azurite
   

   优先使用最新稳定版。

3. 临时跳过存储依赖（仅调试用）
   若仅需验证定时函数逻辑，可在host.json中添加配置跳过存储（生产环境禁止使用）：

   {
     "version": "2.0",
     "logging": { ... },
     "extensions": {
       "timer": {
         "scheduleMonitor": {
           "skip": true
         }
       }
     }
   }
   

4. 更新Azure Functions Core Tools
   确保工具版本与.NET 8兼容，执行更新：

   brew upgrade azure-functions-core-tools@4
   

内容的提问来源于stack exchange，提问作者lcj