通过DevOps部署Logic App(标准版)遇Kudu 503服务不可用问题求助

部署不存在的Logic App（标准版）资源时，约每三次部署就会出现“Kudu服务不可用503”错误。部署分为两步：

基础设施部署 #

使用AzureResourceManagerTemplateDeployment@3任务部署ARM模板，部署成功后出现以下异常：

• App Service概览页面显示“error”而非运行时版本
• Kudu无响应
• 日志流不可用
• Azure门户活动日志中Validate操作失败，提示“网关未在指定时间内收到‘Microsoft.Web’的响应：504”

停止/启动应用或更换App Service Plan可临时解决此问题，且ASP的CPU/内存使用率接近0%，疑似未处理的运行时异常。

结合AzureFunctionApp@1部署应用时的问题 #

• 数分钟内Azure DevOps显示“No message found for this issue”
• 部署可能耗时长达45分钟，或失败并输出以下日志：

Starting: Deploying Standard Logic App

Task         : Azure Functions Deploy
Description  : Update a function app with .NET, Python, JavaScript, PowerShell, Java based web applications
Version      : 2.238.1
Author       : Microsoft Corporation
Help         : https://aka.ms/azurefunctiontroubleshooting

Got service connection details for Azure App Service:'logicapp-dev'
NOTE: Function app is VNet integrated.
Deleting App Service Application settings. Data: ["WEBSITE_RUN_FROM_ZIP","WEBSITE_RUN_FROM_PACKAGE"]
App Service Application settings are already present.
Validating deployment package for functions app before Zip Deploy
Package deployment using ZIP Deploy initiated.
##[error]Failed to deploy web package to App Service.
##[warning]Can't find loc string for key: KuduStackTraceURL
##[error]KuduStackTraceURL https://$logicapp-dev:***@logicapp-dev.scm.azurewebsites.net/api/vfs/LogFiles/kudu/trace
##[error]Error: Error: Failed to deploy web package to App Service. Service Unavailable (CODE: 503)
##[warning]Error: Failed to update deployment history. Error: Service Unavailable (CODE: 503)
App Service Application URL: https://logicapp-dev.azurewebsites.net
Finishing: Deploying Standard Logic App

点击Kudu跟踪日志链接可查看以下内容：

{
    "Message": "An error has occurred.",
    "ExceptionMessage": "Illegal characters in path.",
    "ExceptionType": "System.ArgumentException",
    "StackTrace": "   at System.IO.Path.CheckInvalidPathChars(String path, Boolean checkAdditional)\r\n   
    at System.IO.Path.Combine(String path1, String path2)\r\n   
    at Kudu.Services.Infrastructure.VfsControllerBase.GetOriginalLocalFilePath() 
    in C:\\__w\\1\\s\\Kudu.Services\\Infrastructure\\VfsControllerBase.cs:line 327\r\n   
    at Kudu.Services.Infrastructure.VfsControllerBase.GetLocalFilePath() 
    in C:\\__w\\1\\s\\Kudu.Services\\Infrastructure\\VfsControllerBase.cs:line 316\r\n   
    at Kudu.Services.Infrastructure.VfsControllerBase.GetItem() 
    in C:\\__w\\1\\s\\Kudu.Services\\Infrastructure\\VfsControllerBase.cs:line 52\r\n   
    at lambda_method(Closure , Object , Object[] )\r\n   
    at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor
    
    ...continued...
}

已排除的排查项 #

已耗时约5天排查，排除以下因素：

• 应用本身（工作流、连接、参数、host.json等）
• API连接
• App Service Plan（尝试删除并升级）
• 应用运行时（尝试从dotnet切换回Node）
• ARM模板（Azure门户新建的Logic App ARM模板同样失败）
• 流水线任务（尝试使用AzureFunctionApp@2）
• Logic App名称（尝试重命名Logic App和文件共享，DEV/SIT环境初始成功但UAT环境仍出现相同错误）
• 存储账户防火墙（尝试启用公共访问）
• 手动部署文件共享（部署Logic App(标准版)会自动创建文件共享，除非设置WEBSITE_SKIP_CONTENTSHARE_VALIDATION为1）
• 通过Kudu删除部署文件夹（部分用户报告残留文件与DevOps和Azure的连接相关）

环境说明 #

• Logic App通过VNet集成使用单独资源组中的存储账户
• 存储账户配置了专用终结点，并允许受信任Azure服务访问
• 应用设置已配置WEBSITE_CONTENTAZUREFILECONNECTIONSTRING、WEBSITE_CONTENTOVERVNET和WEBSITE_SKIP_CONTENTSHARE_VALIDATION（存储文件共享已提前部署）
• App Insights未记录Logic App到存储账户文件共享的失败请求

请问是否有人遇到过部署Logic App(标准版)或Function App时出现此类Kudu 503错误？

内容的提问来源于stack exchange，提问作者altec