Deploying continuous Azure WebJob and WebApp blocks App

Question

I'm currently deploying one Azure WebJob with a corresponding Web App to Azure via Azure DevOps. My Web Job startup is mostly taken from various examples like https://github.com/Azure/azure-webjobs-sdk/tree/dev/sample/SampleHost

public class Program
{
    public static async Task Main()
    {
        IConfigurationRoot configRoot = null;

        var reg = new ServiceRegistry();
        reg.Scan(
            scanner =>
            {
                scanner.AssembliesFromApplicationBaseDirectory();
                scanner.LookForRegistries();
            });

        var builder = new HostBuilder()
            .ConfigureWebJobs(
                f =>
                {
                    f.AddAzureStorageCoreServices();
                    f.AddTimers();
                })
            .ConfigureAppConfiguration(
                (context, configurationBuilder) =>
                {
                    configurationBuilder.Sources.Clear();
                    configRoot = configurationBuilder
                        .SetBasePath(Directory.GetCurrentDirectory())
                        .AddJsonFile("appsettings.json", false, true)
                        .Build();
                })
            .ConfigureLogging(
                (context, b) =>
                {
                    b.AddApplicationInsightsWebJobs(
                        cfg =>
                        {
                            cfg.InstrumentationKey = "xxxx";
                        });

                    b.AddConsole();
                })
            .UseConsoleLifetime();

        var host = builder
            .UseLamar(reg)
            .Build();

        using (host)
        {
            var container = host.Services.GetService<IContainer>();
            var section = configRoot.GetSection(AppSettings.SectionKey);
            var settings = section.Get<AppSettings>();

            container.Configure(
                cfg =>
                {
                    cfg.AddSingleton(settings);
                });

            await host.RunAsync();
        }
    }
}

From what I understood, as I have a second file with functions like crontriggers, the webjob has to run in a continuous mode to stay alive. As I would like to deploy the webjob as part of the web app, I've added a YAML taks on the release-build, looking like this:

  - task: DotNetCoreCLI@2
    displayName: Publish Web Jobs
    inputs:
      command: publish

      publishWebProjects: false

      projects: 'Backend/Sources/Application/WebJobs/xxx.WebJobs.csproj'

      arguments: '--configuration $(BuildConfiguration) --output $(PublishPath)/App_Data/jobs/continuous/WebJobs /p:DeleteExistingFiles=True'

      zipAfterPublish: false

      modifyOutputPath: false

A variation of that task, is taken from https://www.rahulpnath.com/blog/azure-webjobs-dotnet-core-build-depoy/

After the build, I deploy the web app and the job in one go via a default configuration of the task "Azure App Service deploy".

What's interesting: If I start using this tasks and the code, the web app doesn't get properly deployed anymore. Checking the logs, I see that the web job is in fact deployed and immediately starts working. I would therefore think, the web job is now kindahow blocking the web app from being deployed completely, as it is already running (and probably locking stuff?)

The most examples I found are with former versions of the web jobs and also I don't find any examples, which mention this problem. Is it possible, this combination doesn't work and I would need to deploy web app and web job seperately, or is there another problem around?

Leo Liu-MSFT Leo Liu-MSFT · Accepted Answer · 2021-04-22T09:44:11

Is it possible, this combination doesn't work and I would need to deploy web app and web job seperately, or is there another problem around?

AFAIK, you do not need to deploy web app and web job separately.

If we deploy one Azure WebJob with a corresponding Web App, we need to create the WebJob project by right clicking on your Web App and choosing:

Add / New Azure WebJob project

Or if you already have a WebJobs project in the solution:

Add / Existing WebJob project

Besides, with webjob associated to web app, the webjob is included in the web app package, so you just need to deploy web app to azure app service.

It will generate webjob’s package too during publishing (there are two zip files), but you just need to specify web app package in Azure App Service deploy task. (Check Publish using Web Deploy option)

Deploying continuous Azure WebJob and WebApp blocks App

2 Answers