C#/.NET Core

Last updated 3rd June 2021


Web PaaS supports deploying .NET applications by allowing developers to define a build process and pass its variables to the .NET Core build environment.

Supported versions


To specify a .NET Core container, use the type property in your .platform.app.yaml.

type: 'dotnet:3.1'

Building the application

For simple applications, using the dotnet publish default framework-dependent deployment method is sufficient for building applications in .NET containers:

    build: |
        set -xe
        dotnet publish --output "$PLATFORM_OUTPUT_DIR" -p:UseRazorBuildServer=false -p:UseSharedCompilation=false

where PLATFORM_OUTPUT_DIR is the output directory for compiled languages available at build time.

Typically .NET Core builds will start a collection of build servers, which are helpful for repeated builds. On Web PaaS, however, if this process is not disabled, the build process will not finish until the idle timeout is reached.

As a result, it is recommended to include -p toggles that disable the Razor compiler for dynamic cshtml pages (UseRazorBuildServer) and the .NET msbuild compiler (UseSharedCompilation).

If making multiple builds is desired for your application, make sure to call dotnet build-server shutdown at the end of your build hook.

Running the application

.NET Core applications should be started using the web.commands.start directive in .platform.app.yaml. This ensures that the command starts at the right moment and stops gracefully when a re-deployment needs to be executed. Also, should the program terminate for any reason, it will be automatically restarted. Note that the start command must run in the foreground.

Incoming requests are passed to the application using either a TCP (default) or UNIX socket. The application must use the appropriate environment variable to determine the URI to listen on. In case of a TCP socket (recommended), the application must listen on, using the PORT environment variable.

There will be an Nginx server sitting in front of your application. Serving static content via Nginx is recommended, as this allows easy control of headers (including cache headers) and also has marginal performance benefits.

Note that HTTPS is also terminated at the Ngnix proxy, so the app.UseHttpsRedirection(); line in Startup.cs should be removed.

The following example configures an environment to serve the static content folders commonly found in ASP.NET MVC templates using Nginx, while routing other traffic to the .NET application.

      root: "wwwroot"
      allow: true
      passthru: true
        # Serve these common asset types with customs cache headers.
          allow: true
          expires: 300s

    start: "dotnet WebApplication1.dll"

You can also route all requests to the application unconditionally:

      allow: false
      passthru: true

    start: "dotnet WebApplication1.dll"

Project templates

Web PaaS offers project templates for .NET Core applications using the structure described above. They can be used as a starting point or reference for building your own website or web application.



This template deploys the ASP.NET Core framework. It includes a minimalist application skeleton for demonstration, but you are free to alter it as needed. It includes demonstration-level connections for MariaDB and a Redis cache server.

ASP.NET Core is an open-source and cross-platform .NET framework for building modern cloud-based web applications.


  • .NET 2.2
  • MariaDB 10.4
  • Redis 5.0
  • Automatic TLS certificates

View the repository on GitHub.

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