Question 413880 in Docker Question posted in
The official documentation can be found here.

Set docker port mapping when debugging ASP.NET Core Web API

I created an ASP.NET Core Web API project with docker support as follows:

Project

Each time the docker container gets created, the port mapping changes

First

…and changes…

Second

…and changes.

Third

I am not able to figure out how to set the port mapping in Visual Studio so that the container always launches with the same port mapping when I start debugging. Can anyone help?

Note: I already tried to add docker compose support but this ended up in having two mappings 8080:<random> and 8080:<what i defined> when running the docker port command – and it didn’t work.

Comment on solution

As the symptoms were really misleading for me, the following comment might help others: It was enough to run the project with DockerfileRunArguments enabled once to get rid of the duplicate port mapping issue when using docker compose!

Tags:

2

Answers


  1. 0

    In your project properties add the next:

    <PropertyGroup>
    ...
    <DockerfileRunArguments>-p 5001:8080</DockerfileRunArguments>
</PropertyGroup>

    It will allow you to access your web app via port 5001 during the debug
    http://localhost:5001/api/

    Just make sure that your port mapping does match to what says in the docker file with EXPOSE command.

    Here is some info about properties that you can use – https://learn.microsoft.com/en-us/visualstudio/containers/container-msbuild-properties?view=vs-2022

    Login or Signup to reply.
  2. 0

    If you’re running a single container:
    I’d recommend instead setting httpPort in the launch profile:

    "Container (Dockerfile)": {
  "commandName": "Docker",
  "launchBrowser": true,
  "launchUrl": "{Scheme}://{ServiceHost}:{ServicePort}",
  "environmentVariables": {
    "ASPNETCORE_HTTP_PORTS": "8080"
  },
  "publishAllPorts": false,
  "httpPort": 5001,
  "useSSL": false
}

    This has the benefit of the launch URL also getting updated implicitly.

    If you’re running using the compose tools you can update the port bindings in docker-compose.override.yml:

    webapplication25:
  environment:
    - ASPNETCORE_ENVIRONMENT=Development
    - ASPNETCORE_HTTP_PORTS=8080
  ports:
    - "5001:8080"
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search