Parameters in .NET Core docker launchSettings.json

Question

I am writing an ASP.NET Core application and I have a launchSettings.json file with the following content:

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:50251",
      "sslPort": 44349
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "AspNetDockerDemo": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "https://localhost:5001;http://localhost:5000"
    },
    "Docker": {
      "commandName": "Docker",
      "launchBrowser": true,
      "launchUrl": "{Scheme}://{ServiceHost}"
    }
  }
}

Question: Where are the { } placeholders substituded and where are the values definied by which they are substituted? What will I have to do if I want to define such values on my own?

Posting some of your code can make you question more clear and it's more likely to get accurate answer. — Dimitar
– Dimitar, Commented Sep 21, 2018 at 13:58
Thank you for your response - actually the launchSettings.json file is a configuration for VisualStudio to config the execution environment. So there is no application code that will handle this data. The quetion is by what values the parameters Scheme and ServiceHost in the execution environment are set/replaced. — Daniel
– Daniel, Commented Sep 21, 2018 at 17:53
What is your asp.net core version and vs version? I made a test with asp.net core and docker, but, I did not see this useage. Please share us more information about this useage you know. — Edward
– Edward, Commented Sep 24, 2018 at 8:45
I am using ASP.NET Core 2.1 and Visual Studio 2017 (Version 15.8.5) — Daniel
– Daniel, Commented Sep 24, 2018 at 12:11

adam0101 · Accepted Answer · 2020-01-03 17:28:20Z

31

This doesn't answer your question, but if you're asking because you want consistent host port numbers while debugging like I did, you can do this by adding httpPort and sslPort to the launchSettings.json file.

answered Jan 3, 2020 at 17:28

adam0101

31.5k22 gold badges102 silver badges193 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

TheJugganaut Over a year ago

"httpPort" and "sslPort" will map the specified host port to the container's port "80" and "443", respectively.

Carlos Torrecillas Over a year ago

Very useful, thanks!

Pang · Accepted Answer · 2020-09-21 00:25:12Z

25

Since you're using Visual Studio's Docker integration, you've obviously noted that it randomly selects port mappings for you.

One way to change this is to right click on your asp.net core app, select Add -> Container Orchestration Support. This will attempt to regenerate your Dockerfile and .dockerignore files, which you may decline to do if you've made substantial modifications to your existing files (note: if you have, it may cause other issues with the following instructions). It will also generate some docker-compose settings for you in the form of several yaml files.

In my case, I was interested in the docker-compose.override.yml file it added to the project. Out of the box, it looks something like this:

version: '3.4'

services:
  coreapp:
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
    ports:
      - "80"

The ports: = "80" bit is what interests us. Change it to "<your desired port>:80" to specify a port to use:

version: '3.4'

services:
  coreapp:
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
    ports:
      - "8080:80"

edited Sep 21, 2020 at 0:25

Pang

10.2k146 gold badges87 silver badges126 bronze badges

answered Jun 19, 2019 at 17:11

bvoyelr

9909 silver badges12 bronze badges

4 Comments

Eric Sondergard Over a year ago

Good god does this need more upvotes. This totally solved my issues trying to integrate an app with social media logins (i.e.: static callback URLs).

Jean-Paul Over a year ago

@EricSondergard how did you solve the issues eventually I am running into Social redirects as well trying to locally debug it

Eric Sondergard Over a year ago

@Jean-Paul Yes, I did. I don't quite remember the exact situation, but I'll link you the project I was working on at the time. Hopefully you find what you need. github.com/esond/blazor-crud

Traderhut Games Over a year ago

Perhaps, I missed something here, but is this as totally unrelated to the OP's question about where do the ServiceHost and Schema come from? This is talking about ports, which was never asked about. (Which I don't get the comment about needing more upvotes..) And I never did see an answer about where to set the ServiceHost (I want to set it to 0.0.0.0 so it will map the port externally correctly)

prisar · Accepted Answer · 2018-10-04 07:36:35Z

0

Create a .env file and assign Scheme and ServiceHost.

Scheme=schemename
ServiceHost=localhost

answered Oct 4, 2018 at 7:36

prisar

3,2052 gold badges28 silver badges27 bronze badges

2 Comments

Daniel Over a year ago

I am not sure what you mean by .env file. Can you provide a documentation link or a more clear description?

prisar Over a year ago

If u r using docker-compose, the root directory will have an .env file

Collectives™ on Stack Overflow

Parameters in .NET Core docker launchSettings.json

3 Answers 3

2 Comments

4 Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

4 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related