dotnet app in Docker container not seeing environment variables-CodePudding

I have a working dotnet application that I can run locally, as well, the same code runs in an azure web app. I have been able to containerize it. However, when I run it in the container it fails to read the environment variable:

Code to get/check environment variable in the controller:

        public ReportController(ILogger<ReportController> logger, IConfiguration iconfig)
        {
            _logger = logger;
            _config = iconfig;
            _storageConnString = Environment.GetEnvironmentVariable("AzureWebJobsStorage");
            _containerName = Environment.GetEnvironmentVariable("ReportContainer");
            string CredentialConnectionString = Environment.GetEnvironmentVariable("CredentialConnectionString");
            if(CredentialConnectionString == null)
            {
                throw new Exception("Credential connection string is null");
            }
        }

code in start up:

public static void Main(string[] args)
        {
           CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
                .ConfigureAppConfiguration((hostingContext, config) =>
                {
                    config.AddEnvironmentVariables();
                });
    ```

my docker compose that is setting the variables:


services:
  myreports:
    image: myreports    
    build:
      context: .
      dockerfile: myreports/Dockerfile
    ports: [5000:5000]
    environment:    
      - "APPSETTINGS_AzureWebJobsStorage = DefaultEndpointsProtocol=https;AccountName=mystorage;AccountKey=xxxx xx/xx==;EndpointSuffix=core.windows.net"

      - "APPSETTINGS_HarmonyConnectionString = Data Source=mydb.database.windows.net;AttachDbFilename=;Initial Catalog=Harmony;Integrated Security=False;Persist Security Info=False;User ID=sqlreporter;Password=mypass"
      - "APPSETTINGS_CredentialConnectionString = Data Source=mydb.database.windows.net;AttachDbFilename=;Initial Catalog=Credential;Integrated Security=False;Persist Security Info=False;User ID=sqlreporter;Password=mypass"
      - "CredentialConnectionString = Data Source=mydb.database.windows.net;AttachDbFilename=;Initial Catalog=Credential;Integrated Security=False;Persist Security Info=False;User ID=sqlreporter;Password=mypass"
      - "APPSETTINGS_ReportContainer = taxdocuments"

As you can see I'm attempting both the APPSETTINGS_ prefix and not

but when I hit the port in the app the container returns:

myreports-1  | System.Exception: Credential connection string is null

the code works fine the in the app service getting the variables

CodePudding user response：

You don't need to add APPSETTINGS_ in front of the variable names. What's causing the issue is the spaces around the equals sign in your docker-compose file. The quotes are not needed, so I'd remove them.

This should work

services:
  myreports:
    image: myreports    
    build:
      context: .
      dockerfile: myreports/Dockerfile
    ports: [5000:5000]
    environment:    
      - AzureWebJobsStorage=DefaultEndpointsProtocol=https;AccountName=mystorage;AccountKey=xxxx xx/xx==;EndpointSuffix=core.windows.net
      - HarmonyConnectionString=Data Source=mydb.database.windows.net;AttachDbFilename=;Initial Catalog=Harmony;Integrated Security=False;Persist Security Info=False;User ID=sqlreporter;Password=mypass
      - CredentialConnectionString=Data Source=mydb.database.windows.net;AttachDbFilename=;Initial Catalog=Credential;Integrated Security=False;Persist Security Info=False;User ID=sqlreporter;Password=mypass
      - ReportContainer=taxdocuments