i have problems setting the ASPNETCORE_ENVIRONMENT variable running my project in a docker container. The problem is that the value is always set/overwritten to "Development".
I have tried setting the environment variable in my Dockerfile using
ENV ASPNETCORE_ENVIRONMENT test
also tried setting the environment variable in my docker-compose file using
environment:
- ASPNETCORE_ENVIRONMENT=test
When I set any other environment variable it works, for example:
environment:
- OTHER_TEST_VARIABLE=test
I assume that the value for ASPNETCORE_ENVIRONMENT variable is overwritten somewhere but I have difficulties finding out where.
I have added Docker support to an existing project and am running the project directly via Visual Studio's Docker/Docker compose option
The project runs on Asp Net Core 2.1
Thanks in advance
My launchSettings.json:
{
"iisSettings": {
"windowsAuthentication": false,
"anonymousAuthentication": true,
"iisExpress": {
"applicationUrl": "http://localhost:53183/",
"sslPort": 0
}
},
"profiles": {
"Docker": {
"commandName": "Docker",
"launchBrowser": true,
"launchUrl": "{Scheme}://localhost:{ServicePort}/api/values"
}
}
}
I also tried adding the environment variable configuration to the launchSettings.json
"Docker": {
"commandName": "Docker",
"launchBrowser": true,
"launchUrl": "{Scheme}://localhost:{ServicePort}/api/values",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "test"
}
}
My Webhost:
public static IWebHost BuildWebHost(string[] args)
{
return WebHost.CreateDefaultBuilder(args)
.ConfigureAppConfiguration((builderContext,config) =>
{
config.AddEnvironmentVariables();
})
.ConfigureLogging((hostingContext, logging) =>
{
logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
logging.AddConsole();
logging.AddDebug();
})
.UseStartup<Startup>()
.Build();
}
My docker-compose.yml
version: '3.4'
services:
api:
image: ${DOCKER_REGISTRY}api
build:
context: .
dockerfile: API/Dockerfile
environment:
- ASPNETCORE_ENVIRONMENT=test
My Dockerfile:
FROM microsoft/dotnet:2.1-aspnetcore-runtime AS base
WORKDIR /app
EXPOSE 80
FROM microsoft/dotnet:2.1-sdk AS build
WORKDIR /src
COPY API/API.csproj API/
RUN dotnet restore API/API.csproj
COPY . .
WORKDIR /src/API
RUN dotnet build API.csproj -c Release -o /app
FROM build AS publish
RUN dotnet publish API.csproj -c Release -o /app
FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "API.dll"]
Here is a list of the environment variables in the container
C:\Users\Administrator>docker exec -ti d6 /bin/bash
root@d6f26d2ed2c3:/app# printenv
HOSTNAME=d6f26d2ed2c3
ASPNETCORE_URLS=http://+:80
test1=asdasd
test2=dasdasd
test3=dasdasd
PWD=/app
HOME=/root
NUGET_FALLBACK_PACKAGES=/root/.nuget/fallbackpackages
DOTNET_USE_POLLING_FILE_WATCHER=1
ASPNETCORE_VERSION=2.1.3
DOTNET_RUNNING_IN_CONTAINER=true
TERM=xterm
SHLVL=1
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
ASPNETCORE_ENVIRONMENT=Development
_=/usr/bin/printenv
root@d6f26d2ed2c3:/app#
I had the same problem, I use Rider, I had the environment variable only on the docker-compose file in the service environment section.
What was happening on my end was I did not have ConnectionStrings set in my appsettings.Development.json so it defaulted to the appsettings.json file's ConnectionStrings.
I after adding the proper connection string to the development json file everything worked fine with the docker-compose up command. Hope this helps someone as well.
It works for me by configuring ASPNETCORE_ENVIRONMENT with command dotnet CoreDocker.dll --environment="X"
Try to change dockerfile like below:
ENTRYPOINT ["dotnet", "CoreDocker.dll", "--environment=X"]
Thanks for your comments, I solved my issue. It was just my mistake.
My problem was that when I added Docker-Support to my project I already had a Dockerfile included in the project.
When VS generated files for Docker-support, there was a second Dockerfile created, and one of the Dockerfiles was renamed to "Dockerfile.original".
I was using the "Dockerfile" visible in the solution explorer (which was somehow mapped to the "Dockerfile.original" file in the filesystem)
It seems that in the background my changes where written to "Dockerfile.original" but this file wasn't used while docker-compose was running. It used the empty generated Dockerfile that wasn't visible in the Solution explorer.
In the docker-compose.override.yml file, you should find something like that:
version: '3.4'
services:
webapplication1:
environment:
- ASPNETCORE_ENVIRONMENT=Development # <==
In case you use the Docker integration for Visual Studio (debug container from within VS) you need to pay special attention to the defaults.
When the tooling is starting the debugger with a docker run [..] command, it supplies an -e "ASPNETCORE_ENVIRONMENT=Development" argument. You can overwrite this environment variable in the Properties/launchSettings.json.
Even though I can't see it in the issued command, in my testing I experienced another default variable ASPNETCORE_URLS=http://+:80 as well.
A good starting point to read about VS Docker Tooling is this blog post and the official documentation.
When you use the generic host in .Net-Core 3.0 you might encounter issues when you use the new generic DOTNET_ENVIRONMENT variable, since you will have two environments specified then. This can be hard to debug. So what I like to do is to unset all defaults initially and start fresh in my Properties/launchSettings.json:
{
"$schema": "http://json.schemastore.org/launchsettings.json",
"profiles": {
"Docker": {
"commandName": "Docker",
"environmentVariables": {
// Overwrite default VS Docker Tools environment variables first (ASPNETCORE_ENVIRONMENT=Development; ASPNETCORE_URLS=http://+:80)
// https://www.paraesthesia.com/archive/2019/06/18/tips-on-container-tools-for-visual-studio/
"ASPNETCORE_ENVIRONMENT": "",
"ASPNETCORE_URLS": "",
"DOTNET_ENVIRONMENT": "Production",
"DOTNET_URLS": "http://+:80"
}
}
}
}
For who work with linux container:
ENTRYPOINT export ASPNETCORE_ENVIRONMENT=Development && exec dotnet "app.dll"
Very stupid mistake I made.
I have VS 2019 and I added Docker support to my project. So, I have a Dockerfile for my WebApi and a docker-compose file.
Basically, I tried everything that you guys said above but nothing worked for me.
What I found out is that there was a docker-compose.override.yml which was setting these env varibales. Hope this helps somebody.