I have a reverse proxy (nginx) in one container and a .net core api in another container. When running docker-compose build and docker-compose up in powershell this works as expected. The api is only reachable through the reverse proxy (at http://localhost:80).
I have set up docker-compose with visual studio and when running in visual studio with the same dockerfiles, docker-compose.yml, docker-compose.override.yml this does not work. I do not get an error and both container start up. But when trying to reach the api through the reverse proxy I get following error in the docker logs of the reverse proxy
2020/04/01 15:49:30 [error] 6#6: *8 connect() failed (111: Connection refused) while
connecting to upstream, client: 172.20.0.1, server: , request: "GET /api/health HTTP/1.1",
upstream: "http://172.20.0.2:5000/api/health", host: "localhost"
172.20.0.1 - - [01/Apr/2020:15:49:30 +0000] "GET /api/health HTTP/1.1" 502 559 "-"
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/80.0.3987.149 Safari/537.36"
This is my folder structure:
- ....
- RestApi (project folder folder)
- Dockerfile
- docker-compose.yml
- docker-compose.override.yml
- ReverseProxy (folder)
- Dockerfile
- nginx.conf
- ...
These are the files I use:
Dockerfile for .net core api:
FROM mcr.microsoft.com/dotnet/core/aspnet:2.1-stretch-slim AS base
WORKDIR /app
FROM mcr.microsoft.com/dotnet/core/sdk:2.1-stretch AS build
WORKDIR /src
COPY ["RestApi/RestApi.csproj", "RestApi/"]
COPY ["Services/Services.csproj", "Services/"]
COPY ["DataServices/DataServices.csproj", "DataServices/"]
COPY ["Entities/Entities.csproj", "Entities/"]
RUN dotnet restore "RestApi/RestApi.csproj"
COPY . .
WORKDIR "/src/RestApi"
RUN dotnet build "RestApi.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "RestApi.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENV ASPNETCORE_URLS http://+:5000
EXPOSE 5000
ENTRYPOINT ["dotnet", "RestApi.dll"]
Dockerfile for reverse proxy:
FROM nginx
COPY nginx.conf /etc/nginx/nginx.conf
ngingx conf file reverse proxy:
worker_processes 4;
events { worker_connections 1024; }
http {
sendfile on;
upstream app_servers {
server restapi:5000;
}
server {
listen 80;
location / {
proxy_pass http://app_servers;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Host $server_name;
}
}
}
docker-compose.yml:
version: '3.7'
services:
restapi:
build:
context: .
dockerfile: RestApi/Dockerfile
container_name: restapi
image: restapi:latest
expose:
- "5000"
reverseproxy:
build:
context: ./ReverseProxy
dockerfile: Dockerfile
container_name: reverseproxy
image: reverseproxy:latest
ports:
- "80:80"
links :
- restapi
docker-compose.override.yml:
version: '3.7'
services:
restapi:
volumes:
- ${USERPROFILE}/.aws:/root/.aws
environment:
- ASPNETCORE_ENVIRONMENT=Development
- AWS_REGION=eu-west-3
- AWS_PROFILE=default
And this is what visual studio makes of the file when running:
services:
restapi:
build:
context: D:\Repositories\dank\dank\api\RestApi
dockerfile: RestApi/Dockerfile
labels:
com.microsoft.created-by: visual-studio
com.microsoft.visual-studio.project-name: RestApi
target: base
container_name: restapi
entrypoint: tail -f /dev/null
environment:
ASPNETCORE_ENVIRONMENT: Development
AWS_PROFILE: default
AWS_REGION: eu-west-3
DOTNET_USE_POLLING_FILE_WATCHER: '1'
NUGET_FALLBACK_PACKAGES: ''
expose:
- '5000'
image: restapi:dev
labels:
com.microsoft.visualstudio.debuggee.arguments: ' --additionalProbingPath /root/.nuget/packages "bin/Debug/netcoreapp2.1/RestApi.dll"'
com.microsoft.visualstudio.debuggee.killprogram: /bin/sh -c "if PID=$$(pidof
dotnet); then kill $$PID; fi"
com.microsoft.visualstudio.debuggee.program: dotnet
com.microsoft.visualstudio.debuggee.workingdirectory: /app
tty: true
volumes:
- D:\Repositories\dank\dank\api\RestApi\RestApi:/app:rw
- C:\Users\Gebruiker\vsdbg\vs2017u5:/remote_debugger:rw
- C:\Users\Gebruiker\AppData\Roaming\ASP.NET\Https:/root/.aspnet/https:ro
- C:\Users\Gebruiker\.aws:/root/.aws:rw
- C:\Users\Gebruiker\AppData\Roaming\Microsoft\UserSecrets:/root/.microsoft/usersecrets:ro
- C:\Users\Gebruiker\.nuget\packages:/root/.nuget/packages:ro
- D:\Repositories\dank\dank\api\RestApi:/src:rw
reverseproxy:
build:
context: D:\Repositories\dank\dank\api\RestApi\ReverseProxy
dockerfile: Dockerfile
container_name: reverseproxy
image: reverseproxy:latest
links:
- restapi
ports:
- published: 80
target: 80
version: '3.7'
