C#•2mo ago

Cannot connect my application to sql server on docker.

I tried to dockerise my asp.net application, but I get an error while applying migrations if I try to run locally. When I try doing it I have API turned off and SQL server turned on. Docker-Compose

version: '3.4'

name: fitness

services:
  api:
    container_name: api
    build:
      context: .
      dockerfile: API/Dockerfile
    ports:
      - "5000:8080"
    depends_on:
      - docker_sqlserver

  docker_sqlserver:
    container_name: docker_sqlserver
    build:
      context: .
      dockerfile: API/db.Dockerfile
    ports:
      - "1433:1433"

version: '3.4'

name: fitness

services:
  api:
    container_name: api
    build:
      context: .
      dockerfile: API/Dockerfile
    ports:
      - "5000:8080"
    depends_on:
      - docker_sqlserver

  docker_sqlserver:
    container_name: docker_sqlserver
    build:
      context: .
      dockerfile: API/db.Dockerfile
    ports:
      - "1433:1433"

Dockerfile for API

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
WORKDIR /App

COPY API/API.csproj ./API/

RUN dotnet restore API/API.csproj

COPY API/ ./API/

RUN dotnet publish API/API.csproj -c Release -o out

FROM mcr.microsoft.com/dotnet/aspnet:8.0

WORKDIR /App
EXPOSE 8080
COPY --from=build-env /App/out ./
ENTRYPOINT ["dotnet", "API.dll"]

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
WORKDIR /App

COPY API/API.csproj ./API/

RUN dotnet restore API/API.csproj

COPY API/ ./API/

RUN dotnet publish API/API.csproj -c Release -o out

FROM mcr.microsoft.com/dotnet/aspnet:8.0

WORKDIR /App
EXPOSE 8080
COPY --from=build-env /App/out ./
ENTRYPOINT ["dotnet", "API.dll"]

Dockerfile for SQL

FROM mcr.microsoft.com/mssql/server:latest AS sqlserver
ENV ACCEPT_EULA=Y
ENV SA_PASSWORD=myPassword1!

ENV MSSQL_DBNAME=FitnessApp

FROM mcr.microsoft.com/mssql/server:latest AS sqlserver
ENV ACCEPT_EULA=Y
ENV SA_PASSWORD=myPassword1!

ENV MSSQL_DBNAME=FitnessApp

My connection sting is: "Server=docker_sqlserver, 1433; Database=FitnessApp; User Id=sa; Password=myPassword1!; TrustServerCertificate=True;" The are 2 exceptions Inner Exception 1: SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.) Inner Exception 2: Win32Exception: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

5 Replies

✿ Scarlet ✿•2mo ago

Dont the ports appear when you expose a container in docker desktop?

XZetkaXOP•2mo ago

I see then on pc this is screen from laptop but they are viable in dockerfile I pasted

✿ Scarlet ✿•2mo ago

Can you access the db through dbms?

Jimmacle•2mo ago

the ports would appear for published ports, but that shouldn't be done unless you want the db to be accessible outside the container network

XZetkaXOP•2mo ago

yes, I found out that i have to use Server=docker_sqlserver, 1433; inside container Server=localhost, 1433; when i run locally

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Cannot connect my application to sql server on docker.