Docker file Configuration in .net core API

Question

Hi c# corner Team I'd like an example of how to configure a .NET Core API with Docker and create a Dockerfile for both the API and the database. How can I set it up so that running the Dockerfile or Docker Compose starts both the application and the database? Could you help me with this configuration?

Naimish Makwana · Answer

Here’s a basic example of how you can set up a .NET Core API with Docker and Docker Compose. This example includes a Dockerfile for the API and a Docker Compose file to start both the API and a SQL Server database. First let’s create a Dockerfile for the .NET Core API. This file will be used to create a Docker image of your application. # Dockerfile FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build WORKDIR /app # copy csproj and restore as distinct layers COPY *.csproj ./ RUN dotnet restore # copy everything else and build app COPY . ./ RUN dotnet publish -c Release -o out FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 AS runtime WORKDIR /app COPY --from=build /app/out ./ ENTRYPOINT [dotnet YourApp.dll] Replace YourApp.dll with the name of your application’s DLL file. Next let’s create a docker-compose.yml file. This file will be used to start both the API and the database. # docker-compose.yml version: '3.4' services: db: image: mcr.microsoft.com/mssql/server environment: SA_PASSWORD: Your_password123 ACCEPT_EULA: Y api: image: your-api-image-name build: context: . dockerfile: Dockerfile depends_on: - db Replace your-api-image-name with the name of your Docker image and Your_password123 with your chosen password. With these files you can use Docker Compose to start both the API and the database. Run the following command in the directory containing your docker-compose.yml file: docker-compose up This command will start both the API and the database. The API will be able to connect to the database using the service name db as the hostname. Please note that this is a basic example and might need to be adjusted based on your specific needs. For example you might need to adjust the Dockerfile to include any necessary environment variables or to handle multiple projects and you might need to adjust the Docker Compose file to include any necessary ports or volumes. Also remember to replace placeholders with your actual values. Thanks

Jaimin Shethiya · Answer

Hello Jobin Please refer the below links. https://code-maze.com/aspnetcore-app-dockerfiles/ https://www.twilio.com/en-us/blog/containerize-your-aspdotnet-core-application-and-sql-server-with-docker#:~:text=How%20to%20containerize%20your%20ASP.NET%20Core%20application%20andfor%20the%20Web%20API%20application%20...%20More%20items https://dev.to/moe23/step-by-step-guide-on-utilising-docker-compose-with-asp-net-core-sql-server-2e54 https://medium.com/@saurabh.singh0829/how-to-create-docker-compose-dockerfile-for-net-core-application-59390475b924 Thanks

Jignesh Kumar · Answer

Please refer below thread for reference https://dev.to/gbengelebs/how-to-containerize-an-asp-netcore-api-and-mysql-with-docker-compose-1m5c https://medium.com/@jaydeepvpatil225/containerization-of-the-net-core-7-web-api-using-docker-3abdd543f78a Sample for setting up API and dockker Create a .NET Core API : dotnet new webapi -n MyApi Create a Dockerfile for the API : # Use the official .NET Core SDK image as a build environment FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build-env # Set the working directory in the container WORKDIR /app # Copy the project file and restore dependencies COPY *.csproj ./ RUN dotnet restore # Copy the remaining source code COPY . ./ # Build the application RUN dotnet publish -c Release -o out # Use the official ASP.NET Core runtime image FROM mcr.microsoft.com/dotnet/aspnet:5.0 # Set the working directory in the container WORKDIR /app # Copy the built application from the build environment COPY --from=build-env /app/out . # Expose port 80 to the outside world EXPOSE 80 # Define the command to run the application ENTRYPOINT [dotnet MyApi.dll] Build and run the Docker image : docker build -t myapi . Run the Docker container: docker run -d -p 8080:80 --name myapi-container myapi Dockerfile for building and running SQL Server: # Use the official SQL Server 2019 image from Microsoft as a base image FROM mcr.microsoft.com/mssql/server:2019-latest AS build # Set environment variables ENV ACCEPT_EULA=Y ENV SA_PASSWORD=YourStrong!Passw0rd ENV MSSQL_PID=Express ENV MSSQL_TCP_PORT=1433 # Create a new directory for SQL Server database files RUN mkdir -p /var/opt/mssql/data # Copy the SQL Server setup script into the container COPY setup.sql /usr/src/app/setup.sql # Grant permissions to the SQL Server setup script RUN chmod +x /usr/src/app/setup.sql # Set the working directory to the directory containing the SQL Server startup script WORKDIR /usr/src/app # Run the SQL Server setup script on container startup CMD /bin/bash -c '/opt/mssql/bin/sqlservr & /usr/src/app/setup.sh' build and run the Docker image as follows: docker build -t sql-server . docker run -d -p 1433:1433 --name sql-server-container sql-server