monolith

Containerize a monolithic application with docker init

docker init is a CLI tool that helps you create a Dockerfile for your app. It detects the platform and the main project of your app and generates a Dockerfile for you. The downside of this approach is that you need to manually add referencing projects to the Dockerfile if your app has project references.

Find the repository root

# Bazh/Zsh
REPOSITORY_ROOT=$(git rev-parse --show-toplevel)

# PowerShell
$REPOSITORY_ROOT = git rev-parse --show-toplevel

eShopLite.Store in .NET

1. Move to the monolith directory.

   cd $REPOSITORY_ROOT/monolith

2. Run docker init to create a new Dockerfile for the app.

   docker init

   Follow the prompts to create a Dockerfile for the app.

   • Choose ASP.NET Core as the application platform
   • Choose eShopLite.Store as the main project
   • Enter 9.0 as the .NET SDK version
   • Enter 8080 as the host port number

3. Open the Dockerfile and add the RUN instruction below:

   # Find this line
   COPY --from=build /app .
   
   # Add the following RUN instruction
   RUN chown $APP_UID /app

   # Find this line
   USER $APP_UID
   
   # Add the following RUN instruction
   RUN touch /app/Database.db

4. Build the container image.

   # To follow the build platform
   docker build -t eshoplite-store:latest .
   
   # To specify the target platform
   docker build --platform=linux/amd64 --build-arg TARGETARCH=amd64 -t eshoplite-store:latest .

5. Run a container from the container image.

   docker run -d -p 8080:8080 --name store eshoplite-store:latest

6. Open the browser and navigate to http://localhost:8080 to see the web app running.

7. Stop and remove the container.

   docker stop store
   docker rm store --force

8. Delete the container image.

   docker rmi eshoplite-store:latest --force