containers/slides/custom/Exercise_Dockerfile.md

Exercise — writing Dockerfiles

1. Check out the code repository:

   git clone https://git.verleun.org/training/docker-build-exercise.git
   

2. Add a Dockerfile that will build the image:

   • Use python:3.9.9-slim-bullseye as the base image (FROM line)

   • Expose port 8000 (EXPOSE)

   • Installs files in '/usr/local/app' (WORKDIR )

   • Execute the command uvicorn app:api --host 0.0.0.0 --port 8000

3. Build the image with docker build -t exercise:1 .

4. Run the image: docker run -d -p 8123:8000 exercise:1

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Again, with docker-compose (optional)

Create a docker-compose.yml with the following content:

version: "3"
services:
  app:
    build: .
    ports:
    - 8123:8000

Start the container: docker-compose up -d