Here are the high-level steps to create a Docker container image and deploy it to an Azure Container Registry:
- Write a Dockerfile: A Dockerfile is a script that contains instructions for building a Docker image. It specifies the base image, any additional software packages, and any custom configurations that are needed for your application.
- Build the Docker image: Once you have written your Dockerfile, you can use the
docker buildcommand to build the Docker image. This command will read the instructions from your Dockerfile and create a new image based on those instructions.
- Tag the Docker image: After building the Docker image, you will need to tag it with a unique name that includes the name of your Azure Container Registry. For example, if your registry is named
myregistry.azurecr.io, you could tag your image as
- Login to Azure Container Registry: Before you can push the Docker image to your Azure Container Registry, you need to log in to the registry using the
az acr logincommand. This command will authenticate your Docker client with the registry.
- Push the Docker image: Once you are logged in to your Azure Container Registry, you can use the
docker pushcommand to push your Docker image to the registry. This command will upload the image to the registry and make it available for use.
Below are the detailed steps with commands:
- Write a Dockerfile: Create a new file named
Dockerfilein your project directory and add the following contents:
# Use an official Python runtime as a parent image FROM python:3.9-slim # Set the working directory to /app WORKDIR /app # Copy the current directory contents into the container at /app COPY . /app # Install any needed packages specified in requirements.txt RUN pip install --trusted-host pypi.python.org -r requirements.txt # Make port 80 available to the world outside this container EXPOSE 80 # Define environment variable ENV NAME World # Run app.py when the container launches CMD ["python", "app.py"]
This Dockerfile specifies that we want to use the official Python 3.9 image as the base image, set the working directory to
/app, copy the contents of our local directory to the container, install any needed packages specified in
requirements.txt, expose port 80, set an environment variable, and run
app.py when the container launches.
2. Build the Docker image:
Run the following command to build the Docker image:
docker build -t myregistry.azurecr.io/myimage:v1 .
This command will build the Docker image and tag it with the name
3. Login to Azure Container Registry:
Run the following command to log in to your Azure Container Registry:
az acr login –name myregistry
myregistry with the name of your Azure Container Registry.
4. Push the Docker image:
Run the following command to push the Docker image to your Azure Container Registry:
docker push myregistry.azurecr.io/myimage:v1
This command will upload the Docker image to your Azure Container Registry.
That’s it! You have now created a Docker container image and deployed it to an Azure Container Registry. You can now use this image to deploy your application to Azure Kubernetes Service or any other container orchestration platform that supports Docker images.