How to dockerize an application & build a Docker file image
Civo Academy - How to dockerize an application & build a Docker file image
Learn how to dockerize a Python application with Civo Academy. This lesson provides a step-by-step approach to creating a Docker file, building an image, and running a container.
Creating a Container
Dockerizing the Application
To dockerize our application, we need to create an image and then spawn containers on different environments. This process requires writing a Dockerfile, which is a set of instructions that define what the image should include, such as the application code, its libraries, and dependencies.
In our Dockerfile, we start with the
FROM instruction, which specifies the base image we'll use. This base image forms the initial layer of our Docker image. Choosing a verified base image to secure your application from vulnerabilities is a best practice.
Next, we use the
COPY instruction to copy the current directory's code into the
/app directory of the base image. The
WORKDIR command switches the directory to
/app, and the
RUN instruction executes the command
pip install flask within the image.
EXPOSE command specifies the port that should be exported during the container runtime, in this case, port 8080. The
CMD instructions define the system's default command, which cannot be overridden during runtime.
Building an Image from a Dockerfile
To build an image from a Dockerfile, we use the command
docker build -t, followed by the registry name where the image will be pushed. In our case, the Docker Hub account ID is
saiyam911/, and we provide the image name as
Running the Container in Detached Mode
If you want to run the container in detached mode and continue working with your development environment, you can use the command
docker run -d -p 8080:8080 saiyam911/dockerfile-demo:v1. This command runs the container in the background, allowing you to continue with other tasks.
In this lesson, we've dockerized a Python application, created an image, and run the application from a container. This process demonstrates the practicality and efficiency of containerization, a key concept in modern software development.
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