Docker Project for DevOps Engineers

Dockerfile

Docker is a tool that makes it easy to run applications in containers. Containers are like small packages that hold everything an application needs to run. A Dockerfile is a text file that contains a set of instructions that are used to create a Docker image. A typical Dockerfile consists of several steps, each of which corresponds to a specific action in the build process. These steps are executed in order, and the resulting image is built layer by layer.

In this blog, we will create a docker container to run our application in any environment and to do this we will follow below steps:

Task:

1. Create a Dockerfile for a simple web application (e.g. a Node.js or Python app)

   Here we are creating a Dockerfile for react_django_demo_app. But before that follow the below steps:

   git clone https://github.com/prshende/react_django_demo_app.git

   This will copy the project code from the GitHub repository to your local.

   

   Now create a Dockerfile based on the application requirements,

   

   This Dockerfile uses the official Python 3.9 image as the base image and sets the working directory to /app. It then copies the contents of the current directory to the /app directory in the container. Next, it installs the required packages specified in the requirements.txt file using pip. It exposes port 8001 for the Django application to listen on. Finally, it runs the python manage.py runserver 0.0.0.0:8001 command to start the Django development server and make the application available on port 8001.

2. Build the image using the Dockerfile and run the container

   sudo docker build . -t react-django-app:latest

   By using the above command it will create a Docker image for us by using Dockerfile.

   

   

   You can check the Docker images by using the below command,

   

   Now we have to convert the Docker image to the container by using the below command,

   sudo docker run -d -p 8001:8001 react-django-app:latest

   We can check the containers using docker ps command,

   

3. Verify that the application is working as expected by accessing it in a web browser

   To check the application working you have to do certain steps:

   Add rule in your inbound rule to expose port 8001,

   

   The application is now up and running,

   

4. Push the image to a public or private repository (e.g. Docker Hub )

   To push the Docker image to a public or private repository, follow these steps:

   Tag the image with the repository name using the following command:

   docker tag <image_id> <repository_name>:<tag>

   docker tag <7d536a556e64> <react-django-app>:<latest>

   Log in to the Docker registry using the following command:

   sudo docker login

5. Push the Docker image to the registry using the following command:

   docker push <repository_name>:<tag>

   sudo docker tag docker-app:latest pratik1052/django-app:latest

   sudo docker push pratik1052/django-app:latest

   

   

   Thank you for reading the blog.

   Suggestions are always welcome. Thank you !!