Table of contents
- Dockerfile
- Dockerfile Commands:
- Task 1: Create a Dockerfile for a simple web application (e.g. a Node.js or Python app)
- Task 2: Build the image using the Dockerfile and run the container
- Task 3: Verify that the application is working as expected by accessing it in a web browser
- Task 4: Push the image to a public or private repository (e.g. Docker Hub )
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. To create these containers, developers use something called a Dockerfile.
A Dockerfile is like a set of instructions for making a container. It tells Docker what base image to use, what commands to run, and what files to include. For example, if you were making a container for a website, the Dockerfile might tell Docker to use an official web server image, copy the files for your website into the container, and start the web server when the container starts.
Dockerfile Commands:
Here's a more concise and specific list of common Dockerfile commands:
FROM: Specifies the base image to build upon.COPYorADD: Copies files from the host machine to the image.RUN: Executes commands during the image build process.CMD: Sets the default command to run when the container starts.ENTRYPOINT: Sets the main executable for the container.ENV: Sets environment variables inside the container.EXPOSE: Informs Docker about the ports the container will listen on.VOLUME: Creates a mount point for data persistence.WORKDIR: Sets the working directory for the image.USER: Specifies the user context for the container.
Task 1: Create a Dockerfile for a simple web application (e.g. a Node.js or Python app)
We have a project with Django here, let's clone it
Let's make the dockerfile:
Task 2: Build the image using the Dockerfile and run the container
To check whether the image is build or not simply use:
docker images
Task 3: Verify that the application is working as expected by accessing it in a web browser
Task 4: Push the image to a public or private repository (e.g. Docker Hub )
Create a repository on Docker Hub
Login into your docker registry using docker login command:
Tag the image according to the repository you have created:
Push the image:
Check on the docker hub website if the image is uploaded or not.
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