⛵Day 14 Task: 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. 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.

🗼Here are some of the most commonly used commands in a Dockerfile:

• FROM: Specifies the base image that the new image will be built on top of. For example, you might use an official Node.js image as the base for an application that runs on Node.js.

• RUN: Executes a command in the image. This command is run during the image build process. For example, you might use the RUN command to install necessary packages or dependencies for your application.

• COPY: Copies files from the host machine to the image. For example, you might use the COPY command to copy the files for your application into the image.

• ENV: Sets an environment variable in the image. For example, you might use the ENV command to set a variable that holds the version of your application.

• EXPOSE: Specifies the ports that should be exposed on the container. For example, you might use the EXPOSE command to specify that port 8000 should be exposed on the container.

• CMD: Specifies the command that should be run when a container is created from the image. For example, you might use the CMD command to specify that your application should be started when the container is created.

Task:

Create a Dockerfile for a simple web application

• First I login to my docker machine and then write a docker file. name is Dockerfile.

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• 1. Build the image using the Dockerfile and run the container.

     

     

     Here the see how to build dockerfile using the command: docker build -t image name .

     1. 🗼Run the container

        

        here the see how to run container using command : docker run -d -p port no --name container name image

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

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          1. Push the image to a public or private repository =e.g. Docker Hub

        • 1. first login docker cmd:- docker login

             

             1. second gave the tag image cmd: docker tag images:tag username/tag

                

                1. push cmd: docker push image name

                   

                   1. we can see on dockerhub account;

                      

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