Table of contents

• Dockerfile

  • 📌Task:

Dockerfile

Dockerfile is a text file containing various instructions and configurations in the form of commands. Dockerfile helps to build a Docker image.

📝DockerFile Syntax:

FROM	:[taking base image from Docker Hub]
WORKDIR /app	:[Set the working directory in the container]
COPY . /app	:[Copy the current directory contents into the container at /app]
RUN	[Install any needed packages specified in requirements.txt for building the image]
EXPOSE	[Make port available to the world outside this container]
CMD	[Run specified command when the container launches]

📌Task:

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

  -Create a project directory on your ec-2 instance and clone the git repo where node.js source code is present

  

  -Write a Docker file in the project directory to build a Docker image for the application

  

  -Docker file created:

  

• Build the image using the Dockerfile and run the container

  -While creating the image I received the below message. When I checked the docker status then got to know the docker was installed but the service was inactive. I started the docker service and check the status, it was running.

  

  -Built docker image by running command docker build . -t <tag-name>

  

  

  -Verified created docker image:

  

  -To create a container from docker Image, run the command :
  [docker run -d -p 8001:8001 todo-app]

  

  -To check the running container [ docker ps -a]

  

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

  -Try to access aap through ec2 URL:

  

  -Enable Allowed host in settings.py file under the todoApp directory:

  

  

  -Deploy the image :

  

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

  -sign in to docker.hub registry and create a repository

  

  -Login into your docker registry using docker login command from the ec2 instance

  

  -If you try to push your image without tag name, can face below message:

  

  -Provide tag of the image according to the repository you have created:

  

  -Push your image to the docker hub:

  

  -Able to see the pushed image over the docker hub registry: