Create_image_out_of_container.md

Create Image out of a Container

Usually we create a Image out of Dockerfile. But we can still create an image out of a container

Pre-requisites

1. Docker environment
2. dockerhub account

Procedure

Steps we are following

1. pull nginx image
2. Create a container
3. Do some changes on the container
4. Create an image using container
5. Push image to hub.docker.com
6. Remove container and image
7. create container using our custom image
8. We could able to see changes

Demonstration

1. Pull nginx docker image

   docker pull nginx:latest

2. Create a container using nginx image

   docker run -dt --name vtproxyuat01 -p 8080:80 nginx:latest 
   docker exec -it vtproxyuat01 /bin/bash
   	or
   docker run -it --name vtproxyuat01 -p 8080:80 nginx:latest /bin/bash

3. Modify index.html file on container

   cat >> /user/share/nginx/html/index.html

4. Create an image out of the container

   docker commit vtproxyuat01 <docker_account_id>/vtproxyimage:<tage_name>

5. Push image to dockerhub account

   docker push <docker_account_id>/vtproxyimage:<tage_name>

6. Remove containers and images

   docker stop vtproxyuat01
   docker rm vtproxyuat01
   docker system prune --all // to remove all stopped containers and unused images 

7. Create a container using image which we pushed to dockerhub.

   docker run -it --name vtproxyuat02 -p 8080:80 <docker_account_id>/vtproxyimage:<tage_name> /bin/bash

8. Check for the content in the file. We could see same our changes.

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