Setting Up Docker on a VM and Managing a Web Application Repository

Module 5: Assignment - 1

Tasks To Be Performed:

1. Install a Docker using VM
2. Pull hshar/webapp (webapp) repository
3. Create a new file in this repository

Step 1: Install Docker on a Virtual Machine §

1. I Create a Linux VM:

   • Will use the VM from Assignment 5: Module 4

2. I Install Docker Using docker.io: ^f947ef

   • I run the following commands to update the package index and install Docker from the Ubuntu repositories: sudo apt-get update sudo apt-get install docker.io
   • After the installation, I start and enable Docker to ensure it’s running and set to start on boot: sudo systemctl start docker sudo systemctl enable docker
   • I verify Installation sudo docker --version
     

Step 2: Pull the hshar/webapp Docker Repository §

1. I Pull the Docker Image:
   • I use the Docker command to pull the hshar/webapp image from Docker Hub: sudo docker pull hshar/webapp
     

Step 3: Create a New File in the Repository §

1. I Run a Container from the Pulled Image:

   • I start a Docker container using the hshar/webapp image: sudo docker run -dit --name webapp-container hshar/webapp

2. I Access the Container’s Shell:

   • I access the shell of the running container: sudo docker exec -it webapp-container bash

3. I Create a New File in the Container:

   • Inside the container, I navigate to the desired directory.
   • I create a new file touch newfile.txt

Step 4: Commit the Changes to Create a New Docker Image §

1. Commit the Container to a New Image:

   • Use the docker commit command to create a new image from the container’s current state.
   • The syntax is docker commit [CONTAINER_ID] [new_image_name]:[tag].

2. Verify the New Image:

   • Use docker images to list all images and verify that your new image (mynewimage:latest) is there.

azureuser@VMCustomImage:~$ sudo docker commit f88acb1dcab07b1ae0 hshar/webapp_updated:latest
sha256:5d9250a92e2766f6b591a7ab647888a836ef9da9ea779a098abcce830ee2e284
azureuser@VMCustomImage:~$ sudo docker images
REPOSITORY             TAG       IMAGE ID       CREATED          SIZE
hshar/webapp_updated   latest    5d9250a92e27   8 seconds ago    303MB
<none>                 <none>    853e35c08c74   30 seconds ago   303MB
hshar/webapp           latest    0cbc1f535ed8   4 years ago      303MB
azureuser@VMCustomImage:~$