DevOps-Containerization

Docker Volumes, Persistent Storage & Image Lifecycle Management (Windows Environment)

Overview

This practical session focuses on understanding Docker persistent storage mechanisms and complete image lifecycle management.
The lab demonstrates Docker volume creation, bind mounts, stateful container setup, container-to-image conversion, image backup, removal, restoration, and layer inspection using Docker Desktop on Windows.

Tools & Technologies Used

Windows 11
Docker Desktop
Command Prompt (CMD)
Ubuntu Docker Image
OpenJDK 17
Git & GitHub

PART A — Docker Volumes & Persistent Storage

Step 1: Create a Docker Volume

docker volume create myvolume
docker volume ls

Step 2: Run Ubuntu Container with Volume

docker run -it -v myvolume:/data ubuntu bash

Inside container:

cd /data
echo "Nitanshu DevOps Lab 27 Jan" > file.txt
cat file.txt
exit

Step 3: Verify Data Persistence

docker run -it -v myvolume:/data ubuntu bash

Inside container:

cd /data
cat file.txt
exit

Step 4: Bind Mount Example (Host Directory)

mkdir C:\dockerdata
docker run -it -v C:\dockerdata:/app ubuntu bash

Inside container:

cd /app
echo "Bind Mount Test" > bind.txt
exit

Host Verification:

dir C:\dockerdata

PART B — Custom Image Creation & Lifecycle

Step 5: Run Ubuntu Container

docker run -it --name java_container ubuntu bash

Inside container:

apt update
apt install openjdk-17-jdk -y
java -version
exit

Step 6: Commit Container into Image

docker commit java_container myrepo/java-img
docker images

Step 7: Run Custom Image

docker run -it myrepo/java-img bash

Inside container:

java -version
exit

Step 8: Save Image as Backup (.tar)

docker save -o java-image-backup.tar myrepo/java-img
dir java-image-backup.tar

Step 9: Remove Docker Image

docker rmi myrepo/java-img
docker images

Step 10: Restore Image

docker load -i java-image-backup.tar
docker images

Step 11: Inspect Image History

docker history myrepo/java-img

GitHub Version Control Setup

cd DevOps-Lab-Assignments
mkdir "Class Practical 27 Jan"
cd "Class Practical 27 Jan"
notepad README.md

Initialize Git & Push to GitHub

cd ..
git add .
git commit -m "Added Class Practical 27 Jan - Docker Volumes & Image Lifecycle"
git push

Result

Docker volume successfully created and verified.
Persistent storage confirmed using volume mounts.
Bind mount functionality validated.
Java-installed container committed into reusable image.
Docker image backup created using docker save.
Image removed and restored successfully using docker load.
Image layer history inspected.

Conclusion

This lab demonstrates stateful container management using Docker volumes and bind mounts, along with full Docker image lifecycle operations including commit, save, remove, load, and history inspection.
It validates Docker’s capability to manage persistence, portability, and recovery in DevOps environments.

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