Creating and managing volumes in Docker - Try It Yourself

Creating and managing volumes

📖 Scenario: You are working on a Docker project where you need to store data persistently outside of containers. This means even if a container is deleted, the data remains safe. Docker volumes help with this by providing a special storage area on your computer.In this project, you will create a Docker volume, use it in a container, and then check the volume's data to understand how volumes work.

🎯 Goal: Learn how to create a Docker volume, attach it to a container, write data inside the container to the volume, and verify the data persists after the container is removed.

📋 What You'll Learn

Create a Docker volume named mydata

Run a container using the busybox image with the volume mydata mounted at /data

Inside the container, create a file named hello.txt with the content Hello, Docker Volumes!

Verify the file exists in the volume by running another container and reading the file

Remove the first container and confirm the volume still holds the data

💡 Why This Matters

🌍 Real World

Docker volumes are used in real projects to keep databases, logs, and user files safe even when containers are updated or removed.

💼 Career

Understanding Docker volumes is essential for DevOps roles to manage persistent data in containerized applications reliably.

1

Create a Docker volume named mydata

Type the command to create a Docker volume called mydata.

Docker

# Your code here

Need a hint?

Use the docker volume create command followed by the volume name.

2

Run a container with the volume mydata mounted at /data

Run a Docker container using the busybox image with the volume mydata mounted to the container path /data. Name the container voltest and keep it running interactively.

Docker

docker volume create mydata
# Your code here

Need a hint?

Use docker run with -v mydata:/data to mount the volume and --name voltest to name the container.

3

Create a file hello.txt inside the container with specific content

Inside the running voltest container, create a file named /data/hello.txt containing the text Hello, Docker Volumes!. Use the echo command.

Docker

docker volume create mydata
docker run -it --name voltest -v mydata:/data busybox sh
# Your code here

Need a hint?

Use echo "Hello, Docker Volumes!" > /data/hello.txt to write the text into the file inside the mounted volume.

4

Verify the file exists in the volume by reading it from a new container

Exit the voltest container, then run a new busybox container with the volume mydata mounted at /data. Use the cat /data/hello.txt command to display the file content.

Docker

docker volume create mydata
docker run -it --name voltest -v mydata:/data busybox sh

echo "Hello, Docker Volumes!" > /data/hello.txt
# Your code here

Need a hint?

Use exit to leave the first container, then run docker run --rm -v mydata:/data busybox cat /data/hello.txt to read the file.