List out the checklist of Docker Volume Commands

Docker volumes are a crucial feature in Docker that addresses the need for persistent and shared data storage when working with containers. Here are several reasons why Docker volumes are essential:

Data Persistence:

Docker containers are ephemeral by nature, meaning that any data stored within the container is lost when the container is removed. Docker volumes allow you to persist data beyond the lifecycle of a container, ensuring that important data is retained even if containers are stopped or removed.
Shared Data Between Containers:

Volumes enable the sharing of data between multiple containers. Containers that need access to the same data, configuration files, or resources can mount a shared volume, allowing them to read and write data to a common storage location.
Database Storage:

For database containers, it's crucial to persist data outside the container to ensure that the data survives container restarts or updates. Docker volumes provide a reliable way to store and manage database data separately from the container itself.
Configuration Files:

Volumes are commonly used to store configuration files that are read by various containers. This allows you to update configurations without modifying the container, making it easier to manage application settings.
External Storage Integration:

Docker volumes can be backed by external storage systems, such as network-attached storage (NAS) or cloud storage. This allows you to decouple your data from the local filesystem, providing flexibility and scalability.
Backup and Restore:

With data stored in volumes, it becomes easier to perform backups and restores. You can back up the data by copying the contents of the volume to a backup location, and in case of a failure, you can restore the data by recreating the volume and copying the data back.
Efficient Data Sharing with Host:

Volumes enable efficient sharing of data between the host and containers. Changes made to files in a volume are immediately reflected both in the container and on the host, making it a convenient mechanism for development workflows.
Containerized Development Environments:

Docker volumes are valuable in containerized development environments, where source code and project files are mounted into containers. This allows developers to use their preferred tools and IDEs while keeping the application code in sync with the containerized environment.
Reduction of Image Size:

By storing data in volumes, you can keep the size of your Docker images smaller. Important and frequently changing data can be stored in volumes, while the container image remains focused on the application code and dependencies.
Isolation of Data:

Docker volumes provide a level of isolation for data, allowing different containers to access the same data without interfering with each other. This isolation is crucial for maintaining the integrity of the data.
In summary, Docker volumes are essential for managing persistent data in Docker containers. They provide a flexible and efficient way to handle data storage, sharing, and persistence, making them a fundamental component in many Dockerized applications.

List Volumes:

docker volume ls

Expected Output:

DRIVER    VOLUME NAME
local     myvolume1
local     myvolume2

This command lists all Docker volumes on the host.

2. Inspect a Volume:

docker volume inspect myvolume1

Expected Output:

[    {        "CreatedAt": "2023-11-26T10:00:00Z",        "Driver": "local",        "Labels": {},        "Mountpoint": "/var/lib/docker/volumes/myvolume1/_data",        "Name": "myvolume1",        "Options": {},        "Scope": "local"    }]

This command provides detailed information about a specific Docker volume (myvolume1).

3. Create a Volume:

docker volume create myvolume3

Expected Output:

myvolume3

This command creates a Docker volume named myvolume3.

4. Remove a Volume:

docker volume rm myvolume2

Expected Output:

myvolume2

This command removes a Docker volume named myvolume2.

5. Prune Unused Volumes:

docker volume prune

Expected Output:

WARNING! This will remove all local volumes not used by at least one container.
Are you sure you want to continue? [y/N]
This command removes all unused local volumes.

6. Mount a Volume in a Container:

docker run -d --name mycontainer -v myvolume1:/app myimage:1.0

Expected Output:

1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef

This command runs a container (mycontainer) and mounts the volume (myvolume1) to the /app directory in the container.

7. Mount Multiple Volumes in a Container:

docker run -d --name mycontainer -v myvolume1:/app -v myvolume3:/data myimage:1.0

Expected Output:

1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef

This command runs a container (mycontainer) and mounts multiple volumes (myvolume1 and myvolume3) to different directories in the container.

8. View Mounted Volumes in a Container:

docker exec mycontainer ls /app

Expected Output:

file1.txt
file2.txt

This command executes a command in a running container (mycontainer) to list the contents of the /app directory, which is mounted with the volume.

9. Backup Volume Data:

docker run --rm -v myvolume1:/source -v $(pwd):/backup ubuntu tar cvf /backup/myvolume1_backup.tar /source

Expected Output:

file1.txt
file2.txt

This command creates a backup (myvolume1_backup.tar) of the data in the myvolume1 volume.

10. Restore Volume Data:

docker run --rm -v myvolume1:/target -v $(pwd):/backup ubuntu tar xvf /backup/myvolume1_backup.tar -C /target

Expected Output:

This command restores the data from the backup (myvolume1_backup.tar) to the myvolume1 volume.

These Docker volume commands cover a range of volume-related tasks, from listing and inspecting volumes to creating, removing, and managing data within volumes. Adjust the examples based on your specific use case and volume requirements.