Volume Commands

List All Volumes

docker volume ls

• Volume names
• Size
• Metadata/details

Create a Named Volume

docker volume create my-volume

• Docker reserves storage space on the host machine
• Docker manages the storage location internally
• We don’t need to worry about OS-specific paths

Default Storage Location

• Windows: Managed internally by Docker
• Mac: Managed internally by Docker

Three Types of Volumes

1. Named Volumes (Most Preferred)

docker run -v my-volume:/data/db mongo

Explanation:

• my-volume → volume name
• /data/db → container path

Key Points:

• Most commonly used in production
• Managed by Docker
• Easy to reuse across containers
• Portable and clean

2. Anonymous Volumes

docker run -v /data/db mongo

Explanation:

• Only container path is given
• No explicit volume name

Key Points:

• Docker automatically generates a random name
• Useful for temporary storage
• Hard to track or reuse
• Mostly used internally or for quick tests

3. Bind Mounts

docker run -v /Users/your-username/Desktop/data:/data/db mongo

Explanation:

• Left side → Host machine path
• Right side → Container path

Key Points:

• Host OS manages the directory
• Direct access to local filesystem
• Useful for development
• Changes are immediately reflected on host

Subtle Difference Between Volume Types

Important Insight

• Bind Mounts → Host OS controls storage location
• Named & Anonymous Volumes → Docker controls storage internally

Remove Unused Volumes

docker volume prune

What This Does

• Removes unused anonymous volumes
• Cleans up storage space
• Does NOT affect named volumes currently in use

Important Note

• Anonymous volumes that are no longer used by any container

Summary

• docker volume ls → list all volumes
• docker volume create → create named volume
• -v my-volume:/path → named volume
• -v /path → anonymous volume
• -v host:path → bind mount
• docker volume prune → clean unused volumes

Key Takeaway

• Named Volumes → Best for production
• Anonymous Volumes → Temporary use
• Bind Mounts → Best for development