1. Introduction to Docker Volume

What is a Docker Volume?

• A volume is a directory inside a container used for persistent storage.
• It allows data sharing between multiple containers and between a host system and a container.
• Unlike bind mounts, volumes are managed by Docker and stored in Docker’s storage directory (/var/lib/docker/volumes).

Key Features of Docker Volumes

• Volumes exist independent of containers, even if we stop container, still we can access volume.
• Firstly, we have to declare this directory as a volume and then share volume
• Volume will be created in one container.
• You can declare a directory as a volume only while creating container.
• If a container is deleted, its volume remains unless explicitly removed.
• Volumes can be shared between multiple containers.
• Volumes do not get included when updating an image.
• You cannot create a volume from an existing container.
• Two ways to map a volume:
  1. Container ↔ Container
  2. Host ↔ Container

Benefits of Using Docker Volumes

✅ Decouples storage from containers.

✅ Enables data persistence even after container deletion.