- What is and Why volume (data volume)?
- Add a volume
- Mount host directory as a volume
- Create a volume
- Volume container
- Backup, restore, and migrate volumes
What is and Why Volume?
- Containers are ephemeral
- Once a container is removed, it is gone along with data it created
- What about scenarios where you want the applications running inside the container to write to some files/data and then ensure that the data is still present even if the container is no longer runs or exists
- You are running an application that is generating data and it creates files or writes to a database and so on. Now, even if the container is removed and in the future you launch another container, you would like that data to still be there
- Volumes are designed to persist data, independent of the container’s lifecycle
- Docker therefore never automatically deletes volumes when you remove a container, nor will it “garbage collect” volumes that are no longer referenced by a container
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