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Today, I will talk to you about how to understand docker container data volumes, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following for you. I hope you can get something from this article.

What is a docker container data volume? A data volume is data (a file or folder). Data volumes are special directories that can bypass the federated file system and provide access to one or more containers.

The purpose of data volume design is to perpetuate the data, which is completely independent of the life cycle of the container. The data volumes mounted on the container will not be deleted when the container is deleted, and there will be no similar garbage collection mechanism to deal with the data volumes referenced by the container.

In the process of using docker, it is often necessary to persist data or share data among multiple containers, so this involves the data operation of Docker containers. There are two main ways of data management in containers: data volumes and data volume containers.

The data volume exists in the host, independent of the container, and the life cycle of the container is separated, the data volume exists in the file system of the host, and the data volume can be a directory or a file. The container can use the data volume to share data with the host to realize the data sharing and exchange between containers.

Characteristics of container data volumes:

1. The data volume is initialized when the container service starts, and if the image used by the container contains data at the mount point, the data will be copied to the newly initialized data volume.

two。 Data volumes can be shared and reused among containers, and data volumes are a directory in the host that is isolated from the container life cycle.

3. You can modify the contents of the data volume directly, and the modification will take effect immediately, whether it is an operation in the container or a local operation.

4. The update of the data volume does not affect the update of the mirror, the data volume is independent of the federated file system, and the mirror is based on the federated file system. There is no interaction between the mirror and the data volume.

5. The data volume will always exist, even if the container where the data volume is mounted has been deleted.

After reading the above, do you have any further understanding of how to understand docker container data volumes? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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