Types Of Mounts in Docker
The data appears the same from within the container in all mount modes. In the filesystem of the container, it is shown as a directory or a single file.
- Volumes: Docker manages volumes kept in a section of the host filesystem (/var/lib/docker/volumes on Linux). This portion of the filesystem shouldn’t be altered by non-Docker processes. In Docker, volumes are the most effective way to store data. Using the docker volume create command, we may directly create a volume, or Docker can do it for us when it creates a container or service.
- Named Pipes: To facilitate communication between a container and the Docker host, a named pipe mount can be employed. Using a named pipe to connect to the Docker Engine API while running a third-party program inside a container is the typical use case.
- Bind Mounts: On the host system, bind mounts can be kept anywhere. These might be crucial system folders or files. They are always modifiable by non-Docker processes running on a Docker host or in a Docker container. Comparatively speaking, bind mounts are less useful than volumes.
- Tmpfs Mounts: These mounts are never written to the host system’s filesystem; instead, they are kept solely in the memory of the host system. Neither on the Docker host nor in a container is it stored on a disc. Sensitive or non-persistent state data can be stored on the tmpfs mount for the duration of the container.
What Is Docker Volume?
Docker containers enable apps to execute in an isolated environment. All modifications made inside the container are lost by default when it ends. Docker volumes and bind mounts can be useful for storing data in between runs. One way to store data outside of containers is with volumes. All volumes are kept in a specific directory on your host, typically /var/lib/docker/volumes for Linux systems, and are controlled by Docker.
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