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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →To keep Docker data after removing a container, store it in a mount rather than only in the container’s writable layer. A Docker volume is usually the simplest choice for Docker-managed persistent data; use a bind mount when the host and container both need a specific path. Neither option is a backup, and the archived CoreOS Container Linux disk-layout guidance applies only to that historical system—not every current CoreOS-family distribution.
Where does Docker container data live?
A container has a writable layer, but files written only there are tied to that container. Docker’s current storage documentation states: “Data written to the container layer doesn’t persist when the container is destroyed.” Removing and replacing a container therefore loses data kept only in that layer.
Docker also stores daemon-managed data such as images and container writable layers on the host. That is distinct from a deliberate data mount: for files that must outlive a particular container, attach a volume or bind mount. A mount changes where the container accesses those files; it does not itself create a backup or copy the data to another host.
Should I use a Docker volume or a bind mount?
Choose based on who needs to manage and access the host files. Docker describes volumes as its preferred mechanism for persisting data generated by and used by containers. Bind mounts are the direct choice when a specific host file or directory must also be visible to processes on the host.
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| Storage choice | Best fit | Main trade-off |
|---|---|---|
| Docker volume | Docker-managed data that should outlive a container and may be mounted by multiple containers. | Docker manages the host location. Directly changing volume data outside Docker is unsupported or undefined behavior in Docker’s documentation. |
| Bind mount | A particular host path needs to be shared with a container. | It depends on host paths and permissions, and host and container processes can modify the same files. |
tmpfs |
Temporary data that should be held in memory rather than persisted. | Ephemeral: it does not persist on the host or in the container filesystem after stop/restart or host reboot. |
| Block device mounted into a volume | A workload needs a separately mounted host device or partition. | Requires host storage setup and workload-specific validation; the reviewed Docker sources do not establish suitability of consumer external drives for production databases. |
See Docker’s documentation for volumes, bind mounts, and storage types.
How do I keep Docker data after removing a container?
Create or use a volume, then mount it at the path where the application reads and writes its data. For example, this runs a container with a named volume mounted at /var/lib/app:
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docker volume create app-data
docker run --mount type=volume,src=app-data,dst=/var/lib/app my-imageThe named volume remains available after the container is removed. To use the same volume with a replacement container, mount it at the same application data path. Docker’s run documentation describes the --mount syntax.
For shared host access, mount a chosen host path instead. This example uses an explicit bind mount:
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docker run --mount type=bind,src=/srv/app-data,dst=/var/lib/app my-imageThe source path is on the Docker host; ensure it exists as needed and that permissions suit the application. With either mount type, take care when mounting over files already present in the container image. In particular, mounting a non-empty volume over a populated container path obscures the underlying files at that path while the mount is in place.
Where are Docker volumes stored?
Docker manages volume storage on the host used by the Docker daemon. The location depends on the daemon’s storage setup; treat the volume as Docker-managed rather than relying on a fixed host path. Docker warns that directly manipulating volume contents outside Docker is unsupported or undefined behavior. A local named volume is not automatically copied or replicated to another machine.
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Docker volumes can be mounted by more than one container, and Docker can prune unused volumes. Before running cleanup commands, confirm that no volume being pruned contains data you still need. For backup and restore, use Docker’s volume guidance and test that the restored data is usable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Will Docker data survive a CoreOS update?
For the system specifically documented in the archived CoreOS Container Linux disk-layout page, the root partition held stateful data—including container images—on a read/write filesystem mounted at /. The document describes a read-only /usr and an update process that did not manipulate data on the ROOT partition. It lists EXT4, BTRFS, and XFS as supported filesystem formats for that layout.
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This is historical guidance for CoreOS Container Linux, not a guarantee for every system now called CoreOS. Fedora CoreOS, RHEL CoreOS, and Flatcar have their own version-specific storage and update behavior; check the documentation for the exact distribution and release before relying on a path or partition surviving an update. For provisioning, Ignition can perform disk-related setup during initramfs, but supported configuration schemas and behavior depend on the target distribution and version.
How do I mount a disk into a Docker container?
A separate disk or partition must first be made available and mounted on the Docker host. You can then expose the host mount point to a container with a bind mount, or configure storage so Docker uses the device-backed location for a volume. The right setup depends on the host operating system and workload; Docker’s storage documentation does not establish that a consumer external drive is suitable for a production database.
- Confirm the target host’s supported disk, filesystem, and mount configuration.
- Choose a stable host mount point and verify ownership and permissions for the container process.
- Mount that host path into the container and validate application behavior, including restart and recovery.
- Keep an independent backup: a mounted disk is still a single storage location unless data is separately backed up or replicated.
Does persistent storage mean the data is backed up?
No. A volume helps data outlive an individual container; it does not protect against host failure, accidental deletion, corruption, or loss of the storage device. Plan separate backups and a recovery procedure, and test restores. Replication is also a separate design choice: a Docker volume on one daemon host does not become shared across hosts automatically.
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