The Tool Desk
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What each Docker option does
Storage mounts and networks solve different problems. A service can use a volume or bind mount for files and one or more networks for communication at the same time.
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| Choice | Where the data or connection lives | Best suited to | Main considerations |
|---|---|---|---|
| Named volume | Storage managed by Docker on the host | Persistent data generated or used by containers, such as application or database state | Lifecycle, backup or migration, sharing between containers, and whether direct host-path access is needed |
| Bind mount | A specific host file or directory mapped into a container | Sharing source code, configuration, or generated files between host and container | Host-path portability, permissions, write access, and which host files the container can reach |
| Compose network | A network connecting selected services | Service discovery and controlling which services can communicate | Whether the default network is enough, which services need to talk, and whether projects need to share a network |
Docker describes volumes as its preferred mechanism for persisting data generated and used by containers. They are managed through Docker rather than tied to one container’s writable layer. Docker’s volume documentation also identifies sharing, backup or migration, and performance-sensitive I/O as volume use cases; these are qualitative recommendations, not a guarantee that every volume will outperform every bind mount.
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When to use a named volume
Choose a named volume when container data should outlive the container and does not need to be an ordinary, directly managed host directory. Removing a container removes its writable layer, but does not by itself remove a volume mounted separately from that layer. Docker can mount one volume into multiple containers, and an unused volume remains available until it is explicitly removed.
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Declare named volumes at the top level of a Compose file, then grant a service access to the volume under that service’s configuration. Compose creates the volume when you run docker compose up if it does not already exist. Docker-managed volumes are generally operated on through Docker tools rather than by relying on their host filesystem path. See Compose service definitions and Docker volumes.
services:
database:
image: postgres
volumes:
- database-data:/var/lib/postgresql/data
volumes:
database-data:The example gives the database a named volume at its data directory. The image and destination path are illustrative; use the data path documented for the image you actually run.
When a bind mount is the better fit
A bind mount maps a chosen host path into a container path. Use one when host and container processes deliberately need access to the same files—for example, editing application source on the host while a development container reads it. It can also expose configuration or write generated files back to the host. Because the container can access the mounted path through normal filesystem operations, choose the source path and write permissions carefully. Docker’s bind-mount guide describes these use cases and the available mount options.
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Prefer read-only access when a container only needs to read host content. A writable mount lets processes in the container change the mounted files, subject to the host’s permissions and platform behavior. Bind-mounting a broad or sensitive host directory can expose more than the application needs.
Check how a missing host path is handled
Mount syntax can change what happens when the source path is misspelled or absent:
- With the Docker Engine CLI,
--mountnormally errors if its source path does not exist. - The CLI’s
-vor--volumesyntax creates a missing host source as a directory. - Compose’s short bind-mount syntax also creates a missing source directory for backward compatibility. With long syntax, set
create_host_path: falseif a missing source should fail instead.
Accidental directory creation can make a mount appear to work while the container sees an empty directory. Check the host path before starting the service. The syntax and service options are documented in Docker’s bind-mount reference and the Compose services reference.
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Account for platform-specific mount options
Docker documents SELinux z and Z labeling options for bind mounts, but relabeling changes how host files are labeled. Do not apply those options casually to broad system directories. Docker also notes that SELinux labeling and ro options are ignored for Compose services in the documented context. Mount behavior can vary by platform and version, so check the current documentation for the Engine and Compose installation you use before relying on a particular option.
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How Docker Compose networks work
Compose creates a default bridge network for a project and connects its services to it by default. Services on the same network can reach each other using service names, such as database, rather than fixed container IP addresses. If Compose replaces a service and its IP changes, the service name remains the discovery name to use. See Docker’s Compose networking guide.
For a basic stack whose services should all communicate, the default project network is often sufficient. Define custom networks when you need a deliberate communication boundary or want selected services—not every service in the project—to share a network. A service can attach to multiple networks, allowing it to connect to another group while remaining separated from services that do not share those networks. Compose network configuration is described in Docker’s networks reference.
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When an internal or external network helps
- Internal network: An internal Compose network has no default gateway for external connectivity. Use it when services on that network should not have the ordinary route to outside networks.
- External network: Use a pre-created external network when separate Compose projects need to connect through a shared network. Attach only the services that need cross-project communication.
Use host networking only when needed
network_mode: host puts a service on the host network stack rather than using ordinary Compose network isolation. Port mapping is unavailable in this mode, and service-name DNS resolution does not work. The container can access host ports and traffic, changing the exposure boundary. Use host mode only when the service genuinely needs that access; see Compose’s service configuration reference.
What happens to data when Compose stops or removes services?
The operation matters as much as the mount type. docker compose down removes a project’s containers and networks by default, but retains named volumes unless you explicitly request their removal. Anonymous volumes are not automatically reused by a later up. For data that must remain available through updates, use an explicit named volume or bind path rather than depending on an anonymous volume being reattached. The exact removal behavior is documented for the docker compose down command.
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Choose mounts and networks with the exposure boundary in mind
A bind mount and a Compose file can grant access to host resources. Docker’s Compose trust guidance warns that configuration can reference files available to the user running Compose. Inspect unfamiliar Compose files before running them, especially their mounts and file-reference fields. Docker’s Compose trust model explains this risk.
For production deployments, Docker suggests removing development bind mounts for application code when that code should remain inside the container and not be changeable from outside. Keep development conveniences separate from production configuration; see Docker’s Compose production guidance.
Quick Recap
A practical choice for a typical application stack
- Put durable application or database state in a named volume. Declare it at the Compose top level and attach it only to the service that needs it.
- Bind-mount host files only when host/container sharing is intentional. Use a narrow source path, choose read-only access where possible, and make sure the path exists or configure Compose to reject a missing one.
- Start with Compose’s default network. Services in the same project can use service names to find one another without fixed IPs.
- Add networks for a concrete isolation or sharing need. Connect only the services that need to communicate across the boundary.
- Review lifecycle commands before running them. Know which volumes a cleanup operation retains or removes, and do not prune data until you have identified what it contains.
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