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Open the application in its Coolify project and environment, go to Configuration > Persistent Storage, choose a mount type, and map storage to the exact path where the container reads and writes data. Save the mount, redeploy, create a test file or record, redeploy again, and confirm it remains. For Docker Compose applications, define the volume or bind mount in the Compose file instead of relying on the standard application form.
Persistent storage protects data from normal container replacement, but it is not a backup and it is local to the deployment server. The correct mount type, destination path, permissions, preview behavior, and backup plan determine whether uploads and application data actually survive.
What persistent storage changes in Coolify
Coolify deploys applications in containers that can be replaced during a redeploy, restart, update, or removal. Files written only to a container’s own writable filesystem are therefore disposable. As the Coolify documentation puts it, “Data written only to a container filesystem can disappear when Coolify redeploys or removes that container.”
A persistent mount connects storage on the deployment server to a path inside the container. Data persists only when the application writes beneath that mounted destination. Mounting a directory at /app/data does not preserve files written to /app/uploads unless the latter is also inside the mounted location or is itself mounted.
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The destination is application-specific. Some images use paths under /app; others use locations such as /var/lib, /usr/src, or a service-specific data directory. Use the image or application documentation, its configuration, or the application’s startup output to identify the real write location. Do not choose /app/uploads merely because it is a common example.
Before adding a mount
- Identify every category of data that must outlive a container: user uploads, generated files, caches that are expensive to rebuild, database files, or configuration files.
- Find the exact container path used for each category. A mount at the wrong path can be completely healthy while the application continues writing ephemeral data elsewhere.
- Decide whether Docker should choose the server-side location or whether you need a known directory on the server.
- For a bind or directory mount, create the host directory before deployment and give the container user the required read and write access.
- Decide whether preview deployments should be isolated from production and whether the data needs an application-aware backup process.
Add persistent storage to a standard Coolify application
- Open the application. In Coolify, open the relevant project, environment, and application.
- Open the storage settings. Select Configuration > Persistent Storage.
- Add a mount. Select Add, then choose Volume Mount, Directory Mount, File Mount, or Host File Mount.
- Enter the source and destination. Supply the managed volume or server location, or the managed file content where applicable. Enter the exact Destination Path inside the container where the application reads and writes.
- Save and deploy. Save the configuration, then redeploy or restart the application so the new container is created with the mount.
- Test persistence. Create a test file, upload, or application record. Redeploy once more and verify that the same data is still present and usable.
A successful deployment alone does not prove persistence. The final redeploy test distinguishes a real mount from data that happened to remain in the current container.
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| Coolify choice | Source location control | What it mounts | Best use | Important requirements |
|---|---|---|---|---|
| Volume Mount | Docker manages the storage location on the deployment server. | A named Docker volume, normally presented as a directory inside the container. | Uploads, generated files, and database data when you do not need a particular host path. | Plan how the volume will be backed up or moved because its location is managed by Docker. |
| Directory Mount | You specify a fixed directory on the deployment server. | A host directory mapped to a container directory; this is a Docker bind mount. | Data that must live at a known server path, such as /srv/my-app/uploads. |
Create the directory first and set permissions for the container user. |
| File Mount | Coolify manages the file content. | One file at a container path. | A configuration, initialization script, policy, or mapping file that Coolify should provide. | The destination must be a file path, not a directory. |
| Host File Mount | You maintain an existing file on the deployment server. | One server file mapped to an exact container file path. | A certificate, configuration, or other file already maintained on the host. | The host file must exist and remain readable by the container process. |
Use a volume mount for Docker-managed application data
A volume mount is the default choice when the application needs a persistent directory but you do not care where Docker stores it on the server. Docker creates and manages a named volume, while the application sees only the destination path in the container. This avoids coupling the deployment to a hand-picked host directory.
Volumes are suitable for changing data such as uploads, generated reports, and database files. They are not automatically portable to another server; the volume remains on the deployment server unless you explicitly back it up and restore or migrate it.
Use a directory mount when the host path matters
A directory mount is appropriate when another process, backup job, administrator, or migration procedure needs a predictable server location. For example, a host directory such as /srv/my-app/uploads can be mapped to the application’s documented upload directory.
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Create the host directory before deploying and set ownership and mode so the user inside the container can read and write it. A directory that is writable by the administrator but not by the container user produces a permission error even when the mount definition is correct. Conversely, granting unnecessarily broad permissions can expose data to unrelated processes.
Use a file mount for one managed file
Choose a file mount when the application needs one file rather than a writable data directory. Examples include a configuration file, startup script, policy file, or static mapping. The destination must name the file that the application opens. Mapping a file mount to a directory path, or mapping a directory mount where the application expects a file, causes startup or read errors.
Use a host file mount for an existing server file
A host file mount exposes a file that already exists on the deployment server. Coolify stores the mount configuration, but you remain responsible for creating, updating, securing, and backing up the source file. Use this option when the server-side file is managed outside Coolify and must appear at an exact path inside the container.
Get the destination path and permissions right
The destination path is the most important field in a persistent-storage configuration. It must be the directory or file path used by the running application, not simply a convenient path that exists in the image. Check the image documentation, application settings, and startup configuration for the write location.
Only content written under the destination path is persistent. If an application stores uploads in /var/lib/example/uploads but the mount is attached to /app/uploads, the upload files remain on the replaceable container filesystem. If the application uses multiple independent directories, add a mount for each one or mount a common parent directory only when that does not hide files the image needs at startup.
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Permissions apply at both layers: the container process must have access to the destination, and the underlying volume or host directory must permit that access. For a directory mount, create the directory, inspect the user and group used by the image, and assign ownership or permissions accordingly. Test an actual write and read as the application, not just as a root shell.
Avoid broad host mappings. Do not mount sensitive or system-wide locations such as /, /etc, /var/lib/docker, or /data/coolify into an application container. A narrow, purpose-built directory limits accidental overwrites and reduces the impact of a compromised application.
Configure persistent storage for Docker Compose applications
For a Docker Compose application or one-click service, the Compose file is the source of truth for volume and bind-mount definitions. Coolify parses that file and displays the resulting mounts, but it does not provide the same editable mount fields used by standard applications.
- Open the Compose resource in its Coolify project and environment.
- Edit the Compose file and add the mount under the specific service that needs the data.
- Use a named volume when Docker should manage the source location:
services:
app:
image: example/app:latest
volumes:
- app-data:/app/data
volumes:
app-data:Replace /app/data with the path documented by the image. The top-level volumes declaration gives the named volume a stable Compose identity.
- Use a bind mount when a fixed server directory is required:
services:
app:
image: example/app:latest
volumes:
- /srv/my-app/uploads:/app/uploadsCreate /srv/my-app/uploads on the deployment server and set permissions before deploying. The right-hand side must be the application’s real write path.
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- Save the Compose file and reload the Compose configuration in Coolify so the parsed service definition includes the new mount.
- Redeploy, create or upload test data, redeploy again, and verify that the service reads the same data.
Editing a visually displayed mount without changing the Compose definition will not make the configuration durable. When troubleshooting a Compose resource, inspect the file first.
Preview deployments and storage isolation
Coolify gives preview deployments separate volume storage by default and adds a -pr-N suffix. Keep that suffix enabled when a preview must be isolated from production. A preview that shares production storage can overwrite user files, apply incompatible schema or format changes, or fill the production volume with test data.
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Server locality, multiple servers, and concurrent access
Persistent storage is local to the deployment server. Connecting another server to the same Coolify installation does not make a Docker volume or local bind mount shared. If an application moves to a different server, its local volume and host directory do not move with it automatically.
Coolify documents restrictions for multi-server applications that use persistent storage. Check the deployment topology before placing a stateful service on a resource that may be scheduled or redeployed elsewhere.
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Do not point two containers at the same writable directory unless the application supports concurrent access and file locking. Many file-based databases and upload processors assume one writer or rely on locking semantics that are not safe when independent containers write simultaneously. Use separate directories for independent environments and services unless shared access is an intentional, supported design.
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Run a persistence test
- Confirm that the destination path exactly matches the application’s documented write directory.
- Write a uniquely named test file, upload a small test object, or create a record through the application itself.
- Read the object back before restarting or redeploying so you know the application can use the path.
- Redeploy the application.
- Check the same path or record after the new container starts.
- Repeat the test after a second deployment if the first redeploy also changed application configuration.
Files disappear after a redeploy
- Verify that the mount is attached to the correct service and destination.
- Check whether the application actually writes to a different directory.
- For Compose, inspect the Compose file rather than relying on the parsed display.
- Confirm that the deployment used the intended project and environment; a mount in one environment does not automatically apply to another.
The application reports permission denied
- Confirm the container user and group used by the image.
- For a directory mount, check ownership and mode on the host directory.
- Test both reading existing files and creating a new file; a directory can be readable but not writable.
- Do not solve an application-specific permission problem by mounting a broad system directory or granting unrestricted access.
The container fails to start after adding a file mount
- Check that the destination is the file path expected by the application.
- Ensure the source content or host file exists and is readable.
- Confirm that a directory was not accidentally mapped over a file, or a file over a directory.
A preview changes production data
- Keep the default preview suffix and separate storage enabled.
- Inspect both the volume name and bind-mount path for a missing or manually removed
-pr-Nisolation suffix. - Use a separate database and upload directory for previews when the application writes mutable data.
The mount works on one server but not another
Check the deployment server first. A local volume or bind source is not replicated merely because both servers are connected to Coolify. Migrate or restore the data on the target server before switching traffic, and verify permissions there.
Two containers corrupt or overwrite files
Stop sharing a writable directory unless the application explicitly supports concurrent writers and file locking. Separate the storage by service or environment, or use the application’s supported shared-storage mechanism instead of a common local directory.
Backups and recovery
“Persistent storage is not a backup.” A mount protects against ordinary container replacement, but it does not protect against accidental deletion, disk failure, server loss, or data corruption.
Coolify can schedule file-level archives for eligible volume and directory mounts and can optionally copy those archives to S3-compatible storage. Configure retention and an off-server destination appropriate to the importance of the data, then test that an archive can actually be restored.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsDatabase files need an application-aware backup workflow. A file-level archive taken while a database is writing may capture an inconsistent state. Use the database engine’s supported dump or backup method, or stop writes and containers when an offline copy is required. Treat the resulting backup as a separate artifact from the persistent mount and test restoration independently.
Moving an application or changing its storage
Because local volumes and bind mounts belong to a deployment server, a server migration requires an explicit data move. Plan the migration around the application’s consistency requirements: stop or quiesce writes when necessary, copy or restore the data to the target storage, recreate the mount at the same container destination, and verify ownership before starting the application.
After the cutover, perform the same write, read, and redeploy test used for a new mount. Keep the original storage until the restored application has been checked and the rollback window has passed.
Quick Recap
A practical storage decision guide
| Need | Preferred choice | Reason |
|---|---|---|
| Persistent uploads without a required host path | Volume Mount | Docker manages the server-side location while the application receives a stable container path. |
| Uploads or generated files at a known server directory | Directory Mount | A fixed path simplifies host-level administration and migration planning. |
| One configuration or startup file managed in Coolify | File Mount | The mount represents a single managed file rather than a writable directory. |
| One existing server file maintained outside Coolify | Host File Mount | The host remains the source of the file while Coolify defines its container destination. |
| Compose or one-click service | Compose volumes definition |
The Compose file controls the resource’s volumes and bind mounts. |
| Preview environments | Separate volume or suffixed bind path | Isolation prevents test deployments from changing production data. |
Operational checklist
- Use the application’s documented write path as the destination.
- Choose a named volume unless a fixed server directory is genuinely required.
- Create bind-mount directories and set container-compatible permissions before deployment.
- Define Compose storage in the Compose file and reload it after editing.
- Keep preview storage isolated with the default suffixing behavior.
- Remember that storage is local to the deployment server.
- Never treat a persistent mount as a backup.
- Test writes, reads, redeploys, and restoration instead of assuming the configuration works.
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