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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchYou can move an existing ownCloud data directory to another Ubuntu disk without rebuilding the server. The safe sequence is to quiesce ownCloud, copy the directory with rsync, preserve access for Ubuntu’s www-data account, change the absolute datadirectory setting, validate while maintenance mode is still enabled, and only then reopen the service.
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What this procedure applies to
This guide covers a classic, native ownCloud installation on Ubuntu using Apache, such as an installation whose current directory is /var/www/owncloud/data. Replace every example path with the paths used by your server. The procedure is not a drop-in recipe for a Docker deployment: containers have their own filesystem paths, container-side occ commands, mount handling, and, in some versions, database-path steps.
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Prepare the move before touching the server
Confirm the current deployment and path
Find the ownCloud application directory and read the current datadirectory value from config/config.php. A typical native installation has the application in /var/www/owncloud and the data in /var/www/owncloud/data, but your paths may differ. The new value must be an absolute filesystem path, not a path relative to the webroot or the ownCloud application directory.
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Also confirm that Apache is the service serving this installation and that www-data is the Ubuntu HTTP account. Run all occ commands as that account; running them as root can create files that the web process cannot later modify.
Check the destination filesystem
Mount the new disk, NAS share, or NFS export at the final path before the migration. For example, if the target is /mnt/owncloud/data, make sure /mnt/owncloud is a real, persistent mount and not merely an empty directory on the root disk. Confirm that it has enough free space for the complete data tree plus future growth.
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Make the mount persistent in the system’s normal boot configuration and test a reboot or an equivalent unmount/remount procedure before relying on it. Apache and ownCloud must not start against an empty mount point: if the mount is absent, they could see a blank directory and produce confusing errors or write data to the wrong filesystem.
Back up what you will need for a rollback
Take a verified backup of the ownCloud database and copy the ownCloud configuration, including config/config.php. Keep the original data directory intact until the new location has passed administrator testing. A copy-first migration gives you a straightforward fallback; deleting the old directory immediately turns a path mistake into a restoration job.
- Record the old and new absolute paths.
- Record the database backup location and confirm that the backup can be read.
- Check the destination’s available capacity and mount status.
- Schedule a maintenance window long enough to copy the data and inspect logs before users return.
Move the directory step by step
1. Stop web access
Stop Apache so browser requests, WebDAV clients, cron-triggered requests, and background activity cannot change files while they are being copied. The Ubuntu/Debian example in ownCloud’s administration documentation is:
sudo service apache2 stopOn systems managed with systemd, sudo systemctl stop apache2 performs the same service stop. Confirm that Apache is inactive before continuing. Stopping the service prevents new web writes; the maintenance flag below remains important when you start Apache for validation.
2. Enable ownCloud maintenance mode as www-data
Change to the ownCloud application directory and enable maintenance mode with the HTTP account:
cd /var/www/owncloud
sudo -u www-data php occ maintenance:mode --onMaintenance mode prevents new logins and locks existing sessions. Running occ as www-data keeps ownership and permissions consistent with the account that serves ownCloud. If your application directory is different, run the command there so that it uses that installation’s occ file.
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3. Prepare and verify the mounted destination
Check that the mount is present at the path you intend to configure. The destination in this example is the parent directory /mnt/owncloud; the copy command will create /mnt/owncloud/data. Do not accidentally copy into an unmounted directory on the root filesystem.
For a local disk, verify that the mount is writable by the account and that its filesystem is healthy. For NFS, verify the export and its UID/GID mapping first. NFS ownership semantics depend on the server and mount configuration, so blindly running chown while the export is unavailable can change a local placeholder directory rather than the actual data share.
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With Apache stopped and maintenance mode enabled, copy the existing directory while preserving attributes:
sudo rsync -avz /var/www/owncloud/data /mnt/owncloudIn this exact form, rsync creates /mnt/owncloud/data. The source and destination must be checked character by character before you press Enter. A misplaced trailing slash changes whether the directory itself or only its contents are placed at the destination; if you deliberately use a different slash arrangement, verify the resulting tree before changing the configuration.
-a requests archive behavior, preserving the directory structure and attributes that ownCloud needs. -v shows progress, and -z enables compression. Compression is harmless for a local disk and can reduce transfer traffic over some network mounts, although the copy still depends on the performance and reliability of the underlying filesystem.
5. Verify the copy before changing configuration
Do not switch the path merely because rsync returned to the prompt. Check that the new tree contains the expected users, files, and hidden entries, and compare its size with the source while the source is still available. A simple listing and usage check can reveal an incorrect nesting level such as /mnt/owncloud/data/data:
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sudo ls -ld /mnt/owncloud /mnt/owncloud/data
sudo du -sh /var/www/owncloud/data /mnt/owncloud/dataInspect representative subdirectories and files, including names with spaces or unusual characters. For a large tree, run a second rsync in dry-run mode using the same source and destination after the first transfer; any unexpected output deserves investigation before cutover. Keep the old directory untouched until testing is complete.
6. Make ownership and access correct
The data directory must be outside the webroot, exclusive to ownCloud, and writable by Ubuntu’s www-data account. Check the owner and permissions:
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sudo find /mnt/owncloud/data -maxdepth 1 -printf '%M %u:%g %p
'
sudo -u www-data test -r /mnt/owncloud/data && sudo -u www-data test -w /mnt/owncloud/dataThe exact permission mode can vary with the installation, but every directory and file that ownCloud needs must be readable, and locations that receive uploads or generated files must be writable, by the web account. Do not grant unrelated applications or ordinary users write access to the data directory. If a local filesystem has the wrong owner, correct it only after confirming the intended mount:
sudo chown -R www-data:www-data /mnt/owncloud/dataDo not apply that command blindly to an NFS export. If the mount is missing, the command can operate on a local directory beneath the mount point; if the server uses identity mapping, the displayed numeric owner may not be changed in the way you expect. Resolve NFS ownership and permission behavior with the storage administrator before proceeding.
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The traditional method is to edit /var/www/owncloud/config/config.php and change the existing entry to the new absolute path:
'datadirectory' => '/mnt/owncloud/data',Edit the existing setting rather than adding a second key. Preserve the PHP syntax, commas, and quotation marks around the path, and make a backup of the file before saving.
Where supported by your installed ownCloud version, you can use the configuration command instead, from the ownCloud application directory and as www-data:
cd /var/www/owncloud
sudo -u www-data php occ config:system:set datadirectory --value="/mnt/owncloud/data"Use the command syntax documented for your ownCloud release. The important result is one absolute datadirectory value that points to the copied tree.
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8. Start Apache while maintenance mode is still on
Start Apache, but do not disable maintenance mode yet:
sudo service apache2 startOpen the ownCloud URL and confirm that the maintenance page appears cleanly instead of a PHP error, missing-data warning, or permission failure. Inspect the Apache error log and the ownCloud log for path, database, and filesystem errors. This stage proves that the application can start with the new path while users are still blocked from changing data.
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If the page reports that the data directory is not writable or cannot be found, stop Apache again, correct the mount or ownership, and recheck the configured absolute path. Do not delete the original directory to make the error disappear.
9. Disable maintenance mode and test normal operation
Once the new path loads without errors, disable maintenance mode as www-data:
cd /var/www/owncloud
sudo -u www-data php occ maintenance:mode --offLog in as an administrator and test more than the login screen:
- Open several existing files from different user accounts.
- Upload a new file and download it again.
- Rename or delete a test file, then restore it if appropriate.
- Create or inspect a share and confirm that the recipient can access it.
- Check background jobs, previews, and activity generated after the move.
- Review the web-server and ownCloud logs after these actions.
Leave the original data directory in place until these checks succeed and your backup is current. After the retention period you choose, archive or remove the old copy only through a separate, deliberate cleanup operation.
Storage choices: local disk, NAS, or NFS
The destination is not selected by capacity alone. Evaluate growth, mount reliability at boot, backup and snapshot support, ownership semantics, encryption, and the time required to recover. A local filesystem and an NFS export can both work, but their operational risks differ.
| Destination | Checks before migration | Operational concern |
|---|---|---|
| Local disk mounted on the Ubuntu host | Confirm capacity, filesystem health, persistent boot mounting, and www-data read/write access. |
Apache must not start before the disk is mounted, or it may see an empty directory at the configured path. |
| NFS export or NAS-mounted filesystem | Confirm export availability, UID/GID mapping, mount ordering, network access, and backup or snapshot behavior. | Ownership and permissions are controlled partly by the remote server; an unavailable mount can expose a local placeholder directory. |
Keep the data directory dedicated to ownCloud. Sharing the same tree with unrelated applications increases the chance of accidental changes and complicates permissions, backups, and recovery. If encryption is part of your design, document where it is applied and how keys will be restored; the move procedure itself does not create or configure encryption.
Large directories and consistency checks
A multi-terabyte or heavily used data tree can take a long time to copy. The essential consistency rule is that files must not change during the transfer. Stopping Apache and enabling maintenance mode establishes that quiescent state for a native installation. Do not allow users or automated jobs to write directly into the old tree while rsync is running.
If the first transfer is interrupted, rerun the same rsync command after confirming that the source remains unchanged. rsync will compare the trees and transfer what is missing rather than requiring you to discard a complete partial copy. Perform a final verification or dry run before changing config.php.
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Some ownCloud releases and migration guides call for a file scan after a data-directory move, particularly when the deployment method or version changes. Check the documentation for the exact major version installed and run its documented occ file-scan command as www-data if required. Do not paste Docker-specific scan or database instructions into a native Ubuntu installation without confirming that they apply to your deployment and schema.
Rollback if validation fails
The safest rollback is possible because the original directory was copied, not moved. If the new path fails:
- Enable maintenance mode if Apache is running, then stop Apache.
- Restore the original
datadirectoryvalue inconfig/config.php, or use the supportedoccconfiguration command aswww-data. - Confirm that the original data directory is still complete and accessible to
www-data. - Start Apache, keep maintenance mode enabled long enough to verify the old path, and inspect the logs.
- Disable maintenance mode only after the original location works.
If the original tree was damaged or the database and files no longer agree, stop and restore the database and configuration from the backups made before the migration. Do not attempt to repair a failed cutover by deleting either copy or by running unverified SQL updates.
Common failure modes
The configured path exists but ownCloud says it is missing
The mount may not be active, the path may contain a spelling or case error, or the copy may have created an extra directory level. Check the result of findmnt or your system’s mount status, list the exact configured path, and verify that it contains the expected ownCloud data rather than an empty mount point.
Uploads fail after the move
Check write access as www-data on the destination and on every parent directory. On NFS, check remote UID/GID mapping and export permissions instead of repeatedly changing ownership from Ubuntu.
Existing files open, but new files or previews do not
This usually indicates partial write permission, a read-only mount, or a background-job process that cannot reach the new filesystem. Test creation as www-data, inspect the mount’s read/write state, and review both Apache and ownCloud logs.
The server works until reboot
The storage mount is probably not persistent or is being mounted after Apache starts. Correct the boot-time mount configuration and service ordering, then test a reboot before declaring the migration complete.
Users see a database or file-scan warning
Do not assume that a native move requires Docker migration SQL. Confirm the ownCloud major version and deployment type, read that version’s migration guidance, and perform only the file-scan or database steps documented for that combination.
Native Ubuntu versus Docker: do not mix the procedures
Classic installations use the host’s Apache service, host paths such as /var/www/owncloud, and the host’s www-data account. A Docker installation normally exposes a container path backed by a host volume. Its maintenance commands must run inside the appropriate container, and the expected mount point may differ from the host path.
The current ownCloud Classic 11 migration material includes Docker-specific sequencing, remounting or copying into the container’s expected path, file scans, and possible database-path updates. Those instructions are valuable for that deployment, but they are not safe substitutions for the native Apache procedure above. Identify the deployment first, then follow one procedure consistently.
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Document the new path, mount definition, ownership assumptions, backup job, and rollback location. Include the order in which the storage mount, Apache, and ownCloud should start. Keep monitoring enabled for filesystem and application errors during the first backup cycle and after the next reboot. A successful move is not complete until the new storage is mounted reliably, ownCloud can read and write through www-data, users can perform normal file operations, and you have a tested way to restore the database, configuration, and data.
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