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Use a separate Unikraft Cloud volume and PostgreSQL instance to rehearse a risky migration without applying it to production. But do not assume that cloning a volume attached to a running database creates a transactionally consistent snapshot: Unikraft’s documentation describes asynchronous volume copies, but does not establish live-PostgreSQL consistency. Confirm the required source state with current platform guidance and validate the copied database before using it.
What volume cloning can—and cannot—guarantee
Unikraft Cloud documents volumes as persistent storage that retains data across restarts and redeployments. Its volume guide describes a clone as an independent copy; clone creation is asynchronous, with the new volume initially shown as pending while data copies in the background. Unikraft’s volume documentation explains this storage lifecycle, but does not say that cloning a volume used by a live PostgreSQL server captures a transactionally consistent point in time.
That distinction matters: an independent storage copy is not, by itself, proof of a database-safe snapshot. The reviewed platform and PostgreSQL guides do not specify whether PostgreSQL must be stopped or quiesced, what checkpoint procedure is required, or whether Unikraft guarantees crash recovery for a clone. Before copying production data, check current Unikraft guidance for source-state requirements. Treat the result as unverified until PostgreSQL starts and the expected data is checked.
Choose the right source operation
Unikraft documents both volume cloning and creating a volume from a template. They are related but distinct operations; do not assume that a template is simply a cloneable volume.
#1 Best Overall
| Approach | What the documentation says | Important constraint |
|---|---|---|
| Clone a volume | Creates an independent copy; creation is asynchronous and the new volume is initially pending. Volume guide | Confirm source eligibility and the database-consistency requirements before copying. The reviewed guide does not certify a live PostgreSQL copy as transactionally consistent. |
| Create a volume from a template | The CLI reference documents kraft cloud volume create --from existing-template --name my-volume. CLI reference |
A volume converted to template state is immutable, cannot be written to, and cannot be deleted while active clones exist. The volume guide says a template itself cannot be cloned; use the documented template-derived volume operation instead. |
The available documentation does not establish that either approach is safer than the other for PostgreSQL consistency or migration rehearsal. Select based on the source’s supported state, the operation Unikraft currently permits, and how the new volume will be attached.
Prepare PostgreSQL to use persistent storage
Unikraft’s PostgreSQL guide demonstrates mounting a volume at /volume and setting PGDATA=/volume/postgres, so the database files reside on persistent storage rather than only in the instance’s transient filesystem. The guide also uses a POSTGRES_PASSWORD environment variable. Follow the current guide for the image and deployment configuration you use; the documented example is not a guarantee that every PostgreSQL image or deployment has identical behavior. PostgreSQL deployment guide
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Migration rehearsal workflow
- Establish persistent storage. Configure the PostgreSQL instance with a mounted Unikraft volume and the documented
PGDATA=/volume/postgrespattern. - Confirm copy eligibility and consistency requirements. Consult current Unikraft instructions for the source volume’s state and whether PostgreSQL must be stopped or otherwise quiesced. The reviewed docs are not enough to claim that a live-database clone is safe.
- Create the separate copy. Use the supported volume-clone operation for the source, or create a volume from a template with the documented
kraft cloud volume create --from existing-template --name my-volumecommand when that is the applicable path. Wait until the asynchronous copy is complete before using the new volume. - Attach it to a separate test instance. Keep the original volume and production instance separate from the rehearsal. Check the current attachment lifecycle before planning the test: warm-plug attachment to a running instance is scheduled to take effect at its next scale-to-zero cycle, and detaching requires the instance to be fully shut down.
- Validate before migrating. Start PostgreSQL against the copied volume, confirm that it starts and that expected data is present, and inspect the database for issues before running the migration. A successful storage copy alone does not validate database consistency.
- Run and assess the rehearsal. Apply the migration only in the test environment, then inspect the results against your team’s acceptance checks. Decide whether to retain or discard the test resources under your normal data-handling policy.
Keep the test volume isolated
Unikraft documents rwo (read-write once) as the default access mode, and lists rox (read-only many) and rwx (read-write many) as alternatives. Its guide says rwx is available only with virtiofs, which it describes as slower than block volumes. Do not mount one ordinary writable PostgreSQL data directory concurrently into production and test database instances: use an independent copy for the rehearsal rather than treating shared read-write access as a substitute for cloning. Volume access modes and filesystems
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Account for PostgreSQL scale-to-zero behavior
The Unikraft PostgreSQL example warns that its default scale-to-zero policy can scale down an instance even when idle psql connections exist. It also describes scale-to-zero support in that example for suspending scale-to-zero while queries run. These are example-specific details, not a general guarantee for every PostgreSQL image or deployment. Check the behavior and settings of the instance used for your rehearsal in the current PostgreSQL guide.
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