Migrate database data using ‘backup/restore’
This is a guide for migrating data from modern charms. To migrate legacy charms data, refer to the guide Migrate data via pg_dump.
This Charmed PostgreSQL K8s operator is able to restore its own backups stored on S3-compatible storage. The same restore approach is applicable to restore backups made by a different installation of Charmed PostgreSQL, or even another PostgreSQL charm. (The backups have to be created manually using pgBackRest!)
Warning: The Canonical Data Team describes here the general approach and does NOT support nor guarantee the restoration results.
Always test a migration in a safe environment before performing it in production!
Prerequisites
- Check your application compatibility with Charmed PostgreSQL K8s before migrating production data from legacy charm
- Make sure PostgreSQL versions are identical before the migration
Migrate database data
Below is the general approach to the migration (see warning above!):
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Retrieve root/admin-level credentials from the legacy charm.
See examples here.
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Install pgBackRest inside the old charm OR nearby.
Ensure the version is compatible with pgBackRest in the new
Charmed PostgreSQL K8srevision you are going to deploy! See examples here.Note: You can use
charmed-postgresqlSNAP/ROCK directly. More details here. -
Configure storage for database backup (local or remote, S3-based is recommended).
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Create a first full logical backup during the off-peak
See an example of backup command here.
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Migrate this backup to the Charmed PostgreSQL installation in your test environment.
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Perform all the necessary tests to make sure your application accepted the new database
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Schedule and perform the final production migration, re-using the last steps above.
Do you have questions? Contact us if you are interested in such a data migration!