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docs/versioned_docs/version-v0.7/guides/v0.7-migration.mdx
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--- | ||
title: Migrating to Keto v0.7 | ||
--- | ||
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||
Ory Keto v0.6 used the table-separated namespaces database schema described in | ||
the [Google Zanzibar paper](https://research.google/pubs/pub48190/). However, we | ||
found for various reasons outlined in | ||
[#613](https://github.com/ory/keto/issues/613) that this is not ideal for Keto. | ||
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Because the database schema changed significantly, and it is not possible to | ||
have SQL-only migrations, there is a special migration procedure needed to | ||
upgrade Ory Keto v0.6. | ||
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## Preparations | ||
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:::danger | ||
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As always with database migrations, please make a backup of your data and try | ||
the migration process first on a non-production copy of the database. | ||
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::: | ||
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This migration has to download all the data from the database, transform them, | ||
and then write them back to the database. Make sure that you run it as close to | ||
the database as possible to reduce the latency and failure rate. In case of a | ||
failure, just restart the process. It is run as one big SQL transaction. | ||
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## Recommended Procedure | ||
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:::caution | ||
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This is the **recommended** procedure. Please adjust to your setup and **test** | ||
before applying to a production system. You might want to create a migration | ||
script that applies all these steps and handles errors. | ||
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::: | ||
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This procedure is zero-downtime only for read API requests. The write API will | ||
not be available during migration. | ||
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1. Create a new database user (from now on `keto_new`) with the same privileges | ||
as the one used until now (let's say it was `keto`). | ||
2. Start a server instance of Keto v0.7 next to the already running Keto v0.6. | ||
It should have the same settings, but use `keto_new` for accessing the | ||
database. | ||
3. Change the privileges of `keto` to be read-only on all tables. | ||
4. Still route all traffic to the old Keto. Write API requests will fail from | ||
now on, but the Read API will be zero-downtime. | ||
5. Run `keto namespace migrate legacy --yes` considering the points raised in | ||
[preparations](#preparations). | ||
6. In case of failure, re-run the command until it succeeds. | ||
7. In case of log statements stating | ||
`Skipping relation tuple, it seems to be in a broken state. Please recreate it manually.` | ||
note down the logged data somewhere and recreate the relation tuples in | ||
question once the migration is done using the API. | ||
8. After the migration is successfully done, route all traffic to Keto v0.7 and | ||
shut down Keto v0.6. At this point the API is fully operational again. |
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