SchemaHero
A Kubernetes Operator for declarative database schema management — define MySQL table schemas as Kubernetes custom resources and let the operator compute and apply the ALTER TABLE statements needed to reconcile the live schema.
SchemaHero lets you express a table’s schema as a Kubernetes Table custom resource instead of hand-written migration scripts. The in-cluster operator watches those resources, compares the desired schema against the live database, and generates the ALTER TABLE (or CREATE TABLE) statements needed to close the gap — targeting a MySQL instance running inside the cluster or an external one such as a managed RDS database.
Since the 0.9 release, schema changes go through a separate plan-then-apply workflow, so generated SQL can be reviewed before it runs rather than applying automatically. It installs via a kubectl plugin distributed through krew, or as an in-cluster operator for the full declarative workflow. The project is Apache 2.0 licensed and was originally built by Replicated.
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