Enabling Cloud-based Auto Unseal in Vault Open Source

Vault 1.0 has introduced cloud auto unseal in its open source version, allowing users to automatically unlock their data without the need for manual intervention. This feature was previously only available to Enterprise customers and requires migration from manual unseal. Auto unseal uses a trusted device or service to securely store and decrypt the master key, eliminating the complexity of multiple operators providing parts of the shared key. To enable cloud-based auto unseal, users must set up a Key Management System (KMS) on a supported cloud provider and configure Vault accordingly. The migration process involves taking the cluster offline, updating the seal configuration, bringing it back online, and running an unseal process with the `-migrate` flag to complete the transition.

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