The statement isTrue. In a Vault cluster, each node must be individually unsealed after initialization or a restart unless auto-unseal is configured. The HashiCorp Vault documentation states: "Since the encryption key is stored in memory, Vault nodes do not share or replicate the encryption key to other nodes. Therefore, each node needs to individually unseal itself upon Vault initialization or anytime the Vault service is restarted on that node." This is due to Vault’s design, where the master key (root key) is held in memory and lost on restart, requiring the unseal process to reconstruct it.
The documentation elaborates: "When a Vault server is started, it starts in a sealed state. In this state, Vault is configured to know where and how to access the physical storage, but doesn’t know how to decrypt any of it. Unsealing is the process of obtaining the plaintext root key necessary to read the decryption key to decrypt the data." Without auto-unseal, this process is manual for each node, making A (True) correct in the default scenario.
[Reference:, HashiCorp Vault Documentation - Seal and Unseal: Unsealing, HashiCorp Vault Documentation - Vault Concepts: Seal, ]
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