Hi,
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I don’t think that’s possible. Vault cluster uses an active/passive approach, at least in the OSS edition.
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Sharing the same data between different clusters is not supported either. I guess this would lead to corruption.
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I don’t know Enterprise edition, but I assume if it’s a POST request, it’s not read-only (https://www.vaultproject.io/api-docs/secret/transit).
Any particular reason you want to do this? Also see my answer here on how Vault clustering works: VAULT_ADDR failover in HA