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New engineers cannot decrypt the Vault-encrypted group_vars. How did key handling rot, and what is the fix?

Vault's weakness is the single shared password, not the AES256 underneath. The senior answer covers rekey ceremonies on offboarding, encrypt_string for readable diffs, labelled vault-ids per environment, and shrinking what needs encrypting at all.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Vault's weakness is the single shared password, not the AES256 underneath. The senior answer covers rekey ceremonies on offboarding, encrypt_string for readable diffs, labelled vault-ids per environment, and shrinking what needs encrypting at all.

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