EC
3217
MySQLERRORCommonInnoDB / EncryptionHIGH confidence

Cannot find encryption key in keyring

Production Risk

Critical — encrypted data becomes inaccessible.

Why it happens
  1. 1The encryption key referenced by an InnoDB tablespace cannot be found in the keyring.
  2. 2Keyring file was replaced, deleted, or keyring plugin was changed after encryption.
How to reproduce
trigger — this will error
trigger — this will error
SELECT * FROM encrypted_table;

expected output

ERROR 3217 (HY000): Cannot find key in keyring, please check keyring plugin is loaded.

Fix 1

Restore the keyring file from backup

Restore the keyring file from backup
-- Restore the keyring file to its original location and restart MySQL.

Why this works

The original keyring file contains the key needed to decrypt the tablespace.

Fix 2

Verify keyring plugin is active

Verify keyring plugin is active
SELECT PLUGIN_NAME, PLUGIN_STATUS FROM information_schema.PLUGINS WHERE PLUGIN_NAME LIKE 'keyring%';

Why this works

Confirm keyring plugin is installed and ACTIVE.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 3217 ER_CANNOT_FIND_KEY_IN_KEYRING

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