Encrypting your database connection

Metabase stores connection information for the various databases you add in the Metabase application database. To prevent bad actors from being able to access these details if they were to gain access to the application DB, Metabase can automatically encrypt them with AES256 + SHA512 when they are saved, and decrypt them on-the-fly whenever they are needed.

Creating an encryption key

  1. Generate a secret key that is at least 16 characters (longer is even better!). We recommend using a secure random key generator, such as openssl.

    Take care not to lose this key because you can’t decrypt connection details without it. If you lose (or change) the key, you’ll have to reset all of the connection details that have been encrypted with it in the Admin Panel.

  2. Set your secret key as the environment variable MB_ENCRYPTION_SECRET_KEY.

Example commands for creating and adding a key

  1. You can use openssl to generate a cryptographically-secure, randomly-generated 32-character key.
    openssl rand -base64 32
    
  2. Copy the key to your clipboard. It should look something like this:
    IYqrSi5QDthvFWe4/WdAxhnra5DZC3RKx3ZSrOJDKsM=
    
  3. Set the key as an environment variable and start Metabase as usual.
    MB_ENCRYPTION_SECRET_KEY="IYqrSi5QDthvFWe4/WdAxhnra5DZC3RKx3ZSrOJDKsM=" java -jar metabase.jar
    

Once you set the MB_ENCRYPTION_SECRET_KEY value, Metabase will securely encrypt and store the connection details for each new database that you add.

Note

Some versions of Linux interpret single-quotes (') and double-quotes (") differently for environment variable values. If you upgrade to a newer version of Linux, and the key originally used single-quotes, you might need to wrap the key in double-quotes, so that the single-quotes are interpreted literally. For example, MB_ENCRYPTION_SECRET_KEY='IYq...sM=' would become MB_ENCRYPTION_SECRET_KEY="'IYq...sM='"

Encrypting an existing connection

If you added databases before setting the MB_ENCRYPTION_SECRET_KEY value, you can encrypt the connection details by going to each one of those databases in Admin settings > Databases and clicking on the Save button. Existing databases with unencrypted details will continue to work normally.

Rotating an encryption key

  1. We recommend that you backup your data before doing a key rotation.
  2. Stop running your Metabase app.
  3. Run the CLI command rotate-encryption-key.
    • Set the current encryption key as MB_ENCRYPTION_SECRET_KEY.
    • Set the new encryption key as a parameter.

Example command for rotating a key

MB_ENCRYPTION_SECRET_KEY=your-current-key java -jar metabase.jar rotate-encryption-key new-key

Disabling an encryption key

To disable an encryption key, follow the steps to rotate an encryption key, but use an empty string ("") as the new key.

Example command for disabling a key

MB_ENCRYPTION_SECRET_KEY="your-current-key" java -jar metabase.jar rotate-encryption-key ""

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