ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

The error ER_NOT_SUPPORTED_AUTH_MODE indicates that the MySQL client library being used by TypeORM does not support the authentication method required by your MySQL server. This often happens when your MySQL server is configured with a newer authentication method (caching_sha2_password), which is not supported by older versions of MySQL client libraries.

To resolve this issue when deploying a Midway + TypeORM application to a cloud server, follow these steps:

1. Update TypeORM and MySQL Client Library

Ensure that you are using the latest versions of TypeORM and the MySQL client library (mysql2), as newer versions typically support modern authentication methods.

Update TypeORM

npm install typeorm@latest

Update MySQL Client Library (`mysql2`)

npm install mysql2@latest

2. Configure TypeORM Connection

Ensure that your TypeORM connection configuration (ormconfig.json or through TypeScript configuration) is correctly set up to use mysql2 and specifies the correct authentication method.

Example `ormconfig.json` with `mysql2`

{
  "type": "mysql",
  "host": "your_mysql_host",
  "port": 3306,
  "username": "your_mysql_username",
  "password": "your_mysql_password",
  "database": "your_database_name",
  "entities": ["dist/**/*.entity{.ts,.js}"],
  "synchronize": true,
  "logging": true
}

3. Modify MySQL Server Authentication Method

If updating TypeORM and mysql2 doesn't resolve the issue, you can modify the authentication method used by your MySQL server to one that is compatible with your current MySQL client library (mysql2). The most compatible method across all versions is mysql_native_password.

Change MySQL User Authentication Method

ALTER USER 'your_mysql_username'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_mysql_password';

Replace 'your_mysql_username', 'localhost', 'your_mysql_password' with your actual MySQL username, host, and password.

4. Restart MySQL Server

After making changes to the MySQL server configuration, restart the MySQL server to apply the changes.

5. Verify and Test

Test your Midway + TypeORM application deployment after making these changes to ensure that the ER_NOT_SUPPORTED_AUTH_MODE error is resolved and that your application can connect to the MySQL database without issues.

Additional Tips

Environment Variables: Use environment variables to securely manage sensitive information such as database credentials.
Debugging: If issues persist, enable logging in TypeORM ("logging": true in ormconfig.json) to get more insights into the database connection process and any errors encountered.

By following these steps, you should be able to resolve the authentication method mismatch issue (ER_NOT_SUPPORTED_AUTH_MODE) and successfully deploy your Midway + TypeORM application to your cloud server environment.

ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requ