Error
Error Code:
1429
MySQL Error 1429: Foreign Data Source Connection Failure
Description
MySQL Error 1429 indicates that the MySQL server was unable to establish a connection to a specified foreign data source. This typically occurs when attempting to access data via a FEDERATED table or a foreign data wrapper, signifying an issue in reaching or authenticating with the external database.
Error Message
Unable to connect to foreign data source: %s
Known Causes
4 known causesNetwork Connectivity Issues
The MySQL server cannot reach the foreign data source due to network problems, firewall blocks, or incorrect host/port configuration.
Incorrect Connection Parameters
The connection string, host, port, username, or password configured for the foreign data source is invalid or misspelled.
Foreign Data Source Unavailable
The remote database server or data source is not running, is overloaded, or is otherwise unreachable at its end.
Authentication Failure
The credentials (username/password) provided for connecting to the foreign data source are incorrect or lack the necessary permissions.
Solutions
4 solutions available1. Verify Foreign Data Source Connectivity easy
Ensure the MySQL server can reach the foreign data source using standard network tools.
1
From the server where your MySQL instance is running, attempt to connect to the foreign data source using its connection details (hostname, port, etc.). This can be done using tools like `ping`, `telnet`, or a specific client for that data source.
# Example using telnet (replace with actual hostname and port)
telnet <foreign_data_source_host> <foreign_data_source_port>2
If the connection fails, troubleshoot network issues. This might involve checking firewalls on both the MySQL server and the foreign data source server, DNS resolution, or routing problems.
2. Check Foreign Data Source Credentials and Configuration medium
Validate the credentials and connection parameters used for the foreign data source within MySQL.
1
Review the `CREATE SERVER` or `ALTER SERVER` statement used to define the foreign data source in MySQL. Pay close attention to the `HOST`, `PORT`, `USER`, `PASSWORD`, and `DBNAME` (or equivalent) options.
SELECT * FROM information_schema.servers WHERE server_name = '<your_foreign_data_source_name>';2
Manually attempt to connect to the foreign data source using the exact credentials and connection details specified in the MySQL server definition. Use a client tool appropriate for the foreign data source (e.g., `psql` for PostgreSQL, `sqlcmd` for SQL Server).
3
If the manual connection fails, correct the credentials or connection parameters in the MySQL server definition using `ALTER SERVER`.
ALTER SERVER <your_foreign_data_source_name> OPTIONS (host 'new_host', port 1234, username 'new_user', password 'new_password');3. Ensure Foreign Data Wrapper (FDW) Is Installed and Configured Correctly medium
Verify that the necessary Foreign Data Wrapper (FDW) plugin is installed and properly loaded by the MySQL server.
1
Check if the FDW plugin is installed and enabled. The command to do this depends on the specific FDW you are using (e.g., `mysql_fdw`, `oracle_fdw`). You might need to consult the documentation for your FDW.
SHOW PLUGINS;2
If the FDW is not installed or loaded, follow the installation instructions for your specific FDW. This often involves compiling the FDW from source and placing the compiled library in the MySQL plugin directory.
3
Restart the MySQL server after installing or enabling a new plugin.
sudo systemctl restart mysql4
Verify the FDW is loaded by checking `SHOW PLUGINS` again after the restart.
SHOW PLUGINS;4. Examine MySQL Server Error Logs for More Details medium
Investigate the MySQL server's error log for more granular information about the connection failure.
1
Locate your MySQL error log file. The path can usually be found in your `my.cnf` or `my.ini` configuration file under the `log-error` directive.
grep 'log-error' /etc/mysql/my.cnf2
Examine the error log for entries related to Error Code 1429 and the specific foreign data source name around the time the error occurred. These logs might contain more specific error messages from the FDW or the underlying network connection attempt.
tail -f /var/log/mysql/error.log | grep 14293
Based on the additional information in the error log, you can refine your troubleshooting steps. For example, if the log indicates a specific protocol error, you might need to check protocol compatibility or FDW configuration related to it.