MySQL · December 20, 2023

How to Fix MySQL Error - The MySQL server is running with the --read-only option so it cannot execute this statement

How to Fix MySQL Error - The MySQL server is running with the --read-only option so it cannot execute this statement

MySQL is a popular open-source relational database management system used by many websites and applications. However, sometimes users may encounter an error message stating, "The MySQL server is running with the --read-only option so it cannot execute this statement." This error occurs when the MySQL server is configured in read-only mode, preventing any modifications to the database.

Causes of the MySQL Error

There are several reasons why the MySQL server may be running in read-only mode:

  • Replication Configuration: If the server is part of a replication setup, it may be configured as a read-only replica to prevent accidental modifications.
  • Incorrect Configuration: The MySQL server configuration file (my.cnf) may have been modified incorrectly, causing the server to start in read-only mode.
  • Filesystem Permissions: Insufficient filesystem permissions on the MySQL data directory can also lead to the read-only error.

Fixing the MySQL Error

Here are some steps you can take to resolve the "The MySQL server is running with the --read-only option so it cannot execute this statement" error:

1. Check Replication Configuration

If your MySQL server is part of a replication setup, verify if it is intended to be a read-only replica. In this case, you cannot make modifications directly on the replica. Instead, you need to connect to the primary server and perform the necessary changes there.

2. Verify Configuration File

Check the MySQL server configuration file (my.cnf) for any incorrect settings that may be causing the read-only mode. Look for the following line:

read-only = 1

If you find this line, remove or comment it out by adding a "#" at the beginning of the line. Save the file and restart the MySQL server for the changes to take effect.

3. Check Filesystem Permissions

Ensure that the MySQL data directory has the correct filesystem permissions. The directory should be owned by the user and group that the MySQL server runs as. You can use the following command to set the correct permissions:

chown -R mysql:mysql /var/lib/mysql

Replace "/var/lib/mysql" with the actual path to your MySQL data directory.

4. Restart MySQL Server

After making any changes, restart the MySQL server to apply the modifications. Use the following command to restart the MySQL service:

sudo service mysql restart

Once the server restarts, check if the error message has been resolved.

Summary

In conclusion, the "The MySQL server is running with the --read-only option so it cannot execute this statement" error can occur due to replication configuration, incorrect server configuration, or filesystem permission issues. By following the steps outlined above, you can fix this error and regain the ability to make modifications to your MySQL database.

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