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Description

This error indicates that the MySQL server is currently configured to reject new client connections because it has been intentionally placed in offline mode. This state is typically activated by an administrator or an automated process for maintenance purposes.

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Error Message

The server is currently in offline mode

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Known Causes

3 known causes

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Administrator Offline Command

An authorized administrator explicitly executed a command (e.g., `SET GLOBAL offline_mode = ON`) to transition the MySQL server into a state that rejects new client connections.

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Automated Maintenance Process

A scheduled script, automated tool, or maintenance routine activated the server's offline mode, often in preparation for updates, backups, or other system tasks.

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Persistent Configuration Setting

The MySQL server's configuration file (`my.cnf` or `my.ini`) or a custom startup script is configured to automatically start or operate the server in offline mode.

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Solutions

3 solutions available

1. Restart the MySQL Server easy

A simple restart often resolves temporary offline mode issues.

1

Identify the MySQL service name. This can vary depending on your operating system and installation method.

2

Stop the MySQL service.

sudo systemctl stop mysql

3

Wait for a few seconds to ensure the service has fully stopped.

4

Start the MySQL service.

sudo systemctl start mysql

5

Verify the status of the MySQL service.

sudo systemctl status mysql

2. Check and Modify the `read_only` System Variable medium

The server might be intentionally set to read-only mode.

1

Connect to your MySQL server as a user with sufficient privileges (e.g., root).

mysql -u root -p

2

Check the current value of the `read_only` system variable.

SHOW GLOBAL VARIABLES LIKE 'read_only';

3

If `read_only` is set to `ON` and you intend for the server to be writable, set it to `OFF`.

SET GLOBAL read_only = OFF;

4

To make this change persistent across server restarts, you need to edit the MySQL configuration file (e.g., `my.cnf` or `my.ini`). Locate the `[mysqld]` section and ensure `read_only` is not set or is set to `OFF`.

[mysqld]
# read_only = OFF

5

After modifying the configuration file, restart the MySQL server for the changes to take effect.

sudo systemctl restart mysql

3. Investigate Replication Status (if applicable) medium

Replication slave servers can enter read-only mode automatically.

1

Connect to the MySQL server that is experiencing the error.

mysql -u your_user -p

2

Check the replication status. Look for any errors or warnings that might indicate a problem.

SHOW REPLICA STATUS;

3

If the `Slave_IO_Running` or `Slave_SQL_Running` states are not 'Yes', investigate the underlying replication issues. This might involve checking network connectivity, binlog positions, or error logs.

4

If the server is a replication slave and is intentionally in read-only mode due to replication setup, you might need to temporarily disable the read-only mode to perform specific operations (use with caution).

SET GLOBAL read_only = OFF;

5

After performing necessary operations, consider re-enabling read-only mode if it's part of your intended replication configuration.

SET GLOBAL read_only = ON;

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Related Errors

5 related errors

MySQL Error 3032: Server Offline Mode