Why Does the mysqld\\_safe \"Directory \'/var/run/mysqld\' for UNIX Socket File Does Not Exist\" Error Occur?

Troubleshooting mysqld_safe Directory ' /var/run/mysqld ' for UNIX Socket File Does Not Exist Error

When initializing a MySQL server using mysqld_safe, an error might arise stating that the '/var/run/mysqld' directory for the UNIX socket file is absent. This issue often occurs when starting MySQL server 5.7.17.

Cause of the Error

The error is typically encountered when the '/var/run/mysqld' directory, designated to house the UNIX socket file, is not present during the MySQL server startup process. This can result from manual configuration changes in the MySQL configuration file (my.cfg) or other system modifications.

Solution

To resolve this issue, follow these steps:

• Verify my.cfg: Check the MySQL configuration file (my.cfg) to ensure that the path to the UNIX socket file is correctly specified. If necessary, update the path to the directory '/var/run/mysqld'.
• Create Directory: If the '/var/run/mysqld' directory does not exist, create it manually using the command:

<code class="Bash">mkdir -p /var/run/mysqld</code>

• Set Ownership: Assign ownership of the created directory to the MySQL user:

<code class="Bash">chown mysql:mysql /var/run/mysqld</code>

• Restart MySQL: Restart the MySQL service to apply the changes.

Additional Notes

• Ensure that you have sufficient permissions to create and modify the '/var/run/mysqld' directory.
• If the problem persists, consider checking if the MySQL server is running on a non-standard port or if there are any other configuration issues.

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