Where is my.cnf Located for Homebrew MySQL Installations?

Locating my.cnf for Homebrew MySQL Installations

For installations of MySQL using Homebrew, the default configuration file my.cnf may not exist. This is because Homebrew does not install a default my.cnf. Therefore, MySQL will start with its default settings.

If you wish to create a custom my.cnf to override the defaults, you should place it in the /etc/my.cnf directory. Alternatively, you can access MySQL's help page to view a list of possible configuration locations.

The following command will output the configuration file location:

mysql --help

You will see an output similar to the following:

Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf
The following groups are read: mysql client
The following options may be given as the first argument:
--print-defaults        Print the program argument list and exit.
--no-defaults           Don't read default options from any option file.
--defaults-file=#       Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.

As you can see, there are also various options to bypass the configuration files or specify additional files to be read when invoking MySQL from the command line.

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