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MariaDB Environment Variables

MariaDB makes use of numerous environment variables that may be set on your system. Environment variables have the lowest precedence, so any options set on the command line or in an option file will take precedence.

It's usually better not to rely on environment variables, and to rather set the options you need directly, as this makes the system a little more robust and easy to administer.

Here is a list of environment variables used by MariaDB.

Environment Variable Description
CXX Name of the C++ compiler, used for running CMake.
CC Name of the C compiler, used for running CMake.
DBI_USER Perl DBI default username.
DBI_TRACE Perl DBI trace options.
HOME Default directory for the mysql_history file.
MYSQL_DEBUG Debug trace options used when debugging.
MYSQL_GROUP_SUFFIX In addition to the given option groups, also read groups with this suffix.
MYSQL_HISTFILE Path to the mysql_history file, overriding the $HOME/.mysql_history setting.
MYSQL_HOME Path to the directory containing the my.cnf file used by the server.
MYSQL_HOST Default host name used by the mysql command line client.
MYSQL_PS1 Command prompt for use by the mysql command line client.
MYSQL_PWD Default password when connecting to mysqld. It is strongly recommended to use a more secure method of sending the password to the server.
MYSQL_TCP_PORT Default TCP/IP port number.
MYSQL_UNIX_PORT On Unix, default socket file used for localhost connections.
PATH Path to directories that hold executable programs (such as the mysql client, mysqladmin), so that these can be run from any location.
TMPDIR Directory where temporary files are created.
TZ Local time zone.
UMASK Creation mode when creating files. See Specifying Permissions for Schema (Data) Directories and Tables.
UMASK_DIR Creation mode when creating directories. See Specifying Permissions for Schema (Data) Directories and Tables.
USER On Windows, up to MariaDB 5.5, the default user name when connecting to the mysqld server. API GetUserName() is used in later versions.
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https://mariadb.com/kb/en/mariadb-environment-variables/