By default MariaDB uses the following modes for creating directories and files.

Mode forDefault ModeEnvironment variable
Files0660 (same as -rw-rw----)UMASK
Directories0700 (same as drwx------)UMASK_DIR

By setting the environment variables before you start mysqld or mysqld_safe you can specify the mode for files and directories.

Note that the environment variables are modes specified in octal and OR:de with the default value (as the default value is the minimum value needed for mysqld to work).

In other words, if you would run the following in the shell:

set UMASK=001
export UMASK

mysqld would use the mode 0661 when creating new files.

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