Ubuntu Manpage: mysql_install_db - initialize MySQL data directory

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NAME

       mysql_install_db - initialize MySQL data directory

SYNOPSIS

       mysql_install_db [options]

DESCRIPTION

mysql_install_db initializes the MySQL data directory and creates the system tables that
it contains, if they do not exist. It also initializes the system tablespace and related
data structures needed to manage InnoDB tables. As of MySQL 5.6.8, mysql_install_db is a
Perl script and can be used on any system with Perl installed. Before 5.6.8, it is a shell
script and is available only on Unix platforms.

As of MySQL 5.6.8, on Unix platforms, mysql_install_db creates a default option file named
my.cnf in the base installation directory. This file is created from a template included
in the distribution package named my-default.cnf. You can find the template in or under
the base installation directory. When started using mysqld_safe, the server uses my.cnf
file by default. If my.cnf already exists, mysql_install_db assumes it to be in use and
writes a new file named my-new.cnf instead.

With one exception, the settings in the default option file are commented and have no
effect. The exception is that the file sets the sql_mode system variable to
NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES. This setting produces a server configuration
that results in errors rather than warnings for bad data in operations that modify
transactional tables. See Section 5.1.8, “Server SQL Modes”.

To invoke mysql_install_db, use the following syntax:

shell> mysql_install_db [options]

Because the MySQL server, mysqld, must access the data directory when it runs later, you
should either run mysql_install_db from the same system account that will be used for
running mysqld, or run it as root and specify the --user option to indicate the user name
that mysqld will run as. It might be necessary to specify other options such as --basedir
or --datadir if mysql_install_db does not use the correct locations for the installation
directory or data directory. For example:

shell> scripts/mysql_install_db --user=mysql \
--basedir=/opt/mysql/mysql \
--datadir=/opt/mysql/mysql/data

Note
After mysql_install_db sets up the InnoDB system tablespace, changes to some
tablespace characteristics require setting up a whole new instance. This includes the
file name of the first file in the system tablespace and the number of undo logs. If
you do not want to use the default values, make sure that the settings for the
innodb_data_file_path and innodb_log_file_size configuration parameters are in place
in the MySQL configuration file before running mysql_install_db. Also make sure to
specify as necessary other parameters that affect the creation and location of InnoDB
files, such as innodb_data_home_dir and innodb_log_group_home_dir.

If those options are in your configuration file but that file is not in a location
that MySQL reads by default, specify the file location using the --defaults-extra-file
option when you run mysql_install_db.

Note
If you have set a custom TMPDIR environment variable when performing the installation,
and the specified directory is not accessible, mysql_install_db may fail. If so, unset
TMPDIR or set TMPDIR to point to the system temporary directory (usually /tmp).

mysql_install_db supports the following options, which can be specified on the command
line or in the [mysql_install_db] group of an option file. (Options that are common to
mysqld can also be specified in the [mysqld] group.) Other options are passed to mysqld.
For information about option files used by MySQL programs, see Section 4.2.6, “Using
Option Files”.

• --help

Display a help message and exit.

• --basedir=dir_name

The path to the MySQL installation directory.

• --builddir=dir_name

For use with --srcdir and out-of-source builds. Set this to the location of the
directory where the built files reside.

• --cross-bootstrap

For internal use. This option is used for building system tables on one host intended
for another.

• --datadir=dir_name

The path to the MySQL data directory. Beginning with MySQL 5.6.8, mysql_install_db is
more strict about the option value. Only the last component of the path name is
created if it does not exist; the parent directory must already exist or an error
occurs.

• --defaults-extra-file=file_name

Read this option file after the global option file but (on Unix) before the user
option file. If the file does not exist or is otherwise inaccessible, an error occurs.
file_name is interpreted relative to the current directory if given as a relative path
name rather than a full path name.

• --defaults-file=file_name

Use only the given option file. If the file does not exist or is otherwise
inaccessible, an error occurs. file_name is interpreted relative to the current
directory if given as a relative path name rather than a full path name.

• --force

Cause mysql_install_db to run even if DNS does not work. Grant table entries normally
created using host names will use IP addresses instead.

• --keep-my-cnf

Tell mysql_install_db to preserve any existing my.cnf file and not create a new
default my.cnf file. This option was added in MySQL 5.6.20.

• --ldata=dir_name

A synonym for --datadir.

• --no-defaults

Do not read any option files. If program startup fails due to reading unknown options
from an option file, --no-defaults can be used to prevent them from being read.

• --random-passwords

On Unix platforms, this option provides for more secure MySQL installation. Invoking
mysql_install_db with --random-passwords causes it to perform the following actions in
addition to its normal operation:

• The installation process creates a random password, assigns it to the initial
MySQL root accounts, and sets the “password expired” flag for those accounts.

• The initial random root password is written to the .mysql_secret file in the
directory named by the HOME environment variable. Depending on operating system,
using a command such as sudo may cause the value of HOME to refer to the home
directory of the root system user.

If .mysql_secret already exists, the new password information is appended to it.
Each password entry includes a timestamp so that in the event of multiple install
operations it is possible to determine the password associated with each one.

.mysql_secret is created with mode 600 to be accessible only to the system user
for whom it is created.

• No anonymous-user MySQL accounts are created.

As a result of these actions, it is necessary after installation to start the server,
connect as root using the password written to the .mysql_secret file, and specify a
new root password. Until this is done, root cannot do anything else. This must be done
for each root account you intend to use. To change the password, you can use the SET
PASSWORD statement (for example, with the mysql client). You can also use mysqladmin
or mysql_secure_installation.

New RPM install operations (not upgrades) invoke mysql_install_db with the
--random-passwords option. (Install operations using RPMs for Unbreakable Linux
Network are unaffected because they do not use mysql_install_db.)

As of MySQL 5.6.9, new Solaris PKG install operations (not upgrades) invoke
mysql_install_db with the --random-passwords option.

For install operations using a binary .tar.gz distribution or a source distribution,
you can invoke mysql_install_db with the --random-passwords option manually to make
your MySQL installation more secure. This is recommended, particularly for sites with
sensitive data.

This option was added in MySQL 5.6.8.

• --rpm

For internal use. This option is used during the MySQL installation process for
install operations performed using RPM packages.

• --skip-name-resolve

Use IP addresses rather than host names when creating grant table entries. This option
can be useful if your DNS does not work.

• --srcdir=dir_name

For internal use. This option specifies the directory under which mysql_install_db
looks for support files such as the error message file and the file for populating the
help tables.

• --user=user_name

The system (login) user name to use for running mysqld. Files and directories created
by mysqld will be owned by this user. You must be the system root user to use this
option. By default, mysqld runs using your current login name and files and
directories that it creates will be owned by you.

• --verbose

Verbose mode. Print more information about what the program does.

• --windows

For internal use. This option is used for creating Windows distributions.

COPYRIGHT

       Copyright © 1997, 2017, Oracle and/or its affiliates. All rights reserved.

       This documentation is free software; you can redistribute it and/or modify it only under
       the terms of the GNU General Public License as published by the Free Software Foundation;
       version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY
       WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program;
       if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
       Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

AUTHOR

       Oracle Corporation (http://dev.mysql.com/).

                                                                               MYSQL_INSTALL_DB()

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SYNOPSIS

DESCRIPTION

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