mysql_secure_installation

what does it do?

asks you set a password for root account
remove root accounts that are accessible from outside the local host.
remove anonymous-user accounts.
remove the test database, which by default can be accessed by anonymous users.

see… it’s important

here’s what happens

me@ubuntop:~$ mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!

In order to log into MySQL to secure it, we’ll need the current
password for the root user. If you’ve just installed MySQL, and
you haven’t set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on…

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

You already have a root password set, so you can safely answer ‘n’.

Change the root password? [Y/n] n
… skipping.

By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them. This is intended only for testing, and to make the installation
go a bit smoother. You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] Y
… Success!

Normally, root should only be allowed to connect from ‘localhost’. This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] y
… Success!

By default, MySQL comes with a database named ‘test’ that anyone can
access. This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y
– Dropping test database…
ERROR 1008 (HY000) at line 1: Can’t drop database ‘test’; database doesn’t exist
… Failed! Not critical, keep moving…
– Removing privileges on test database…
… Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
… Success!

Cleaning up…

All done! If you’ve completed all of the above steps, your MySQL
installation should now be secure.

Thanks for using MySQL!

sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
edit /etc/hostconfig and remove the line MYSQLCOM=-YES-
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*

Create a script to run the reset query
vi /root/mysql.reset.sql

add the reset query:
UPDATE mysql.user SET Password=PASSWORD(‘YOUR-NEW-MYSQL-PASSWORD’) WHERE User=’root’;
FLUSH PRIVILEGES;

execute the script:
# mysqld_safe –init-file=/root/mysql.reset.sql &

Sample output:
nohup: ignoring input and redirecting stderr to stdout
Starting mysqld daemon with databases from /var/lib/mysql
mysqld_safe[20970]: started

# killall mysqld
# /etc/init.d/mysql start

SELECT COLUMN_COMMENT
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'simpl_example' AND TABLE_NAME = 'your_table_name';

mysql -u root -h localhost -p

(enter your password)

then run these commands:

CREATE Database databasename;
CREATE USER ‘username’@’%’ IDENTIFIED BY ‘password’;
REVOKE ALL PRIVILEGES,GRANT OPTION from ‘username’@’%’;
GRANT ALL ON databasename.* TO ‘username’@’%’;

Line 1 creates a database named: databasename (mmmm… insert the database name you want here)
Line 2 creates a user named username and gives them a password
Line 3 Takes a way all username privileges
Line 4 gives username all privileges on all the tables in databasename

SELECT MD5(”m0ntypy7hon”);

This query will return “4f249cbc2c10d41f866b64decd365e39″ which is the encrypted version of the string “ m0ntypy7hon”.

There are other function that crypt stings in MySQL using different algorithms, most notably PASSWORD() which is using MySQL”s own crypting algorithm.

SELECT PASSWORD( “m0ntypy7hon” ) ;

returns: “5216be9f6ead4434”

This statement will replace all occurrences of the string “foo” with the string “bar” in all records of the “ targetfield” column. Apart from the string “bar” the rest of the text contained in the field will be unchanged.

UPDATE `my_table` SET `my_other_field` = (SELECT CASE `my_other_field` WHEN ‘foo’ THEN ‘bar’ ELSE ‘foo’ END) WHERE `my_table_ID_Field` = ‘1’

Here is the test table

CREATE TABLE `my_table` (
  `my_table_ID_Field` int(11) NOT NULL auto_increment,
  `my_field` int(11) NOT NULL,
  `my_other_field` varchar(64) NOT NULL,
  PRIMARY KEY (`my_table_ID_Field`)
);

——Dumping data for table `my_table`—

INSERT INTO `my_table` VALUES(1, 0, ‘foo’);