Archive for the tag 'mySQL'

SBDavid
Jun 1st, 2009

To move mysql to another partition

To move mysql to another partition.

If you have a /var partition, and if that partition is too small it may fill up quickly. If you want to move the data which is stored in “/var” to another partition, run the following:

cd /var
du -h | sort -n

This will give you a full readout of all the directories that are using the most space. The directory using the most disk space will appear at the bottom of the list.

One common culprit is mysql (/var/lib/mysql on Redhat). To move that path to another partition, run the following:

cd /home
mkdir mysql
chown mysql:mysql mysql
cd mysql
/sbin/service mysqld stop
cp -Rp /var/lib/mysql/* .
cd /var/lib
mv mysql mysql_old
ln -s /home/mysql ./mysql
/sbin/service mysqld start

Once satisfied that mysqld is running, remove the old data:

rm -rf mysql_old
SBDavid
Jun 1st, 2009

Error connecting to MySQL: Access denied for user: ‘da_admin@localhost’ (Using password: YES) in DirectAdmin

Error connecting to MySQL: Access denied for user: ‘da_admin@localhost’ (Using password: YES) in DirectAdmin

When connecting to the MySQL screens in DirectAdmin, if this error appears, that would indicated that the “da_admin” user has not been setup correctly. To resolve this do the following.

1) Make sure the root mysql password works. If you know it, skip to 2). The mysql root password can be found in the /usr/local/directadmin/scripts/setup.txt if it has not been deleted. It’s under the header “mysql=”. If it cannot be found, then mysqld will have to be restarted with the –skip-grant-tables option:

service mysqld stop
mysqld_safe –skip-grant-tables &

That should start up mysql without the need for a root password. Once in, type

use mysql
UPDATE user SET password=PASSWORD(’newpass’) WHERE user=’root’;
FLUSH PRIVILEGES;
quit

That will reset the root password for you.

Type “killall -9 mysqld_safe; killall -9 mysqld” to shut down mysqld.
Start it up again with

/sbin/service mysqld start

2) Once the root mysql password is set and known, then you can begin the process of resetting the da_admin mysql user. Type:

mysql -uroot -p

Then press enter. You’ll be asked for the password. Once in mysql, type:

GRANT ALL PRIVILEGES ON *.* TO da_admin@localhost IDENTIFIED BY ‘newdapass’ WITH GRANT OPTION;
FLUSH PRIVILEGES;
quit

That should set the password for da_admin in mysql.

3) Now we need to make sure it’s setup correctly for DA to use. Edit /usr/local/directadmin/conf/mysql.conf and set

user=da_admin
passwd=newdapass

4) Test it out in DirectAdmin.

SBDavid
May 29th, 2009

Repairing MyISAM mySQL Tables and Databases

Repairing MyISAM mySQL Tables and Databases:

Repairing MyISAM mySQL Tables/Databases.
Please note that we assume your mySQL data directory is /var/lib/mysql

cd /var/lib/mysql/DBNAME
myisamchk -r *.MYI

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