Posts Tagged ‘ddr3 ram’

Fixing MySQL server start up “ERROR 1045 (28000): Access denied for user ‘debian-sys-maint’@’localhost’ (using password: YES)”

Friday, September 7th, 2012

I'm still busy configuring the new Lenovo (Le-novo) 🙂 ThinkCenter server necessery for migration of old machines. I've done a lot yesterday but really moving all this stuff takes time …

I moved the SQL databases from the old MySQL server host to the new Debian Linux host.

In order to move databsaes, I did the usual SQL dump from current working host with:

mysql:~# mysqldump --opt --allow-keywords --add-drop-table --all-databases -u root > dump.sql

After that did the standard move of dump.sql to the new host with sftp

mysql-new:~# sftp root@mysql-host
Connected to mysql-host.
sftp> get dump.sql
sftp> exit

and imported dump:

mysql-new:~# mysql -u root -p < dump.sql
Enter password:

Databases dump grow really a lot (7GB)!, so I had to wait for dump.sql to import about 20 minutes – (the host configuration is Dual core 6Ghz 3MB Cache CPU, 4GB DDR3 RAM, 7200 500 GB Hitachi ExcelStor Techno V32O HDD).

The dumps migration was between identical release Debian Linux – (Squeeze 6.0.5) servers running identical versions of MySQL.

mysql-new:~# mysql --version
mysql Ver 14.14 Distrib 5.1.63, for debian-linux-gnu (i486) using readline 6.1

Because of that the whole db import worked like a charm.

Once moved the SQL started re-started normally but there was an on screen warning:

ERROR 1045 (28000): Access denied for user
'debian-sys-maint'@'localhost' (using password: YES)"

The cause of this warning error is because of way /etc/init.d/mysql script is written and in particular the custom MySQL (Debian specific start-up philosophy).

/etc/init.d/mysql is written in a way that on every restart a check of Database consistency is done. There in the script the user debian-sys-maint (a user with mysql administrator root privileges) is used to do the quick consistency check. The debian-sys-maint password which is used on start-up is stored in /etc/mysql/debian.cnf:

mysql-new:~# less /etc/mysql/debian.cnf
# Automatically generated for Debian scripts. DO NOT TOUCH!
host = localhost
user = debian-sys-maint
password = pQFM9RetOHFjewwn
socket = /var/run/mysqld/mysqld.sock
host = localhost
user = debian-sys-maint
password = pQFM9RetOHFjewwn
socket = /var/run/mysqld/mysqld.sock
basedir = /usr

The whole problem is that during, the old SQL import the password set for user debian-sys-maint is different and once SQL starts the init script reads this pass and fails to login to SQL server.

The warning (error):

ERROR 1045 (28000): Access denied for user
'debian-sys-maint'@'localhost' (using password: YES)
hence appears on every SQL start (including on every system boot). The err is generally harmless and SQL seems to work fine with or without it. However since the consistency check is not done at start up, if there are some CORRUPT tables not initiating the start up check is not a good idea.

There are two options to get rid of the warning one and better one is to check in /etc/mysql/debian.cnf for password string and change the pwd with mysql cli e.g.:

new-mysql:~# grep -i pass /etc/mysql/debian.cnf | uniq
password = pQFM9RetOHFjewwn

GRANT SELECT on `mysql`.`user` to 'debian-sys-maint'@'localhost' identified by 'pQFM9RetOHFjewwn';
Query OK, 1 row affected (0.01 sec)
GRANT SELECT ON mysql.user TO 'debian-sys-main'@'localhost';Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

Second option (not recommended in terms of security) is to set user/pass to root values in /etc/mysql/debian.cnf.

That's all. N-joy 🙂