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Lost MySQL root password
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riteman
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Joined: 01 Feb 2011
Posts: 27

PostPosted: Mon Feb 21, 2011 2:10 am    Post subject: Lost MySQL root password Reply with quote

Hi
as I set up a password for root it seems I made a mistake - at least I was unable to log into MySQL afterwards.
I have tried to restore the password by using the standard steps:

service mysql stop

wait until MySQL shuts down. Then run

mysqld_safe --skip-grant-tables &

then you will be able to login as root with no password.

mysql -uroot mysql

In MySQL command line prompt issue the following command:

UPDATE user SET password=PASSWORD("abcd") WHERE user="root";
FLUSH PRIVILEGES;

At this time your root password is reset to "abcd" and MySQL will now
know the privileges and you'll be able to login with your new password:

mysql -uroot -pabcd mysql

but when I start the Server in step 2 it stops almost immediately.

Any hints what is wrong? I have also stopped Mysql using the Mysql.PID
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gerasimos_h
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Joined: 09 Aug 2007
Posts: 1753
Location: Greece

PostPosted: Mon Feb 21, 2011 6:58 am    Post subject: Reply with quote

If it's a password issue just stop mysql and do
Code:
echo "set password for root@localhost=password('toor');" > db.txt
mysqld_safe --init-file=db.txt
rm -rf db.txt
mysql -u root -p

If it's not a password issue, what /var/lib/mysql/sms.err says?

gerasimos_h

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riteman
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Joined: 01 Feb 2011
Posts: 27

PostPosted: Mon Feb 21, 2011 10:59 am    Post subject: Reply with quote

My problem is that I cannot start Mysql as you indicate as it shuts down almost immediately but the sms.err has a statement which may tell you something:

Unknown collation: 'utf8'

before Mysql is shut down after I try to start it in Safe mode.
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gerasimos_h
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Joined: 09 Aug 2007
Posts: 1753
Location: Greece

PostPosted: Mon Feb 21, 2011 11:04 am    Post subject: Reply with quote

edit /etc/my.cnf

collation-server=utf8
to
collation-server=utf8_general_ci

gerasimos_h

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riteman
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Joined: 01 Feb 2011
Posts: 27

PostPosted: Mon Feb 21, 2011 12:38 pm    Post subject: Reply with quote

I tried and when entering the last statement I am asked for the password and enter "toor" - the answer is:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysql/mysql.sock' (111)
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gerasimos_h
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Joined: 09 Aug 2007
Posts: 1753
Location: Greece

PostPosted: Mon Feb 21, 2011 12:51 pm    Post subject: Reply with quote

Stop mysql and verify it with
"ps aux|grep mysql"
You should see only your grep state.
Repeat procedure
Code:
echo "set password for root@localhost=password('toor');" > db.txt
mysqld_safe --init-file=db.txt
mysql -u root -p


Have you changed maybe the host or database permissions from webmin?

If not kill mysql , verify and run
mysqld_safe --skip-grant-tables &
and try changing the password from webmin..

gerasimos_h

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riteman
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Joined: 01 Feb 2011
Posts: 27

PostPosted: Sat Feb 26, 2011 6:19 pm    Post subject: Reply with quote

I killed Mysql by using the PID file:

kill `cat mysql.pid`

Then I created a file called mysql-init with the following content


UPDATE mysql.user SET Password=PASSWORD('MyNewPassword') WHERE User='root';
FLUSH PRIVILEGES;

and placed it in /var/run/mysql

As you see in the screenshot Mysql shuts down immediately and I found the following error in sms.err:

110226 12:43:04 [ERROR] /usr/libexec/mysqld: File 'mysql-init' not found (Errcode: 2)

so it seems Mysql is looking for the file in that folder. Unfortunately there is a large file in /usr/libexec named mysqld so I cannot create a folder with that name.
I then started Mysql by pointing directly to the file and now sms.err says

110226 17:01:28 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
110226 17:01:28 InnoDB: Initializing buffer pool, size = 8.0M
110226 17:01:28 InnoDB: Completed initialization of buffer pool
110226 17:01:28 InnoDB: Started; log sequence number 0 21161275
110226 17:01:28 [Note] Event Scheduler: Loaded 0 events
110226 17:01:28 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.54-log' socket: '/var/run/mysql/mysql.sock' port: 3306 Source distribution

Putty then ends with the cursor on an empty line as if it waits for a command so I sent an "Enter" and Putty then showed the normal prompt.
Going to Webadmin I can now open the Mysql server info page Smile .

BUT I seem to have another problem: sms.err is 17 MB and contains lots of WARNINGS

110225 7:58:59 [Warning] Statement may not be safe to log in statement format. Statement: UPDATE `operators` SET `first_active`='1298617122',`password`='671bd9e030ea198431baf7b3ed15157d',`login_id`='00-30-1B-B7-1A-CE1',`visitor_file_sizes`='a:1:{s:10:\"356aec1650\";a:1:{s:10:\"79cc16bc6c\";N;}}',`typing`='0',`level`='0',`status`='0',`ip`='192.168.0.100',`last_active`='1298617139',`last_chat_allocation`=0 WHERE `id`='911cbb6' LIMIT 1

Any idea what causes this?



Mysql error.jpg
 Description:
Output from Putty
 Filesize:  37.56 KB
 Viewed:  25109 Time(s)

Mysql error.jpg


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gerasimos_h
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Joined: 09 Aug 2007
Posts: 1753
Location: Greece

PostPosted: Sat Feb 26, 2011 7:21 pm    Post subject: Reply with quote

From "man mysqld"
Code:
  --init-file=file_name

          Read SQL statements from this file at startup. Each statement must
          be on a single line and should not include comments.

So error was correct, you should have run
mysqld_safe --init-file=/var/run/mysql/mysql-init

If you set your mysql root password stop mysql and start it with /etc/rc.d/rc.mysqld script, so it reads /etc/my.cnf and start with binary-logging

http://dev.mysql.com/doc/refman/5.1/en/binary-log-formats.html

gerasimos_h

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