mysqladmin -u root password 123456

mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'

mysql -u root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

mysql       mysql_conf
[root@localhost lukasz]# cat mysql
# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#

# The following options will be passed to all MySQL clients
[client]
user            = root
#password       = your_password
port            = 3306
socket          = /var/lib/mysql/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
user            = mysql
datadir         = /var/lib/mysql
port            = 3306
socket          = /var/lib/mysql/mysql.sock
pid-file        = /var/run/mysqld/mysqld.pid
skip-locking
key_buffer = 16M
max_allowed_packet = 1M
table_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
collation_server = utf8_unicode_ci
character_set_server = utf8

# Default to using old password format for compatibility with old and
# shorter password hash.
# Reference: http://dev.mysql.com/doc/mysql/en/Password_hashing.html
old_passwords

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
skip-networking

# Replication Master Server (default)
# binary logging is required for replication
#log-bin=mysql-bin

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id       = 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password>;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Point the following paths to different dedicated disks
#tmpdir         = /tmp/
#log-update     = /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#bdb_cache_size = 4M
#bdb_max_lock = 10000

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql/
#innodb_log_arch_dir = /var/lib/mysql/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

#bind-address=192.168.100.1

## Options for mysqld process:
#ndbcluster                      # run NDB engine
#ndb-connectstring=192.168.0.10  # location of MGM node

## Options for ndbd process:
#[mysql_cluster]
#ndb-connectstring=192.168.0.10  # location of MGM node

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
default-character-set = utf8

[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysql.server]
user=mysql
basedir=/var/lib

[mysqld_safe]
err-log=/var/log/mysqld/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

# MySQL Instance Manager options section
[manager]
user=mysql
default-mysqld-path=/usr/sbin/mysqld
socket=/var/lib/mysql/mysqlmanager.sock
pid-file=/var/run/mysqld/mysqlmanager.pid
password-file=/etc/mysqlmanager.passwd
run-as-service
monitoring-interval=20
port=2273
#bind-address=192.168.100.1

mysql -u root -p

user            = root
#password       = your_password

   user                 = root
    password        =123456

mysql -u root -p

123456

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

mysql> update user set password=PASSWORD(”newrootpassword”) where user=’root’;
ERROR 1054 (42S22): Unknown column '’root’' in 'where clause'

mysql> update user set password=PASSWORD(”newrootpassword”) WHERE User=’root’;
ERROR 1054 (42S22): Unknown column '’root’' in 'where clause

mysql> update user set password=PASSWORD('123456') WHERE User='root';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 0  Changed: 0  Warnings: 0

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