failed: Access denied for user 'root'@'localhost' (using password: YES) at /usr/bin/innobackupex lin

[root@t1 /]#   innobackupex --user=root --password /mydata/data /tmp/dir/


InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy
and Percona LLC and/or its affiliates 2009-2013.  All Rights Reserved.


This software is published under
the GNU GENERAL PUBLIC LICENSE Version 2, June 1991.


Get the latest version of Percona XtraBackup, documentation, and help resources:
http://www.percona.com/xb/p


160309 07:09:49  innobackupex: Executing a version check against the server...
160309 07:09:49  innobackupex: Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup' as 'root'  (using password: YES).
innobackupex: got a fatal error with the following stacktrace: at /usr/bin/innobackupex line 3011
main::mysql_connect('abort_on_error', 1) called at /usr/bin/innobackupex line 1551
innobackupex: Error: Failed to connect to MySQL server: DBI connect(';mysql_read_default_group=xtrabackup','root',...) failed: Access denied for user 'root'@'localhost' (using password: YES) at /usr/bin/innobackupex line 2995
160309 07:09:49  innobackupex: Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup' as 'root'  (using password: YES).
innobackupex: got a fatal error with the following stacktrace: at /usr/bin/innobackupex line 3011
main::mysql_connect('abort_on_error', 1) called at /usr/bin/innobackupex line 1570
innobackupex: Error: Failed to connect to MySQL server: DBI connect(';mysql_read_default_group=xtrabackup','root',...) failed: Access denied for user 'root'@'localhost' (using password: YES) at /usr/bin/innobackupex line 2995

[root@t1 /]#  mysqladmin -uroot -p password 'jsb'

Enter password: 
mysqladmin: connect to server at 'localhost' failed

error: 'Access denied for user 'root'@'localhost' (using password: YES)'

解决：

[root@t1 /]# /etc/init.d/mysql stop
-bash: /etc/init.d/mysql: No such file or directory
[root@t1 /]# /etc/init.d/mysqld stop
Shutting down MySQL.... SUCCESS! 
[root@t1 /]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
[1] 12693
[root@t1 /]# 160309 07:11:26 mysqld_safe Logging to '/mydata/data/t1.err'.
160309 07:11:26 mysqld_safe Starting mysqld daemon with databases from /mydata/data


[root@t1 /]# mysql -u root mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A


Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.10-log MySQL Community Server (GPL)


Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.


Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.


Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.


mysql> UPDATE user SET Password=PASSWORD('jsb') where USER='root';
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4  Changed: 4  Warnings: 0


mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)


mysql> quit
Bye

[root@t1 /]# /etc/init.d/mysqld restart

Shutting down MySQL..160309 07:12:49 mysqld_safe mysqld from pid file /mydata/data/t1.pid ended
 SUCCESS! 
Starting MySQL. SUCCESS! 
[1]+  Done                    mysqld_safe --user=mysql --skip-grant-tables --skip-networking
[root@t1 /]# mysql -uroot -pjsb
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.10-log MySQL Community Server (GPL)


Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.


Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.


Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.


mysql> exit
Bye