问题描述：
登录数据库，无法登录
[root@proxy02 mysql]# ./bin/mysql -uroot -proot -S /data/soft/mysql/tmp/mysql.sock
Warning: Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
解决思路：
1、关闭数据库
[root@proxy02 mysql]# ps -ef |grep mysql
root 25670 1 0 06:40 ? 00:00:00 /bin/sh /data/soft/mysql/bin/mysqld_safe --defaults-file=/data/soft/mysql/my.cnf
mysql 25932 25670 0 06:40 ? 00:00:00 /data/soft/mysql/bin/mysqld --defaults-file=/data/soft/mysql/my.cnf --basedir=/data/soft/mysql --datadir=/data/soft/mysql/data --plugin-dir=/data/soft/mysql/lib/plugin --user=mysql --log-error=/data/soft/mysql/log/mysqld.log --pid-file=/data/soft/mysql/data/proxy02.pid --socket=/data/soft/mysql/tmp/mysql.sock --port=3306
root 26169 24888 0 07:38 pts/0 00:00:00 grep mysql
[root@proxy02 mysql]# kill -9 25670
[root@proxy02 mysql]# kill -9 25932
2、安全模式启动数据库
[root@proxy02 mysql]# ./bin/mysqld_safe --defaults-file=/data/soft/mysql/my.cnf --skip-grant-tables
181011 07:44:13 mysqld_safe Logging to '/data/soft/mysql/log/mysqld.log'.
181011 07:44:13 mysqld_safe Starting mysqld daemon with databases from /data/soft/mysql/data
3、连接数据库更改密码
[root@proxy02 mysql]# ./bin/mysql -S /data/soft/mysql/tmp/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.23-log Source distribution
Copyright (c) 2000, 2015, 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> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
mysql> update user set password=password('123456') where user='root';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 4 Changed: 0 Warnings: 0