1. mysql安装后默认没有密码，初始化安装后默认密码登录，需要马上修改root密码。 [root@mysql ~]# cat /root/.mysql_secret --查看root账号密码 # The random password set for the root user at Tue Dec 13 18:59:06 2016 (local time): 7MhtyX3aZEl9OUf8 [root@mysql ~]# mysql -uroot -p -- 登录mysql Enter password: --（此处复制粘贴 7MhtyX3aZEl9OUf8） Welcome to the MySQL monitor. Commands end with ; or /g. Your MySQL connection id is 2 Server version: 5.6.25 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. 说明： 出现mysql> 表示一切顺利成功。
2. 忘记mysql数据库root的密码后，如何修改密码。 [root@mysql etc]# service mysql stop --停止mysql进程 Shutting down MySQL.... SUCCESS! [root@mysql etc]# mysqld_safe --skip-grant-tables& --启动mysql时不启动grant-tables，授权表。执行后出现下面画面，另起一个新会话。 [1] 3574 [root@mysql etc]# 161215 06:13:53 mysqld_safe Logging to '/var/lib/mysql/mysql.err'. 161215 06:13:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql [root@mysql ~]# ps -ef|grep mysql --查看mysql进程是否起来 root 3467 3440 0 05:29 pts/2 00:00:00 mysql -uandy -px xx root 3574 2845 0 06:13 pts/0 00:00:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-tables mysql 3677 3574 2 06:13 pts/0 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin- mysql> UPDATE user SET password=PASSWORD('cccccc') WHERE user='root'; --更改root密码 Query OK, 4 rows affected (0.04 sec) Rows matched: 4 Changed: 4 Warnings: 0 mysql> FLUSH PRIVILEGES; --权限更新 Query OK, 0 rows affected (0.00 sec) [root@mysql ~]# mysql -uroot -p123456 --使用旧密码登录，发现不行，说明密码已经更新 Warning: Using a password on the command line interface can be insecure. ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) [root@mysql ~]# mysql -uroot -pcccccc --新密码登录成功 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or /g. mysql>
