Mysql 5.5 重置root密码

缺乏、安全感 2024-04-17 23:54 52阅读 0赞

如果忘记了root密码，可以通过下面的流程来重置密码：  
注：需要重启数据库  
  
由于不知道root的密码，不能通过常规的方式来关闭数据库  
  
**通过杀掉进程的方式来强制** **关闭数据库**  
  
\[root@localhost ~\]\# ps -ef|grep mysql  
root     26764 55613  0 Apr04 pts/2    00:00:00 /bin/sh ./mysqld\_safe --defaults-file=/etc/my.cnf  
mysql    27174 26764  0 Apr04 pts/2    00:01:04 /data/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/data --datadir=/var/lib/mysql --plugin-dir=/data/lib/plugin --user=mysql --log-error=/log/err.log --open-files-limit=10240 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306  
root     27192 55613  0 Apr04 pts/2    00:00:00 ./mysql -usystem -px xxxxxxxxx mysql  
root     34544 18985  0 12:11 pts/3    00:00:00 /data/bin/mysql -ufire -px xxxxxxxxx  
root     37683 13290  0 19:32 pts/0    00:00:00 grep mysql  
  
\[root@localhost ~\]\# **kill \`cat /var/run/mysqld/mysqld.pid\`**

**以下面方式** **启动数据库，忽略授权验证和禁止网络客户端连接**

\[root@localhost bin\]\# ./mysqld\_safe --defaults-file=/etc/my.cnf --skip-grant-tables --skip-networking&  
\[1\] 38252  
  
**更改管理员** **用户密码**  
  
\[root@localhost bin\]\# ./mysql  
Welcome to the MySQL monitor.  Commands end with ; or \\g.  
Your MySQL connection id is 2  
Server version: 5.5.48-log production environment  
  
Copyright (c) 2000, 2016, 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> select user();  
\+--------+  
| user() |  
\+--------+  
| root@  |  
\+--------+  
1 row in set (0.00 sec)  
  
mysql> update mysql.user set password=password('System\#2013') where user='system';  
Query OK, 0 rows affected (0.15 sec)  
Rows matched: 1  Changed: 0  Warnings: 0  
  
mysql> commit;  
Query OK, 0 rows affected (0.00 sec)  
  
mysql> flush privileges;  
Query OK, 0 rows affected (0.19 sec)

关闭数据库并重新启动数据库  
  
\[root@localhost bin\]\# ./mysqladmin -usystem shutdown -p  
Enter password:   
160405 19:48:22 mysqld\_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended  
\[1\]+  Done                    ./mysqld\_safe --defaults-file=/etc/my.cnf --skip-grant-tables --skip-networking  
\[root@localhost bin\]\# ./mysqld\_safe --defaults-file=/etc/my.cnf &  
\[1\] 38903  
\[root@localhost bin\]\# 160405 20:07:43 mysqld\_safe Logging to '/log/err.log'.  
160405 20:07:43 mysqld\_safe Starting mysqld daemon with databases from /var/lib/mysql

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