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  • CentOS7中MariaDB重置密码

    虚拟机里的MariaDB忘记密码了,连接不上,只能重置MariaDB的密码,步骤参考网络

    [root@localhost ~]# mysql -uroot -p
    Enter password: 
    ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
    [root@localhost ~]# mysql -uroot -p
    Enter password: 
    ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
    

    环境

    系统版本

    [root@localhost ~]# cat /etc/redhat-release         # 查看系统版本
    CentOS Linux release 7.4.1708 (Core) 
    

    MariaDB版本

    Server version: 5.5.56-MariaDB MariaDB Server
    

    重置密码的步骤

    1.重启,以安全模式进行MariaDB

    [root@localhost ~]# systemctl status mariadb            # 查看MariaDB数据库状态
    ● mariadb.service - MariaDB database server
       Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)
       Active: active (running) since Thu 2018-07-12 17:42:01 CST; 4min 37s ago
      Process: 1043 ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID (code=exited, status=0/SUCCESS)
      Process: 989 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=0/SUCCESS)
     Main PID: 1042 (mysqld_safe)
       CGroup: /system.slice/mariadb.service
               ├─1042 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
               └─1141 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin ...
    
    Jul 12 17:41:56 localhost.localdomain systemd[1]: Starting MariaDB database server...
    Jul 12 17:41:57 localhost.localdomain mariadb-prepare-db-dir[989]: Database MariaDB is probably initialized in /...ne.
    Jul 12 17:41:57 localhost.localdomain mariadb-prepare-db-dir[989]: If this is not the case, make sure the /var/l...ir.
    Jul 12 17:41:58 localhost.localdomain mysqld_safe[1042]: 180712 17:41:58 mysqld_safe Logging to '/var/lib/mysql...rr'.
    Jul 12 17:41:58 localhost.localdomain mysqld_safe[1042]: 180712 17:41:58 mysqld_safe Starting mysqld daemon wit...ysql
    Jul 12 17:42:01 localhost.localdomain systemd[1]: Started MariaDB database server.
    Hint: Some lines were ellipsized, use -l to show in full.
    
    [root@localhost ~]# systemctl stop mariadb              # 停止MariaDB数据库
    [root@localhost ~]# mysqld_safe --skip-grant-tables		# 安全模式进行MariaDB,并且跳过授权表
    180706 17:51:16 mysqld_safe Logging to '/var/lib/mysql/localhost.localdomain.err'.
    180706 17:51:16 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
    

    2.新建一个ssh连接窗口,进入bash,连接密码库

    [root@localhost ~]# mysql -uroot -p                 # 连接数据库
    Enter password:                                     # 不要输入密码,直接回车
    Welcome to the MariaDB monitor.  Commands end with ; or g.
    Your MariaDB connection id is 1
    Server version: 5.5.56-MariaDB MariaDB Server
    
    Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
    
    Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
    

    3.重置密码,退出MariaDB数据库

    MariaDB [(none)]> 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
    
    Database changed
    MariaDB [mysql]> update user set password=PASSWORD("admin@1234") where user='root';         # 重置数据库密码
    Query OK, 5 rows affected (0.00 sec)
    Rows matched: 5  Changed: 5  Warnings: 0
    
    MariaDB [mysql]> flush privileges;                              # 刷新权限
    Query OK, 0 rows affected (0.02 sec)
    
    MariaDB [mysql]> quit
    Bye
    

    4.重启MariaDB数据库,使用密码进入MariaDB数据库

    [root@localhost ~]# systemctl restart mariadb                   # 重启MariaDB数据库
    [root@localhost ~]# mysql -uroot -p
    Enter password: 
    Welcome to the MariaDB monitor.  Commands end with ; or g.
    Your MariaDB connection id is 7
    Server version: 5.5.56-MariaDB MariaDB Server
    
    Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
    
    Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
    
    MariaDB [(none)]> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    | netperformance     |
    | performance_schema |
    | test               |
    +--------------------+
    15 rows in set (0.01 sec)
    
    MariaDB [(none)]> 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
    
    Database changed
    MariaDB [mysql]> show tables;
    +---------------------------+
    | Tables_in_mysql           |
    +---------------------------+
    | columns_priv              |
    | db                        |
    | event                     |
    | func                      |
    | general_log               |
    | help_category             |
    | help_keyword              |
    | help_relation             |
    | help_topic                |
    | host                      |
    | ndb_binlog_index          |
    | plugin                    |
    | proc                      |
    | procs_priv                |
    | proxies_priv              |
    | servers                   |
    | slow_log                  |
    | tables_priv               |
    | time_zone                 |
    | time_zone_leap_second     |
    | time_zone_name            |
    | time_zone_transition      |
    | time_zone_transition_type |
    | user                      |
    +---------------------------+
    24 rows in set (0.00 sec)
    
    MariaDB [mysql]> select User,Host from user;
    +---------+-----------------------+
    | User    | Host                  |
    +---------+-----------------------+
    | root    | %                     |
    | root    | 127.0.0.1             |
    | root    | ::1                   |
    |         | localhost             |
    | root    | localhost             |
    |         | localhost.localdomain |
    | root    | localhost.localdomain |
    +---------+-----------------------+
    8 rows in set (0.03 sec)
    
    MariaDB [mysql]> exit
    Bye
    

    5.查看MariaDB进程是否正常

    [root@localhost ~]# ps aux | grep mysql                     # 查看MariaDB数据库的进程
    root       6122  0.0  0.1 113260  1592 pts/0    S+   17:51   0:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-tables
    mysql      6206  0.4  9.2 922568 92556 pts/0    Sl+  17:51   0:01 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --skip-grant-tables --log-error=/var/lib/mysql/localhost.localdomain.err --pid-file=localhost.localdomain.pid
    root       6295  0.0  0.0 112660   976 pts/2    R+   17:55   0:00 grep --color=auto mysql
    [root@localhost ~]# ss -tunlp | grep 3306                   # 查看MariaDB数据库的端口
    tcp    LISTEN     0      50        *:3306                  *:*                   users:(("mysqld",pid=1141,fd=14))
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  • 原文地址:https://www.cnblogs.com/renpingsheng/p/9298134.html
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