Mariadb的root密码忘记后的解决方法
环境背景：CentOS 7.2一、编辑/usr/lib/systemd/system/mariadb.service 文件，在Service段中添加
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Type=simple
User=mysql
Group=mysql
User=mysql
Group=mysql
ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n
# Note: we set --basedir to prevent probes that might trigger SELinux alarms,
# per bug #547485
#在Server段中的ExecStart出添加如下
ExecStart=/usr/bin/mysqld_safe --basedir=/usr --skip-grant-tables --skip-networking
二、键入systemctl daemon-reload使其立即生效
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# systemctl daemon-reload
三、重新启动mariadb服务并使用mysql联入
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# systemctl restart mariadb.service
# mysql
Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.44-MariaDB MariaDB Server
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
四、更改root用户的密码
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MariaDB [(none)]> UPDATE mysql.user SET Password=PASSWORD('xiaoshui') WHERE user='root' and host='localhost';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1Changed: 0Warnings: 0
MariaDB [(none)]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
五、退出并关闭mariadb服务并把/usr/lib/systemd/system/mariadb.service文件中刚刚添加的那两行移除
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ExecStart=/usr/bin/mysqld_safe --basedir=/usr
ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID
六、启动mariadb服务，并使用新设置的密码连接
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# mysql -u root -h localhost -p
Enter password:
Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 5.5.44-MariaDB MariaDB Server
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
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