centos7安装完mariadb设置初始密码

参考：https://www.cnblogs.com/lxg0/articles/5598205.html

1、进到数据库进行操作

[root@localhost etc]# mysql
Welcome to the MariaDB monitor. Commands end with ; or g.
Your MariaDB connection id is 7
Server version: 5.5.41-MariaDB MariaDB Server

Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

MariaDB [(none)]> mysql
-> ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds
to your MariaDB server version for the right syntax to use near 'mysql' at line 1MariaDB [(none)]> update user set password=password("123456")where user='root';
ERROR 1046 (3D000): No database selected

2、选择数据库

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

3、用户root添加密码

MariaDB [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

4、赋予权限

MariaDB [mysql]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

5、退出，重新登录

MariaDB [mysql]> exit
Bye

6、尝试无密码是否可以登录

[root@localhost etc]# mysql

提示错误

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

7、输入密码登陆

[root@localhost etc]# mysql -u root -p123456
Welcome to the MariaDB monitor. Commands end with ; or g.
Your MariaDB connection id is 9
Server version: 5.5.41-MariaDB MariaDB Server

Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

MariaDB [(none)]>

其他写法会报错：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'mysqladmin -u root -p password root' at line 1

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二、允许远程访问

参考：https://www.cnblogs.com/latteyan/articles/5831132.html

GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION; 

如果你想允许用户myuser从ip为192.168.1.3的主机连接到mysql服务器，并使用mypassword作为密码 

GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.3' IDENTIFIED BY 'mypassword' WITH GRANT OPTION; 

 三、启动mariadb

systemctl start mariadb ==> 启动mariadb
systemctl enable mariadb ==> 开机自启动

https://blog.csdn.net/fordarkuse5/article/details/51111281