1. 修改数据库密码（已知原密码）
进入shell
mysqladmin -uroot -p原密码 password 新密码
root@a038a278a3db:/var/lib/mysql# mysqladmin -u root -proot password 123456
root@a038a278a3db:/var/lib/mysql#
然后就可以直接使用123456这个密码登陆了
mysql -u root -p123456
2. 初始化密码
[root@localhost /]# mysql_secure_installation
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!
In order to log into MariaDB to secure it, we'll need the current
password for the root user. If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.
Enter current password for root (enter for none):
OK, successfully used password, moving on...
Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.
Set root password? [Y/n] y ##输入y
New password: ##输入密码
Re-enter new password: ##输入密码
Password updated successfully!
Reloading privilege tables..
... Success!
By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them. This is intended only for testing, and to make the installation
go a bit smoother. You should remove them before moving into a
production environment.
Remove anonymous users? [Y/n] y ##输入y
... Success!
Normally, root should only be allowed to connect from 'localhost'. This
ensures that someone cannot guess at the root password from the network.
Disallow root login remotely? [Y/n] y ##输入y
... Success!
By default, MariaDB comes with a database named 'test' that anyone can
access. This is also intended only for testing, and should be removed
before moving into a production environment.
Remove test database and access to it? [Y/n] y ##输入y
- Dropping test database...
... Success!
- Removing privileges on test database...
... Success!
Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.
Reload privilege tables now? [Y/n] y ##输入y
... Success!
Cleaning up...
All done! If you've completed all of the above steps, your MariaDB
installation should now be secure.
Thanks for using MariaDB!
进入数据库
[root@localhost /]# mysql -u root -p
Enter password: ##输入密码
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 12
Server version: 5.5.65-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
3. 数据库常规命令
1.启动数据库 [root@localhost jdk1.8]# systemctl start mariadb
2.重启数据库 [root@localhost jdk1.8]# systemctl restart mariadb
3.关闭数据库 [root@localhost jdk1.8]# systemctl stop mariadb
4. 开启远程访问权限
4.1 先查看数据库中的访问权限
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]> select host ,user from user;
+-----------+------+
| host | user |
+-----------+------+
| 127.0.0.1 | root |
| ::1 | root |
| localhost | root |
+-----------+------+
3 rows in set (0.00 sec)
MariaDB [mysql]>
现在root的访问权限仅限在本地访问
4. 2 修改访问权限
MariaDB [mysql]> update user set host="%" where host="localhost";
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
MariaDB [mysql]> select host ,user from user;
+-----------+------+
| host | user |
+-----------+------+
| % | root |
| 127.0.0.1 | root |
| ::1 | root |
+-----------+------+
3 rows in set (0.00 sec)
4.3 刷新权限
MariaDB [mysql]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]>