yum install mariadb mariadb-server #詢問是否要安裝，輸入Y即可自動安裝

[root@127 ~]# systemctl start mariadb.service #啟動MariaDB
[root@127 ~]# systemctl stop mariadb.service #停止MariaDB
[root@127 ~]# systemctl restart mariadb.service #重啟MariaDB
[root@127 ~]# systemctl enable mariadb.service #設(shè)置開機(jī)自動啟動 [root@127 ~]# systemctl disenable mariadb.service #設(shè)置開機(jī)自啟關(guān)閉

[root@127 ~]# mysql_secure_installation #為初始化賬戶root添加密碼
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):這里填寫root密碼，如果是第一次初始化密碼為空直接敲回車（回車前）

Enter current password for root (enter for none):這里填寫root密碼，如果是第一次初始化密碼為空直接敲回車 （回車后↓）
OK, successfully used password, moving on...
Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.
You already have a root password set, so you can safely answer 'n'.
Change the root password? [Y/n] y
New password: 這里填寫新的密碼
Re-enter new password: 這里填寫重復(fù)的密碼
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
... 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
... 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
- Dropping test database...
ERROR 1008 (HY000) at line 1: Can't drop database 'test'; database doesn't exist
... Failed! Not critical, keep moving...
- 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
... 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!# 這里表示修改密碼成功

[root@127 ~]# mysql -uroot -proot 　　　　　　　#　mysql -u這里是填寫的用戶名（默認(rèn)為root） &我是空格& -p這里填寫的是密碼（默認(rèn)為空）

 這表示已經(jīng)進(jìn)入MariaDBWelcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 23
Server version: 5.5.50-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
# 通過/h可以查看很多命令
MariaDB [(none)]> 這里是輸入sql語句的入口