【mariadb用户名及密码】

参考：https://cloud.tencent.com/developer/article/1194378

root

P@ssw0rdmariadb

yum安装官网说明：https://mariadb.com/kb/en/library/yum/

 [root@iZwz99m0qp1swglw9om6zxZ yum.repos.d]# pwd

在/etc/yum.repos.d下建一个MariaDB.repo文件，内容为：

# MariaDB 10.2 CentOS repository list - created 2018-03-10 13:12 UTC

# http://downloads.mariadb.org/mariadb/repositories/

[mariadb]

name = MariaDB

baseurl = https://mirrors.ustc.edu.cn/mariadb/yum/10.2/centos7-amd64

gpgkey= https://mirrors.ustc.edu.cn/mariadb/yum/RPM-GPG-KEY-MariaDB

gpgcheck=1

然后：

yum -y  install mariadb-server mariadb mariadb-client mariadb-devel

启动：

sudo systemctl start mariadb或service mariadb start

设置mariadb root用户密码，默认是空

cd /usr/bin

[root@iZwz99m0qp1swglw9om6zxZ bin]#mysql_secure_installation

然后设置密码，需要选择的地方一路按y

[root@iZwz99m0qp1swglw9om6zxZ bin]# pwd

/usr/bin

[root@iZwz99m0qp1swglw9om6zxZ bin]# mysql -uroot -p

Enter password: 

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 14

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)]>