1、刪除原有的mariadb

檢視 mariadb

rpm -qa|grep mariadb

刪除mariadb

rpm -e --nodeps mariadb-libs

2、逐個安裝

逐個安裝，命令如下：【必須安裝】

rpm -ivh mysql-community-libs-8.0.16-2.el7.x86_64.rpm
rpm -ivh mysql-community-common-8.0.16-2.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.16-2.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0
 
.16-2.el7.x86_64.rpm

【非必須安裝】
rpm -ivh mysql-community-libs-compat-8.0.16-2.el7.x86_64.rpm
rpm -ivh mysql-community-embedded-compat-8.0.16-2.el7.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.16-2.el7.x86_64.rpm
rpm -ivh mysql-community-test-8.0.16-2.el7.x86_64.rpm

3、缺什麼就安裝什麼

yum install openssl-devel.x86_64 openssl.x86_64 -y
 
yum install perl.x86_64 perl-devel.x86_64 -y
yum install perl-JSON.noarch -y
yum install autoconf -y

4、啟動mysql

systemctl start mysqld

5、檢視臨時密碼

grep "A temporary password" /var/log/mysqld.log

6、修改密碼策略

修改密碼長度：

set global validate_password.length=4;

修改密碼規則：

set global validate_password.policy=LOW;

 
先檢視密碼規則

SHOW VARIABLES LIKE 
 
'validate_password%';