centos7安裝mysql數據庫

一、安裝mysql官方yum源

在MySQL官網中下載YUM源rpm安裝包：http://dev.mysql.com/downloads/repo/yum/ 

下載yum源

wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

安裝yum源

yum localinstall mysql57-community-release-el7-8.noarch.rpm

查看mysql相關yum包的名字，如果正常顯示下圖則證明安裝成功

yum repolist enabled | grep "mysql.*-community.*"

如果想修改mysql的默認yum安裝版本可以在yum源文件/etc/yum.repos.d/mysql-community.repo修改enabled值爲1爲生效，爲0則不生效

二、安裝mysql

yum install mysql-community-server

三、啓動mysql

systemctl start mysqld

4、查看mysql狀態

systemctl status mysqld

5、設置開機啓動

systemctl enable mysqld

systemctl daemon-reload

6、查看root默認密碼並修改

查看默認默認密碼

grep 'temporary password' /var/log/mysqld.log

修改密碼

mysql -uroot -p

ALTER USER 'root'@'localhost' IDENTIFIED BY 'MySqlPasswd1!';

或者

set password for 'root'@'localhost'=password('MyNewPass4!');

如果要修改成root123這樣小於八位的簡單密碼則需要修改密碼策略。將策略要求置爲LOW，長度要求置爲6

set global validate_password_policy=0;
set global validate_password_length=6;

然後修改密碼

alter user 'root'@'localhost' identified by 'root123';