from?https://www.cnblogs.com/caoxb/p/9405323.html
1.下載mysql源安裝包
$ wget?http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
2.安裝mysql源
$?yum localinstall mysql57-community-release-el7-8.noarch.rpm?
3.檢查mysql源是否安裝成功
$?yum repolist enabled | grep "mysql.*-community.*"
4.修改yum源【可跳過(guò)】
$ vim /etc/yum.repos.d/mysql-community.repo
改變默認(rèn)安裝的mysql版本。比如要安裝5.6版本，將5.7源的enabled=1改成enabled=0。然后再將5.6源的enabled=0改成enabled=1即可魔慷。
備注：enabled=1表示即將要安裝的mysql版本抡句，這個(gè)文件也可以不修改愈涩，默認(rèn)安裝mysql最高版本
5.安裝MySQL?
這一步才是真正安裝mysql
$?yum install mysql-community-server
6.啟動(dòng)MySQL服務(wù)并設(shè)置開(kāi)機(jī)啟動(dòng)
$?systemctl start mysqld
$?systemctl enable mysqld
$?systemctl daemon-reload
7.端口開(kāi)放
$ firewall-cmd --zone=public --add-port=3306/tcp --permanent
$?firewall-cmd --reload
8.修改root本地登錄密碼
?1）查看mysql密碼
$?grep 'temporary password' /var/log/mysqld.log
2）連接mysql
$?mysql -uroot -p
3）修改密碼【注意：后面的分號(hào)一定要跟上】
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
或者：
mysql> set password for 'root'@'localhost'=password('MyNewPass4!');?
mysql> show variables like '%password%';
9.添加遠(yuǎn)程登錄用戶
mysql> GRANT ALL PRIVILEGES ON *.* TO 'caoxiaobo'@'%' IDENTIFIED BY 'Caoxiaobo0917!' WITH GRANT OPTION;
10.使用客戶端連接測(cè)試
備注：這里的用戶名是第9步設(shè)置的caoxiaobo笔刹，密碼為：Caoxiaobo0917!
密碼長(zhǎng)度
set global validate_password_length=6;?
?set global validate_password_policy=LOW;
解決 mysql 連接慢問(wèn)題?
http://kouss.com/3907.html
