centos yum安装mysql5.7 或 mysql8.0

参考：http://www.koukousky.com/back/1296.html
参考:https://dev.mysql.com/doc/mysql-yum-repo-quick-guide/en/

$ wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

$ rpm -Uvh mysql80-community-release-el7-3.noarch.rpm  --force --nodeps

#设置mysql版本为5.7

$ vim /etc/yum.repos.d/mysql-community.repo 
[mysql56-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1 #指定版本
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

$ yum install mysql mysql-server mysql-devel mysql-bench mysql-common mysql-devel mysql-libs

#启动
$ systemctl start mysqld.service

#开机启动
$ systemctl enable mysqld.service

#查看默认创建的root密码
#$ grep 'temporary password' /var/log/mysqld.log

$ mysql -uroot -p

#修改roomt密码,MySQL的 validate_password 插件默认安装。这将要求密码包含至少一个大写字母，一个小写字母，一个数字和一个特殊字符，并且密码总长度至少为8个字符。

##5.7
$ SET PASSWORD = PASSWORD('your_new_password');
##5.6
$ UPDATE mysql.user SET Password=PASSWORD('xxxxxx') WHERE User='root'; 

$ flush privileges;