中班小朋友都会的 CentOS 7 下安装MySQL 5.7！

# 看一下默认的yum源
cd /etc/yum.repos.d/ && ll

# 备份原来的yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

# 下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

# 更新缓存
yum clean all && yum makecache

yum list installed | grep mysql
yum list installed | grep maria

yum -y remove mariadb-libs-5.5.35-3.el7.x86_64

wget dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

yum install mysql-community-release-el7-5.noarch.rpm -y

yum install mysql-community-server -y

#启动之前需要生成临时密码，需要用到证书，可能证书过期，需要进行更新操作
yum update -y
#启动mysql服务
service mysqld start
#设置mysql开机启动
chkconfig mysqld on

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

mysql -uroot -p
#输入密码

set global validate_password_policy=0;
set global validate_password_length=1;
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
flush privileges;

vi /etc/my.cnf

#在[mysqld]部分添加：
character-set-server=utf8
#在文件末尾新增[client]段，并在[client]段添加：
default-character-set=utf8