如果按照此文章，请下载这个tar包 点击下载 ，里面包含5个文件，然后上传到Linux

使用下面的命令进行解压

tar -xvf MySQL5.7.tar

删除旧版本MySQL的残留信息

rm -rf /usr/lib/mysql
rm -rf /usr/include/mysql
rm -rf /etc/my.cnf
rm -rf /var/lib/mysql
rm -rf /usr/share/mysql

检测是否安装和删除mysql

rpm -qa|grep -i mysql
rpm -e --nodeps mysql-libs

检测是否安装和删除mariadb

rpm -qa|grep mariadb
rpm -e --nodeps mariadb-libs

安装环境

yum install -y perl.x86_64
yum install -y libaio.x86_64
yum install -y net-tools.x86_64

MySQL包的安装

rpm -ivh mysql-community-common-5.7.42-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.42-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.42-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.42-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-compat-5.7.42-1.el7.x86_64.rpm
rpm -ivh mysql-community-*

修改my.cnf文件,添加配置信息

vi /etc/my.cnf

按i进入插入模式，添加下面的代码

[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
[mysqld]
character_set_server=utf8

按Esc退出插入模式，输入:wq 保存退出

创建mysqld.pid存放目录，授予权限

mkdir -p /var/run/mysqld/
chown -R mysql:mysql /var/lib/mysql

启动MySQL服务

systemctl start mysqld&

查看初始密码并登录Mysql（登录Mysql，再输入初始密码）

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

登录Mysql，再输入初始密码

mysql -u root -p

修改默认密码

// 设置新密码的验证策略为0，表示最低
set global validate_password_policy=0;
// 设置新密码的长度最小值为1位
set global validate_password_length=1;
// 设置新密码为123456
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

下面是方便复制粘贴的，上面是解释

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

解决远程登录1130报错

use mysql;
select host from user where user='root';
update user set host = '%' where user ='root';
flush privileges;
select 'host' from user where user='root';
exit;

在centos中设置MySQL开机启动

systemctl enable mysqld.service