安装MySQL

1）上传MySQL安装包以及MySQL驱动jar包

mysql-5.7.28-1.el7.x86_64.rpm-bundle.tarmysql-connector-java-5.1.37.jar

2）解压MySQL安装包，在/opt/software文件夹下

mkdir mysql_lib
tar -xf mysql-5.7.28-1.el7.x86_64.rpm-bundle.tar -C mysql_lib/

3）卸载系统自带的mariadb

 sudo rpm -qa | grep mariadb | xargs sudo rpm -e --nodeps

4）安装MySQL依赖

 cd mysql_libsudo rpm -ivh mysql-community-common-5.7.28-1.el7.x86_64.rpmsudo rpm -ivh mysql-community-libs-5.7.28-1.el7.x86_64.rpmsudo rpm -ivh mysql-community-libs-compat-5.7.28-1.el7.x86_64.rpm

5）安装mysql-client

 sudo rpm -ivh mysql-community-client-5.7.28-1.el7.x86_64.rpm

6）安装mysql-server

 sudo rpm -ivh mysql-community-server-5.7.28-1.el7.x86_64.rpm

注意：若出现以下错误

warning: 05_mysql-community-server-5.7.16-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

error: Failed dependencies:libaio.so.1()(64bit) is needed by mysql-community-server-5.7.16-1.el7.x86_64

解决办法：

 sudo yum -y install libaio

7）启动MySQL

sudo systemctl start mysqld

8）查看MySQL密码

 sudo cat /var/log/mysqld.log | grep password

设置密码

配置主要是root用户 + 密码，在任何主机上都能登录MySQL数据库。

1）用刚刚查到的密码进入MySQL（如果报错，给密码加单引号）

mysql -uroot -p'password'

2）设置复杂密码（由于MySQL密码策略，此密码必须足够复杂，此处我们通过改变密码策略换成简单密码)

3）更改MySQL密码策略

mysql> set global validate_password_policy=0;mysql> set global validate_password_length=4;

4）设置简单好记的密码

mysql> set password=password("123456");

5）进入MySQL库

mysql> use mysql

6）查询user表

mysql> select user, host from user;

7）修改user表，把Host表内容修改为%

mysql> update user set host="%" where user="root";

8）刷新

mysql> flush privileges;

9）退出

mysql> quit;