1、关闭防火墙
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动

查看防火墙状态
systemctl status firewalld.service

启动防火墙
systemctl start firewalld.service

2、修改主机名
第一种
hostnamectl set-hostname base
第二种
vim /etc/hostname
查看主机名
hostnamectl status

3、修改ip地址

vim /etc/sysconfig/network-scripts/ifcfg-ens33

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=ens33
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.129.211
NETMASK=255.255.255.0
GATEWAY=192.168.129.2
DNS1=192.168.129.2

4、安装mysql5.7
下载yum Repository
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
安装yum Repository
yum -y install mysql57-community-release-el7-10.noarch.rpm

安装mysql5.7
yum -y install mysql-community-server
开机自启动
systemctl enable mysqld.service
启动mysql
systemctl start mysqld.service
查看状态
systemctl status mysqld.service

获取临时密码
grep "password" /var/log/mysqld.log

登录mysql
mysql -uroot -p

关闭密码复杂验证
set global validate_password_policy=0;
set global validate_password_length=1;

设置密码
alter user user() identified by "123456";

修改权限
use mysql;
GRANT ALL PRIVILEGES ON . TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION; --修改权限
flush privileges; --刷新权限
select host,user,authentication_string from user; --查看权限

卸载yum Repository
因为安装了Yum Repository，以后每次yum操作都会自动更新，需要把这个卸载掉：
yum -y remove mysql57-community-release-el7-10.noarch

4、卸载mysql
删除依赖包
rpm -qa |grep -i mysql
yum remove mysql-community mysql-community-server mysql-community-libs mysql-community-common

清理文件
find / -name mysql
rm -rf 文件名