centos7.9下安装mysql8

在mysql官网下载mysql-8.0.28-1.el7.x86_64.rpm-bundle.tar
查看是否已经安装了mysql rpm -qa |grep mysql

rpm -qa | grep mysql

查看是否已经安装了mariadb

rpm -qa | grep mariadb

[root@bogon software]# rpm -qa | grep mariadb

mariadb-libs-5.5.68-1.el7.x86_64

卸载mariadb

rpm -e --nodeps mariadb-libs

按顺序安装mysql

rpm -ivh mysql-community-common-8.0.28-1.el7.x86_64.rpm 安装通用包
rpm -ivh mysql-community-client-plugins-8.0.28-1.el7.x86_64.rpm 安装客户端插件
rpm -ivh mysql-community-libs-8.0.28-1.el7.x86_64.rpm 安装依赖lib包
rpm -ivh mysql-community-client-8.0.28-1.el7.x86_64.rpm 安装客户端
rpm -ivh mysql-community-icu-data-files-8.0.28-1.el7.x86_64.rpm 安装icu-data
rpm -ivh mysql-community-server-8.0.28-1.el7.x86_64.rpm 安装服务端，但是报错误没需要安装net-tools
警告：mysql-community-server-8.0.28-1.el7.x86_64.rpm: 头V4 RSA/SHA256 Signature, 密钥 ID 3a79bd29: NOKEY

错误：依赖检测失败：

net-tools 被 mysql-community-server-8.0.28-1.el7.x86_64 需要

yum install net-tools
再次安装server

rpm -ivh mysql-community-server-8.0.28-1.el7.x86_64.rpm

初始化mysql

mysqld --initialize --console

改变权限

chown -R mysql:mysql /var/lib/mysql/

启动mysql

systemctl start mysqld

查看mysql初始化时候的密码

cat /var/log/mysqld.log

cat /var/log/mysqld.log |grep localhost

登录mysql

Mysql -uroot -p

修改密码

alter user 'root'@'localhost' IDENTIFIED BY '

修改root密码
alter user 'root'@'localhost' IDENTIFIED BY 'roottest001';
flush privileges;
8）重新登陆
9）ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'roottest001';（修改root密码）
10）创建数据库，带编码格式；
create database mydb1 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

create database xiaozhu DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

11）创建用户
create user 'test'@'192.168.%' identified by 'test002' PASSWORD EXPIRE NEVER;
ALTER USER 'test'@'192.168.%' IDENTIFIED WITH mysql_native_password BY 'test002';

GRANT ALL ON test.* TO 'mydb1'@'192.168.%';