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# CentOS8 安装 MySQL8.0RPM
[作者博客](https://blog.51cto.com/u_11261718) [原文地址](https://blog.51cto.com/u_11261718/2465227)
> 环境:Linux centos8 4.18.0-80.el8.x86_64、Mysql8.0.18
## 1、Mysql官网下载RPM包
![CentOS8 安装 MySQL8.0RPM_linux](https://cdn.learnku.com/uploads/images/201912/21/32495/2TNOZ7kvVK.png!large)
![CentOS8 安装 MySQL8.0RPM_mysql_02](https://cdn.learnku.com/uploads/images/201912/21/32495/Dx4o27N0Ll.png!large)
## 2、检查是否安装过
```html
rpm -qa | grep -i mysql
```
## 3、卸载之前的安装
```html
rpm -e --nodeps 软件名 //强力删除,对相关依赖的文件也进行强力删除
```
## 4、安装客户端(mysql-client
```html
rpm -ivh rpm包
* 安装mysql-community-common-8.0.18
* 安装mysql-community-libs-8.0.18
* 安装mysql-community-client-8.0.18(前两个是其依赖)
```
![CentOS8 安装 MySQL8.0RPM_mysql_03](https://cdn.learnku.com/uploads/images/201912/21/32495/jO9Z6eEuME.png!large)
![CentOS8 安装 MySQL8.0RPM_mysql_04](https://cdn.learnku.com/uploads/images/201912/21/32495/nvlaQ3ER3H.png!large)
![CentOS8 安装 MySQL8.0RPM_mysql_05](https://cdn.learnku.com/uploads/images/201912/21/32495/dzHM5ERPtc.png!large)
## 5、安装服务端(mysql-server
![CentOS8 安装 MySQL8.0RPM_linux_06](https://cdn.learnku.com/uploads/images/201912/21/32495/Jtq8ljgSZ2.png!large)
![CentOS8 安装 MySQL8.0RPM_linux_07](https://cdn.learnku.com/uploads/images/201912/21/32495/6rIYWqftHM.png!large)
## 6、查看是否安装成功
```html
有以下方式查看:
* ps -ef | grep mysql
* cat /etc/group | grep mysql
* cat /etc/password | grep mysql
* mysqladmin --version
...
```
![CentOS8 安装 MySQL8.0RPM_mysql_08](https://cdn.learnku.com/uploads/images/201912/21/32495/aEIQJoMWwS.png!large)
![CentOS8 安装 MySQL8.0RPM_mysql_09](https://cdn.learnku.com/uploads/images/201912/21/32495/zwDTan2oHb.png!large)
![CentOS8 安装 MySQL8.0RPM_mysql_10](https://cdn.learnku.com/uploads/images/201912/21/32495/9bee6xP8Gr.png!large)
## 7、初始化mysql
```html
mysqld --initialize //创建数据文件目录和mysql系统数据库 产生随机root密码
```
## 8、启动mysql服务
```html
systemctl start mysqld
```
![CentOS8 安装 MySQL8.0RPM_linux_11](https://cdn.learnku.com/uploads/images/201912/21/32495/V4NWWzkibu.png!large)
```html
启动失败,因为/var/lib/mysql目录权限不够
```
![CentOS8 安装 MySQL8.0RPM_mysql_12](https://cdn.learnku.com/uploads/images/201912/21/32495/IJ2fjGgagY.png!large)
## 9、/var/lib/mysql目录权限授权
```html
chown -R mysql:mysql /var/lib/mysql/
```
![CentOS8 安装 MySQL8.0RPM_mysql_13](https://cdn.learnku.com/uploads/images/201912/21/32495/Zt9K5iXW3S.png!large)
## 10、启动mysql服务
```html
systemctl start mysqld //启动
ps -ef | grep mysql //查看mysql服务
```
![CentOS8 安装 MySQL8.0RPM_mysql_14](https://cdn.learnku.com/uploads/images/201912/21/32495/sEFjMpxsAi.png!large)
## 11、查看初始化随机生成的root密码
```html
cat /var/log/mysqld.log | grep password
```
![CentOS8 安装 MySQL8.0RPM_linux_15](https://cdn.learnku.com/uploads/images/201912/21/32495/hvgBsYLCbs.png!large)
## 12、安全设置
```html
mysql_secure_installation
```
![CentOS8 安装 MySQL8.0RPM_linux_16](https://cdn.learnku.com/uploads/images/201912/21/32495/LjRTaqHLuG.png!large)
![CentOS8 安装 MySQL8.0RPM_mysql_17](https://cdn.learnku.com/uploads/images/201912/21/32495/XIiZ6Cifxi.png!large)
## 13、mysql登录
```html
mysql -uroot -p //随机密码登录
```
![CentOS8 安装 MySQL8.0RPM_linux_18](https://cdn.learnku.com/uploads/images/201912/21/32495/Q9wTS3ocCT.png!large)
## 14、重置密码(Mysql8.0+有变化)
```html
先把root的旧密码置空
use mysql;
update user set authentication_string='' where user='root';
备注:Mysql5.7+ password字段 已改成 authentication_string字段
```
![CentOS8 安装 MySQL8.0RPM_mysql_19](https://cdn.learnku.com/uploads/images/201912/21/32495/hTmWm4KY6g.png!large)
```html
重置成新密码
alter user 'root'@'localhost' identified by 'newpassword';
备注:Mysql8.0修改密码方式已有变化(此处是个坑,需要注意)
Mysql8.0之前:
update user set password=password('root') where user='root';
```
![CentOS8 安装 MySQL8.0RPM_mysql_20](https://cdn.learnku.com/uploads/images/201912/21/32495/TlnCt0b6CK.png!large)
## 15、退出后使用新密码再登录mysql
```html
mysql -uroot -proot
```
![CentOS8 安装 MySQL8.0RPM_mysql_21](https://cdn.learnku.com/uploads/images/201912/21/32495/GsubKaox9h.png!large)
## 16、如何停止、重启和查看mysql服务
```html
systemctl stop mysqld //停止服务
systemctl restart mysqld //重启服务
systemctl status mysqld //查看服务
```
## 17、mysql的相关安装目录文件
```html
/usr/bin //相关命令
```
![CentOS8 安装 MySQL8.0RPM_linux_22](https://cdn.learnku.com/uploads/images/201912/21/32495/rzdrV1NbjT.png!large)
```html
/usr/share/mysql //配置文件目录
```
![CentOS8 安装 MySQL8.0RPM_mysql_23](https://cdn.learnku.com/uploads/images/201912/21/32495/bRGS2J2pnT.png!large)
```html
/var/lib/mysql //数据库文件存放目录
```
![CentOS8 安装 MySQL8.0RPM_mysql_24](https://cdn.learnku.com/uploads/images/201912/21/32495/wQYYNnmAeJ.png!large)
```html
/etc/my.cnf //mysql的启动配置文件
```
![CentOS8 安装 MySQL8.0RPM_mysql_25](https://cdn.learnku.com/uploads/images/201912/21/32495/avhSyrSOim.png!large)
## 18、后记
```html
my.ini //windows操作系统下的配置文件
my.cnf //linux操作系统下的配置文件
mysqld //是后台守护进程,即mysql daemon
mysql //是客户端命令行
```