Centos7 Yum安装MYSQL8.0详细安装步骤
### 0、更换yum源
1、打开 mirrors.aliyun.com，选择centos的系统，点击帮助
2、执行命令：yum install wget -y
3、改变某些文件的名称
```
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
```
4、执行更换yum源的命令
```
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
```
5、更新本地缓存
yum clean all
yum makecache
### 1、查看系统中是否自带安装mysql
```shell
yum list installed | grep mysql
```
### 2、删除系统自带的mysql及其依赖（防止冲突）
```shell
yum -y remove mysql-libs.x86_64
```
### 3、安装wget命令
```
yum install wget -y
```
### 4、给CentOS添加rpm源，并且选择较新的源
```
wget -i -c https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
```
### 5、安装下载好的rpm文件
```
yum install mysql80-community-release-el7-3.noarch.rpm -y
```
### 6、使用yum安装mysql
```
yum install mysql-community-server -y
```
### 7、启动mysql服务
#启动mysql服务，查看启动状态及是否开机启动
```
systemctl start mysqld.service
systemctl status mysqld.service
systemctl list-unit-files | grep enabled
```
### 8、获取mysql的临时密码
```shell
grep "password" /var/log/mysqld.log
```
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### 9、使用临时密码登录
```shell
mysql -uroot -p
#输入密码
```
### 10、修改密码
```sql
#密码要符合mysql安全规则，否则修改不成功
ALTER USER 'root'@'localhost' IDENTIFIED BY '密码';
```
### 11、修改远程访问权限
```sql
grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
flush privileges;
```
### 12、设置字符集为utf-8
```shell
#在[mysqld]部分添加：
character-set-server=utf8
#在文件末尾新增[client]段，并在[client]段添加：
default-character-set=utf8
