下载链接
https://dev.mysql.com/downloads/mysql/
确认linux对应的版本：
cat /proc/version
uname -a
lsb_release -a
cat /etc/redhat-release
cat 电脑/etc/issue
这个是内核的版本：
3.10.0-1062.9.1.el7.x86_64
选择操作系统版本:
tar -xvf mysql-8.0.20-1.el7.x86_64.rpm-bundle.tar
运行上述命令，得到如下结果，有8个文件包：
也可以创建一个文件夹，在同一个子目录下解压。
3.安装解压的rpm安装包然后我们可以用rpm -ivh命令来进行安装，注意安装顺序，因为这些包的安装是相互依赖的：
必须安装(注意顺序)rpm -ivh mysql-community-common-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-compat-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-embedded-compat-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-test-8.0.20-1.el7.x86_64.电脑rpm
安装过程中可能会报以下错误：出现问题：error:
Failed dependencies:
libnuma.so.1()(64bit) is needed by mysql-community-server-8.0.13-1.el7.x86_64 libnuma.so.1(libnuma_1.1)(64bit) is needed by mysql-community-server-8.0.13-1.el7.x86_64 libnuma.so.1(libnuma_1.2)(64bit) is needed by mysql-community-server-8.0.13-1.el7.x86_64
解决办法：
yum install numactl
出现问题：error:
Failed dependencies:pkgconfig(openssl) is needed by mysql-community-devel-8.0.13-1.el7.x86_64
解决办法：
yum install openssl-devel.x86_64 openssl.x86_64 -y
出现问题：error:
Failed dependencies:perl(Data::Dumper) is needed by mysql-community-test-8.0.13-1.el7.x86_64
解决办法：
yum -y install autoconf
出现问题：error:
Failed dependencies:perl(JSON) is needed by mysql-community-test-8.0.13-1.el7.x86_64
解决办法：
yum install perl.x86_64 perl-devel.x86_64 -y
yum install perl-JSON.noarch -y
出现问题：error:
error: Failed dependencies:libaio.so.1()(64bit) is needed by MySQL-server-5.5.25a-1.rhel5.x86_64libaio.so.1电脑(LIBAIO_0.1)(64bit) is needed by MySQL-server-5.5.25a-1.rhel5.x86_64
libaio.so.1(LIBAIO_0.4)(64bit) is needed by MySQL-server-5.5.25a-1.rhel5.x86_64
解决办法：
yum install libaio
以上我们的MySQL就安装好了，下面可以直接使用了。
4.使用数据库初始化数据库mysqld --initialize --console
目录授权，不授权的话MySQL没有写入权限，会启动失败所以在初始化之前，记得授权，命令为：chown -R mysql:mysql /var/lib/mysql/
启动msyql服务命令：systemctl start mysqld
停止MySQL命令：service mysqld stop
查看msyql服务的状态service mysqld status
当看到Active后面是active(runing)说明启动成功了
4.修改数据库密码当我们输入mysql -u root -p需要输入密码，我们可以去mysqld.log里面查看一下临时密码：
cat /var/log/mysqld.log
下面我们就可以使用你的临时密码登录数据库画线的部分就是安装好生成的初始密码
mysql -u root -p+回车
输入临时密码
修改命令：alter USER 'root'@'localhost' IDENTIFIED BY '新密码(必须包含：数字大小写字母特殊字符，长度最小为8位)';
后面一定要加分号，不然无效
然后ctrl+d退出，重新进入就可以了，
输入命令
show databases;
use mysql;
正常就可以了
电脑 电脑