centos7.4下yum方式安装mysql8.0

安装环境为centos7.4
首先下载yum安装的镜像
wget https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm
安装
rpm -Uvh mysql80-community-release-el7-1.noarch.rpm
yum install -y mysql-community-server
开启服务
service mysqld start
找到初始密码
grep ‘temporary password’ /var/log/mysqld.log

2018-08-15T06:13:14.412800Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: HhNLwoTU/01q

最后面这个字符串就是初始密码

mysql -uroot -p
输入上面那个初始密码

修改密码，这里注意一下，密码强度是有要求的，这也是MYSQL8的特性
mysql>ALTER USER ‘root’@’localhost’ IDENTIFIED BY ‘MyNewPass4!’;
mysql>use mysql;
修改登录IP限制，不修改就只能本地登录
mysql>update user set host = ‘%’ where user = ‘root’;

重新刷新一下，因为有的时候用远程工具连接会有问题
mysql>ALTER USER ‘root’@’%’ IDENTIFIED BY ‘MyNewPass4!’ PASSWORD EXPIRE NEVER;
mysql>ALTER USER ‘root’@’%’ IDENTIFIED WITH mysql_native_password BY ‘MyNewPass4!’;

好了，用数据库的远程工具连接上可以用了

数据目录：/usr/lib/mysql
配置文件：/etc/my.cnf
日志：/var/log/mysqld.log
PID文件：/var/run/mysqld
sock：/var/lib/mysql/mysql.sock