centos7安装MySQL后没有生成临时密码

在centos7安装MySQL后，/var/log/mysqld.log中没有生成临时密码

# rm -rf /var/lib/mysqld
# systemctl start mysqld
# grep 'temporary password' /var/log/mysqld.log
2019-01-07T10:38:33.469921Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: Qd0C9iersB+X

Qd0C9iersB+X 为临时密码