yum -y install rng-tools( 熵服务)
cp /usr/lib/systemd/system/rngd.service /etc/systemd/system
vim /etc/systemd/system/rngd.service
修改: ExecStart=/sbin/rngd -f -r /dev/urandom
重新载入服务: systemctl daemon-reload
重启服务: systemctl restart rngd