查看当前系统的随机数生成速率

# watch -n 1 cat /proc/sys/kernel/random/entropy_avail

安装服务进行优化

# yum -y install rng-tools

# echo 'EXTRAOPTIONS="--rng-device /dev/urandom"' >/etc/sysconfig/rngd
# systemctl  start rngd
# systemctl  status rngd

rngd服务启动失败解决办法

# rngd -v
Unable to open file: /dev/tpm0
can't open any entropy source
Maybe RNG device modules are not loaded
# cp /usr/lib/systemd/system/rngd.service /etc/systemd/system/
# vim /etc/systemd/system/rngd.service 
[Unit]
Description=Hardware RNG Entropy Gatherer Daemon

[Service]
ExecStart=/sbin/rngd -f -r /dev/urandom //修改此处加上`-r /dev/urandom`

[Install]
WantedBy=multi-user.target

# systemctl  daemon-reload
# systemctl  restart rngd.service