yum install -y rng-tools
# cp /usr/lib/systemd/system/rngd.service /etc/systemd/system vi /usr/lib/systemd/system/rngd.service # ExecStart 항목 수정 ExecStart=/sbin/rngd -f -r /dev/urandom ### 확인 watch -n 1 cat /proc/sys/kernel/random/entropy_avail