gpg --gen-key hangs at gaining enough entropy on CentOS 7

gpg --gen-key hangs at gaining enough entropy on CentOS 7

Solution 1:

Install random number generator:

# yum install rng-tools

# systemctl enable rngd

# systemctl restart rngd

Solution 2:

# dd if=/dev/sda of=/dev/zero

Reference:

https://serverfault.com/questions/471412/gpg-gen-key-hangs-at-gaining-enough-entropy-on-centos-6#