The Linux pseudo random number generator (PRNG) is a special device that generates randomness from hardware interrupts (keyboard, mouse, disk/network I/O) and other operating system sources. This randomness is used mostly for encryption like SSL/TLS, but also has many other uses.
When this randomness is used up, you will encounter massive delays in the start and run time of flex.bi and other programs on your server, that's why we recommend using haveged.
To install Haveged on a Centos 8 OS, follow these instructions:
Add EPEL repository to your server following this instruction
Then install Haveged and start it:
sudo dnf install haveged systemctl enable haveged systemctl start havegedCODE
To test the amount of available entropy, you can run the following command: