(Optional) Haveged Service Startup

Check whether the haveged service is enabled in the system. (You are advised to keep the haveged service enabled.)
```
systemctl status haveged.service
```
or
```
ps -ef | grep "haveged" | grep -v "grep"
```
Start the haveged service and make it start with the system. Ensure that the haveged service is always started.
```
systemctl start haveged.service
systemctl enable haveged.service
```
Check the speed at which random numbers are displayed on the screen.
```
cat /dev/random | od -x
```
View the current entropy.
```
cat /proc/sys/kernel/random/entropy_avail
```
In normal cases, the entropy before haveged is started is over 100. After haveged is started, the entropy increases to more than 1,000 or even 2,000.

Parent topic: Preparing for Installation