The haveged project is an attempt to provide an easy-to-use, unpredictable random number generator based upon an adaptation of the HAVEGE algorithm. Haveged was created to remedy low-entropy conditions in the Linux random device that can occur under some workloads, especially on headless servers.
List available entropy
If you're not sure, whether you need haveged, run:
# cat /proc/sys/kernel/random/entropy_avail
This command shows you how much entropy your server has collected. If it is rather low (<1000), you should probably install haveged. Otherwise cryptographic applications will block until there is enough entropy available, which eg. could result in slow wlan speed, if your server is a Software Access Point.
You should use this command again to verify how much haveged boosted your entropy pool after the installation.
Install the package as usually with pacman:
# pacman -S haveged
To start the service once, run:
# systemctl start haveged.service
You'll probably want it to run everytime your server boots up, so run:
# systemctl enable haveged.service