How To Install haveged on CentOS 8
Introduction
In this tutorial we learn how to install haveged on CentOS 8.
What is haveged
A Linux entropy source using the HAVEGE algorithm Haveged is a user space entropy daemon which is not dependent upon the standard mechanisms for harvesting randomness for the system entropy pool. This is important in systems with high entropy needs or limited user interaction (e.g. headless servers). Haveged uses HAVEGE (HArdware Volatile Entropy Gathering and Expansion) to maintain a 1M pool of random bytes used to fill /dev/random whenever the supply of random bits in /dev/random falls below the low water mark of the device. The principle inputs to haveged are the sizes of the processor instruction and data caches used to setup the HAVEGE collector. The haveged default is a 4kb data cache and a 16kb instruction cache. On machines with a cpuid instruction, haveged will attempt to select appropriate values from internal tables.
We can use yum or dnf to install haveged on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install haveged.
Install haveged on CentOS 8 Using dnf
Update yum database with dnf using the following command.
sudo dnf makecache --refresh
The output should look something like this:
CentOS Linux 8 - AppStream 43 kB/s | 4.3 kB 00:00
CentOS Linux 8 - BaseOS 65 kB/s | 3.9 kB 00:00
CentOS Linux 8 - ContinuousRelease 43 kB/s | 3.0 kB 00:00
CentOS Linux 8 - Extras 23 kB/s | 1.5 kB 00:00
CentOS Linux 8 - FastTrack 40 kB/s | 3.0 kB 00:00
CentOS Linux 8 - HighAvailability 36 kB/s | 3.9 kB 00:00
CentOS Linux 8 - Plus 24 kB/s | 1.5 kB 00:00
CentOS Linux 8 - PowerTools 50 kB/s | 4.3 kB 00:00
Extra Packages for Enterprise Linux Modular 8 - x86_64 13 kB/s | 9.2 kB 00:00
Extra Packages for Enterprise Linux 8 - x86_64 24 kB/s | 8.5 kB 00:00
Metadata cache created.
After updating yum database, We can install haveged using dnf by running the following command:
sudo dnf -y install haveged
Install haveged on CentOS 8 Using yum
Update yum database with yum using the following command.
sudo yum makecache --refresh
The output should look something like this:
CentOS Linux 8 - AppStream 43 kB/s | 4.3 kB 00:00
CentOS Linux 8 - BaseOS 65 kB/s | 3.9 kB 00:00
CentOS Linux 8 - ContinuousRelease 43 kB/s | 3.0 kB 00:00
CentOS Linux 8 - Extras 23 kB/s | 1.5 kB 00:00
CentOS Linux 8 - FastTrack 40 kB/s | 3.0 kB 00:00
CentOS Linux 8 - HighAvailability 36 kB/s | 3.9 kB 00:00
CentOS Linux 8 - Plus 24 kB/s | 1.5 kB 00:00
CentOS Linux 8 - PowerTools 50 kB/s | 4.3 kB 00:00
Extra Packages for Enterprise Linux Modular 8 - x86_64 13 kB/s | 9.2 kB 00:00
Extra Packages for Enterprise Linux 8 - x86_64 24 kB/s | 8.5 kB 00:00
Metadata cache created.
After updating yum database, We can install haveged using yum by running the following command:
sudo yum -y install haveged
How To Uninstall haveged on CentOS 8
To uninstall only the haveged package we can use the following command:
sudo dnf remove haveged
haveged Package Contents on CentOS 8
/usr/lib/.build-id
/usr/lib/.build-id/a9
/usr/lib/.build-id/a9/930033f89d052af5321640eccfbf81b39051a7
/usr/lib/.build-id/dd
/usr/lib/.build-id/dd/dcc2734915a6567e105e283e85ee11df309429
/usr/lib/dracut/modules.d/98haveged
/usr/lib/dracut/modules.d/98haveged/module-setup.sh
/usr/lib/systemd/system/haveged-switch-root.service
/usr/lib/systemd/system/haveged.service
/usr/lib/udev/rules.d/90-haveged.rules
/usr/lib64/libhavege.so.2
/usr/lib64/libhavege.so.2.0.0
/usr/sbin/haveged
/usr/share/doc/haveged
/usr/share/doc/haveged/AUTHORS
/usr/share/doc/haveged/COPYING
/usr/share/doc/haveged/ChangeLog
/usr/share/doc/haveged/README
/usr/share/doc/haveged/havege_sample.c
/usr/share/man/man8/haveged.8.gz
References
Summary
In this tutorial we learn how to install haveged on CentOS 8 using yum and dnf.