How To Install unbound on CentOS 8
Introduction
In this tutorial we learn how to install unbound on CentOS 8.
What is unbound
Unbound is a validating, recursive, and caching DNS(SEC) resolver. The C implementation of Unbound is developed and maintained by NLnet Labs. It is based on ideas and algorithms taken from a java prototype developed by Verisign labs, Nominet, Kirei and ep.net. Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible.
We can use yum or dnf to install unbound on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install unbound.
Install unbound 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 unbound using dnf by running the following command:
sudo dnf -y install unbound
Install unbound 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 unbound using yum by running the following command:
sudo yum -y install unbound
How To Uninstall unbound on CentOS 8
To uninstall only the unbound package we can use the following command:
sudo dnf remove unbound
unbound Package Contents on CentOS 8
/etc/sysconfig/unbound
/etc/unbound/conf.d
/etc/unbound/conf.d/example.com.conf
/etc/unbound/keys.d
/etc/unbound/keys.d/example.com.key
/etc/unbound/local.d
/etc/unbound/local.d/block-example.com.conf
/etc/unbound/unbound.conf
/etc/unbound/unbound_control.key
/etc/unbound/unbound_control.pem
/etc/unbound/unbound_server.key
/etc/unbound/unbound_server.pem
/usr/lib/.build-id
/usr/lib/.build-id/77
/usr/lib/.build-id/77/37cca6c5543e9face2e6215e51a71291841a75
/usr/lib/.build-id/80
/usr/lib/.build-id/80/196979f32ea08c490698a6e0ae0e8c045f5fca
/usr/lib/.build-id/bb
/usr/lib/.build-id/bb/c80a8d6306c0d4a36538b081220437e7dbdfff
/usr/lib/.build-id/c0
/usr/lib/.build-id/c0/469ff2715899ecbebe44c56795ba4723172543
/usr/lib/.build-id/e1
/usr/lib/.build-id/e1/3ab1e88a90e487addc7e3c19a0b69db3fefb48
/usr/lib/systemd/system/unbound-keygen.service
/usr/lib/systemd/system/unbound.service
/usr/lib/tmpfiles.d/unbound.conf
/usr/sbin/unbound
/usr/sbin/unbound-checkconf
/usr/sbin/unbound-control
/usr/sbin/unbound-control-setup
/usr/sbin/unbound-host
/usr/sbin/unbound-streamtcp
/usr/share/doc/unbound
/usr/share/doc/unbound/CREDITS
/usr/share/doc/unbound/FEATURES
/usr/share/man/man1/unbound-host.1.gz
/usr/share/man/man1/unbound-streamtcp.1.gz
/usr/share/man/man5/unbound.conf.5.gz
/usr/share/man/man8/unbound-checkconf.8.gz
/usr/share/man/man8/unbound-control-setup.8.gz
/usr/share/man/man8/unbound-control.8.gz
/usr/share/man/man8/unbound.8.gz
/var/run/unbound
References
Summary
In this tutorial we learn how to install unbound on CentOS 8 using yum and dnf.