How To Install systemd-timesyncd on CentOS 8
Introduction
In this tutorial we learn how to install systemd-timesyncd on CentOS 8.
What is systemd-timesyncd
systemd-timesyncd is a system service to synchronize the local system clock with a remote Network Time Protocol server. It specifically implements only SNTP; this minimalistic service will set the system clock for large offsets or slowly adjust it for smaller deltas.
We can use yum or dnf to install systemd-timesyncd on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install systemd-timesyncd.
Install systemd-timesyncd 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 systemd-timesyncd using dnf by running the following command:
sudo dnf -y install systemd-timesyncd
Install systemd-timesyncd 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 systemd-timesyncd using yum by running the following command:
sudo yum -y install systemd-timesyncd
How To Uninstall systemd-timesyncd on CentOS 8
To uninstall only the systemd-timesyncd package we can use the following command:
sudo dnf remove systemd-timesyncd
systemd-timesyncd Package Contents on CentOS 8
/etc/systemd/timesyncd.conf
/usr/lib/.build-id
/usr/lib/.build-id/4e
/usr/lib/.build-id/4e/44b684771c054b3b4955ee129a04e93f59994a
/usr/lib/.build-id/83
/usr/lib/.build-id/83/0dc86f33dcbe41121a8571e267e3642dd67e9a
/usr/lib/systemd/ntp-units.d
/usr/lib/systemd/ntp-units.d/80-systemd-timesync.list
/usr/lib/systemd/system/systemd-time-wait-sync.service
/usr/lib/systemd/system/systemd-timesyncd.service
/usr/lib/systemd/system/systemd-tmpfiles-clean.service.d
/usr/lib/systemd/system/systemd-tmpfiles-clean.service.d/10-time-set.conf
/usr/lib/systemd/system/time-set.target
/usr/lib/systemd/system/time-sync.target.d
/usr/lib/systemd/system/time-sync.target.d/10-time-set.conf
/usr/lib/systemd/systemd-time-wait-sync
/usr/lib/systemd/systemd-timesyncd
/usr/share/dbus-1/system-services/org.freedesktop.timesync1.service
/usr/share/dbus-1/system.d/org.freedesktop.timesync1.conf
/usr/share/licenses/systemd-timesyncd
/usr/share/licenses/systemd-timesyncd/LICENSE.LGPL2.1
/usr/share/man/man5/timesyncd.conf.5.gz
/usr/share/man/man5/timesyncd.conf.d.5.gz
/usr/share/man/man8/systemd-time-wait-sync.8.gz
/usr/share/man/man8/systemd-time-wait-sync.service.8.gz
/usr/share/man/man8/systemd-timesyncd.8.gz
/usr/share/man/man8/systemd-timesyncd.service.8.gz
/var/lib/systemd/timesync
/var/lib/systemd/timesync/clock
References
Summary
In this tutorial we learn how to install systemd-timesyncd on CentOS 8 using yum and dnf.