How To Install drbdlinks on CentOS 8
Introduction
In this tutorial we learn how to install drbdlinks on CentOS 8.
What is drbdlinks
The drbdlinks program manages links into a DRBD partition which is shared among several machines. A simple configuration file, “/etc/drbdlinks.conf”, specifies the links. This can be used to manage e.g. links for /etc/httpd, /var/lib/pgsql and other system directories that need to appear as if they are local to the system when running applications after the drbd shared partition has been mounted. When running drbdlinks with “start” as the mode, drbdlinks will rename the existing files/directories and then make symbolic links into the DRBD partition, “stop” does the reverse. By default, rename appends “.drbdlinks” to the name, but this can be overridden. An init script is included which runs “stop” before heartbeat starts, and after heartbeat stops. This is done to try to ensure that when the shared partition isn’t mounted, the links are in their normal state.
We can use yum or dnf to install drbdlinks on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install drbdlinks.
Install drbdlinks 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 drbdlinks using dnf by running the following command:
sudo dnf -y install drbdlinks
Install drbdlinks 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 drbdlinks using yum by running the following command:
sudo yum -y install drbdlinks
How To Uninstall drbdlinks on CentOS 8
To uninstall only the drbdlinks package we can use the following command:
sudo dnf remove drbdlinks
drbdlinks Package Contents on CentOS 8
/etc/drbdlinks.conf
/etc/drbdlinks.d
/etc/ha.d
/etc/ha.d/resource.d
/etc/ha.d/resource.d/drbdlinks
/etc/logrotate.d/drbdlinks
/usr/lib/ocf/resource.d/tummy
/usr/lib/ocf/resource.d/tummy/drbdlinks
/usr/lib/systemd/system/drbdlinksclean.service
/usr/libexec/drbdlinksclean
/usr/sbin/drbdlinks
/usr/share/doc/drbdlinks
/usr/share/doc/drbdlinks/README
/usr/share/doc/drbdlinks/WHATSNEW
/usr/share/licenses/drbdlinks
/usr/share/licenses/drbdlinks/LICENSE
/usr/share/man/man8/drbdlinks.8.gz
/var/lib/drbdlinks
/var/lib/drbdlinks/configs-to-clean
References
Summary
In this tutorial we learn how to install drbdlinks on CentOS 8 using yum and dnf.