Install heartbeat by entering the following commands in the terminal:
sudo apt update sudo apt install heartbeat
Description:
Subsystem for High-Availability Linux
heartbeat is a messaging subsystem for high availability which implements serial, UDP, and PPP/UDP heartbeats. . It is one of the messaging layers supported by the Pacemaker cluster resource manager.
Homepage: http://www.linux-ha.org/
Version: 1:3.0.6-7
Section: admin