I NEED HELP THIS THIS LINUX IN CENTOS OS, How do i dos this

rite a systemd service unit called heartbeat. The function of this service is to write a log message to /var/log/messages every ten seconds. Start this service.

When you run the command systemctl status heartbeat, you should see output similar to the following:

[root@localhost system]$ systemctl status heartbeat.service  heartbeat.service - heartbeat service Loaded: loaded (/etc/systemd/system/heartbeat.service; disabled; vendor preset: disabled) Active: active (running) since Mon 2018-01-08 21:15:14 EST; 1min 34s ago Main PID: 24626 (bash) CGroup: /system.slice/heartbeat.service 24626 /usr/bin/bash -c while sleep 10; do /usr/bin/logger Still alive...; done 27946 sleep 10 Jan 08 21:15:14 localhost.localdomain systemd[1]: Started heartbeat service. Jan 08 21:15:14 localhost.localdomain systemd[1]: Starting heartbeat service...