graylog-sidecar (is a lightweight configuration management system)

Graylog Sidecar is a lightweight configuration management system for 
different log collectors, also called Backends. The Graylog node(s)
acts as a centralized hub containing the configurations of log
collectors. On supported message-producing devices/hosts, Sidecar
can run as a service (Windows host) or daemon (Linux host).

https://go2docs.graylog.org/5-0/getting_in_log_data/graylog_sidecar.html

Add this to /etc/rc.d/rc.local:
if [ -x /etc/rc.d/rc.graylog-sidecar ]; then
   /etc/rc.d/rc.graylog-sidecar start
fi

Add this to /etc/rc.d/rc.local_shutdown
if [ -x /etc/rc.d/rc.graylog-sidecar ]; then
   /etc/rc.d/rc.graylog-sidecar stop
fi