Add reload command to systemd service file.
@@ -15,6 +15,7 @@ PIDFile=@piddir@/nrpe.pid
RuntimeDirectory=nrpe
RuntimeDirectoryMode=0755
ExecStart=@sbindir@/nrpe -c @pkgsysconfdir@/nrpe.cfg -f
+ExecReload=/bin/kill -HUP $MAINPID
ExecStopPost=/bin/rm -f @piddir@/nrpe.pid
TimeoutStopSec=60
User=@nrpe_user@