Index: head/net-mgmt/grok_exporter/Makefile
===================================================================
--- head/net-mgmt/grok_exporter/Makefile	(revision 466545)
+++ head/net-mgmt/grok_exporter/Makefile	(revision 466546)
@@ -1,39 +1,42 @@
 # $FreeBSD$
 
 PORTNAME=	grok_exporter
 PORTVERSION=	0.2.3
 DISTVERSIONPREFIX=v
+PORTREVISION=	1
 CATEGORIES=	net-mgmt
 
 MAINTAINER=	gasol.wu@gmail.com
 COMMENT=	Export Prometheus metrics from arbitrary unstructured log data
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 ONLY_FOR_ARCHS=	amd64
 
 LIB_DEPENDS=	libonig.so:devel/oniguruma
 
 USES=		go
 USE_GITHUB=	yes
 GH_ACCOUNT=	fstab logstash-plugins:plugins
 GH_PROJECT=	logstash-patterns-core:plugins
 GH_TAGNAME=	6d25c13:plugins
+USERS=		prometheus
+GROUPS=		prometheus
 
 GO_PKGNAME=	github.com/${GH_ACCOUNT}/${PORTNAME}
 USE_RC_SUBR=	grok_exporter
 SUB_FILES=	config.yml
 
 do-build:
 	${LN} -sf ${WRKSRC}/tailer/fileTailer_darwin.go ${WRKSRC}/tailer/fileTailer_freebsd.go
 	@(cd ${GO_WRKSRC}; ${SETENV} ${MAKE_ENV} ${GO_ENV} ${GO_CMD} build -o ${PORTNAME} .)
 
 do-install:
 	${INSTALL_PROGRAM} ${GO_WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 	${MKDIR} ${STAGEDIR}${ETCDIR}
 	${INSTALL_DATA} ${WRKDIR}/config.yml ${STAGEDIR}${ETCDIR}
 	@(cd ${WRKSRC} && ${COPYTREE_SHARE} example ${STAGEDIR}${DATADIR})
 	@(cd ${WRKSRC_plugins} && ${COPYTREE_SHARE} patterns ${STAGEDIR}${DATADIR})
 
 .include <bsd.port.mk>
Index: head/net-mgmt/grok_exporter/files/grok_exporter.in
===================================================================
--- head/net-mgmt/grok_exporter/files/grok_exporter.in	(revision 466545)
+++ head/net-mgmt/grok_exporter/files/grok_exporter.in	(revision 466546)
@@ -1,47 +1,49 @@
 #!/bin/sh
 # $FreeBSD$
 
 # PROVIDE: grok_exporter
 # REQUIRE: LOGIN
 # KEYWORD: shutdown
 #
 # Add the following lines to /etc/rc.conf.local or /etc/rc.conf
 # to enable this service:
 #
 # grok_exporter_enable (bool):            Set to NO by default.
 #               Set it to YES to enable grok_exporter.
 # grok_exporter_config (string):          Set path to config file
 #               Default is "%%ETCDIR%%/config.yml".
 # grok_exporter_user (string):            Set user that grok_exporter will run under
-#               Default is "nobody".
+#               Default is "prometheus".
 # grok_exporter_group (string):           Set group that grok_exporter will run under
-#               Default is "nobody".
+#               Default is "prometheus".
 
 . /etc/rc.subr
 
 name=grok_exporter
 desc="Grok prometheus exporter"
 rcvar=grok_exporter_enable
 
 load_rc_config $name
 
 : ${grok_exporter_enable:=NO}
 : ${grok_exporter_config:=%%ETCDIR%%/config.yml}
-: ${grok_exporter_user:=nobody}
-: ${grok_exporter_group:=nobody}
+: ${grok_exporter_user:=prometheus}
+: ${grok_exporter_group:=prometheus}
 
 pidfile=/var/run/grok_exporter.pid
 command=/usr/sbin/daemon
 procname=%%PREFIX%%/bin/grok_exporter
 command_args="-p ${pidfile} /usr/bin/env ${procname} -config ${grok_exporter_config}"
 
 start_precmd=grok_exporter_startprecmd
 
 grok_exporter_startprecmd()
 {
-    if [ ! -e ${pidfile} ]; then
+    if [ -e ${pidfile} ]; then
+        chown ${grok_exporter_user}:${grok_exporter_group} ${pidfile};
+    else
         install -o ${grok_exporter_user} -g ${grok_exporter_group} /dev/null ${pidfile};
     fi
 }
 
 run_rc_command "$1"