如何利用shell开发keepalived启动脚本

#!/bin/bash## Define variablesRETVAL=0Conf="/data/apps/keepalived/etc/keepalived/keepalived.conf"Exce="/data/apps/keepalived/sbin/keepalived"Pid="/data/apps/keepalived/run/keepalived.pid"# Determine the user to executeif [ "$UID" -ne "$RETVAL" ];then echo "Must be root to run scripts" exit 1fi# Load local functions library[ -f /etc/init.d/functions ] && source /etc/init.d/functions# Define functionsstart(){ if [ ! -f "$Pid" ];then $Exce -f $Conf -p $Pid >/dev/null 2>&1 RETVAL=$? if [ $RETVAL -eq 0 ];then  action "Start keepalived service" /bin/true    else  action "Start keepalived service" /bin/false fi else echo "keepalived service is running" fi return $RETVAL}stop(){ if [ -f "$Pid" ];then   kill $(cat $Pid) >/dev/null 2>&1 RETVAL=$? if [ $RETVAL -eq 0 ];then  action "Stop keepalived service" /bin/true    else  action "Stop keepalived service" /bin/false fi else echo "keepalived service is not running" fi return $RETVAL}status(){ if [ -f "$Pid" ];then   echo "keepalived service is running" else echo "keepalived service is not running" fi return $RETVAL}# case local functionscase "$1" in start) start RETVAL=$? ;; stop) stop RETVAL=$? ;; status) status RETVAL=$? ;; restart) stop sleep 2 start RETVAL=$? ;; *) echo "USAGE:$0{status|start|stop|restart}"   exit 1 esac# Scripts return valuesexit $RETVAL