如何利用shell开发keepalived启动脚本

keepalived是什么？

Keepalived软件起初是专为LVS负载均衡软件设计的，用来管理并监控LVS集群系统中各个服务节点的状态，后来又加入了可以实现高可用的VRRP功能。因此，Keepalived除了能够管理LVS软件外，还可以作为其他服务（例如：Nginx、Haproxy、Mysql等）的高可用解决方案软件。

　　Keepalived软件主要是通过VRRP协议实现高可用功能的。VRRP是Virtual Router RedundancyProtocol(虚拟路由器冗余协议）的缩写，VRRP出现的目的就是为了解决静态路由单点故障问题的，它能够保证当个别节点宕机时，整个网络可以不间断地运行。

　　所以，Keepalived 一方面具有配置管理LVS的功能，同时还具有对LVS下面节点进行健康检查的功能，另一方面也可实现系统网络服务的高可用功能。

         keepalived官网Http://www.keepalived.org

1.1 keepalived的相关的文件

keepalived的执行命令：/data/apps/keepalived/sbin/keepalived
keepalived的配置文件：/data/apps/keepalived/etc/keepalived/keepalived.conf
keepalived的Pid文件：/data/apps/keepalived/run/keepalived.pid

1.2 keepalived的启停止方式

注意：不要去修改/data/apps/keepalived/etc/sysconfig/keepalived文件

启动方式：keepalived -f 配置文件(绝对路径)  -p PID文件(绝对路径)
关闭方式：kill $( cat PID文件(绝对路径) )

1.3 脚本内容

注意：该脚本只能linux的超级用户root才能启动,因为脚本中有进行限制

#!/bin/bash
## Define variables
RETVAL=0
Conf="/data/apps/keepalived/etc/keepalived/keepalived.conf"
Exce="/data/apps/keepalived/sbin/keepalived"
Pid="/data/apps/keepalived/run/keepalived.pid"
# Determine the user to execute
if [ "$UID" -ne "$RETVAL" ];then
  echo "Must be root to run scripts"
  exit 1
fi
# Load local functions library
[ -f /etc/init.d/functions ] && source /etc/init.d/functions
# Define functions
start(){
 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 functions
case "$1" in
 start)
 start
 RETVAL=$?
 ;;
 stop)
 stop
 RETVAL=$?
 ;;
 status)
 status
 RETVAL=$?
 ;;
 restart)
 stop
 sleep 2
 start
 RETVAL=$?
 ;;
 *)
 echo "USAGE:$0{status|start|stop|restart}"
     exit 1 
esac
# Scripts return values
exit $RETVAL

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