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

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

总结

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