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

    总结

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