如何利用shell开发keepalived启动脚本

技术  /  管理员 发布于 7年前   366

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 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

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