keepalived是什么？
Keepalived軟件起初是專為LVS負載均衡軟件設計的，用來管理并監控LVS集群系統中各個服務節點的狀態，后來又加入了可以實現高可用的VRRP功能。因此，Keepalived除了能夠管理LVS軟件外，還可以作為其他服務（例如：Nginx、Haproxy、MySQL等）的高可用解決方案軟件。
Keepalived軟件主要是通過VRRP協議實現高可用功能的。VRRP是Virtual Router RedundancyProtocol(虛擬路由器冗余協議）的縮寫，VRRP出現的目的就是為了解決靜態路由單點故障問題的，它能夠保證當個別節點宕機時，整個網絡可以不間斷地運行。
所以，Keepalived 一方面具有配置管理LVS的功能，同時還具有對LVS下面節點進行健康檢查的功能，另一方面也可實現系統網絡服務的高可用功能。
keepalived官網http://www.keepalived.org
1.1 keepalived的相關的文件
keepalived的執行命令：/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的啟停止方式
注意：不要去修改/data/apps/keepalived/etc/sysconfig/keepalived文件
啟動方式：keepalived -f 配置文件(絕對路徑) -p PID文件(絕對路徑)
關閉方式：kill $( cat PID文件(絕對路徑) )
1.3 腳本內容
注意：該腳本只能Linux的超級用戶root才能啟動,因為腳本中有進行限制
#!/bin/bash
## Define variables
RETVAL=0
Conf="/data/apps/keepalived/etc/keepalived/keepalived.conf"
Exce="/data/apps/keepalived/sbin/keepalived"
Pid="/data/apps/keepalived/run/keepalived.pid"
# Determine the user to execute
if [ "$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
總結
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