Vim  /etc/hosts

添加：

192.168.1.154 MASTER

192.168.1.142 BACKUP

# tar zxvf keepalived-1.2.18.tar.gz

# cd keepalived-1.2.18

# ./configure --PRefix=/usr/local/keepalived

# make

# make install

# mkdir /etc/sysconfig

# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

# cp /usr/local/keepalived/sbin/keepalived /sbin/

# mkdir /etc/keepalived

# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     sai@localhost # 報(bào)警郵件接收人的地址

   }

   notification_email_from root@localhost # 發(fā)送報(bào)警郵件發(fā)件人地址

   smtp_server 127.0.0.1# 發(fā)送郵件的服務(wù)器地址

   smtp_connect_timeout 30# 郵件超時(shí)時(shí)間(可以根據(jù)自己的需求進(jìn)行設(shè)定)

   router_id MASTERL # 一個(gè)實(shí)例的標(biāo)識地址(可以有多個(gè)實(shí)例但不能相同) BACKUP主機(jī)修改為BACKUP

}

vrrp_script monitor_tomcat {

  script “/root/scripts/monitor_tomcat.sh”#根據(jù)自己的實(shí)際路徑放置健康檢查腳本文件，這里寫的是tomcat的檢測腳本

  interval 1# 腳本執(zhí)行間隔

Weight -5#腳本結(jié)果導(dǎo)致的優(yōu)先級變更:5表示優(yōu)先級加5；-5表示優(yōu)先級減5

}

vrrp_instance VI_1 {# 虛擬路由器自己的名字

    state MASTER# 設(shè)置服務(wù)器模式，當(dāng)前為主節(jié)點(diǎn),master端

    interface eth0# 實(shí)例網(wǎng)卡,也就是提供服務(wù)的網(wǎng)卡，來發(fā)送vrrp通告

    virtual_router_id 51# 設(shè)置vrid,這里非常重要,相同的vrid為一個(gè)組,他決定,它將決定多播的MAC地址.（建議不要使用默認(rèn)地址,以免發(fā)生沖突）

    priority 100#  設(shè)置本節(jié)點(diǎn)的優(yōu)先級,優(yōu)先級高的為master BACKUP主機(jī)設(shè)置為95

    nopreempt #搶占方式實(shí)現(xiàn)當(dāng)優(yōu)先級高的調(diào)度節(jié)點(diǎn)故障恢復(fù)后，不再搶占為主調(diào)度服務(wù)器，從而也就避免了因調(diào)度節(jié)點(diǎn)的故障及故障恢復(fù)后來回切換的問題。

advert_int 1# 檢查間隔,默認(rèn)為1秒

    authentication {

        auth_type PASS# 認(rèn)證方式,可以是pass或者AH兩種認(rèn)證方式

        auth_pass 1111# 認(rèn)證密碼

    }

    virtual_ipaddress {# 設(shè)置vip,虛擬ip地址(實(shí)現(xiàn)高可用,轉(zhuǎn)移的vip地址)

        192.168.1.77# 此地址并不存在,當(dāng)成為主節(jié)點(diǎn)時(shí),此ip地址將會自動(dòng)生成

}

script_track {

monitor_tomcat  #跟蹤這個(gè)monitor_nginx腳本;就是不斷去檢查這個(gè)腳本

}

}

virtual_server localhost 8080 { 

        delay_loop 2   #每個(gè)2秒檢查一次real_server狀態(tài) 

        lb_algo wrr   #LVS算法 

        lb_kind DR    #LVS模式 

        persistence_timeout 60   #會話保持時(shí)間 

        protocol TCP 

        real_server localhost 8080 { 

        weight 3 

        notify_down  /root/scripts/monitor_tomcat.sh #檢測到服務(wù)down后執(zhí)行的腳本 

        TCP_CHECK { 

          connect_timeout 2    #連接超時(shí)時(shí)間 

          nb_get_retry 2       #重連次數(shù) 

          delay_before_retry 2   #重連間隔時(shí)間 

          connect_port 8080   #健康檢查端口 

        } 

        } 

        } 

1). apt-get install expect

2).編輯ssh交互腳本 vim /root/scripts/.vpn

#!/usr/bin/expect -f

set port 58081

set user root

set host BACKUP  #BACKUP主機(jī)中這里需要更改為MASTER

set passWord 4753beeba235268793abe399debb07fd

set timeout -1

set RES ""

spawn ssh $user@$host -p $port service keepalived stop

expect "*assword:*"

send "$password/r"

expect eof

!/bin/sh

$(wget --spider http://localhost:8080/ 2> conn.txt )

RC=$(cat conn.txt | grep 'Connection refused')

#本地主機(jī)8080服務(wù)down掉

if [[ $RC != "" ]];then

        rm conn.txt

        $(wget --spider http://BACKUP:8080/ 2> conn.txt )

        BACKUPRC=$(cat conn.txt | grep 'Connection refused')

        if [[ $BACKUPRC == "" ]];then

                #如果BACKUP主機(jī)8080服務(wù)正常 執(zhí)行expect腳本ssh遠(yuǎn)程登錄BACKUP主機(jī)>并啟動(dòng)keepalived

                rm conn.txt

                /root/scripts/.vpn

                #等待1s再殺掉本地的keepalived服務(wù)

                sleep 1

                service keepalived stop

                #嘗試啟動(dòng)本地8080服務(wù)

                service tomcat7 restart

        else

                #BACKUP主機(jī)8080服務(wù)down掉 嘗試重啟本地8080服務(wù) 失敗則殺掉keepalived服務(wù) 說明兩臺主機(jī)都down掉了

                rm conn.txt

                service tomcat7 restart

        else

                #BACKUP主機(jī)8080服務(wù)down掉 嘗試重啟本地8080服務(wù) 失敗則殺掉keepalived服務(wù) 說明兩臺主機(jī)都down掉了

                rm conn.txt

                service tomcat7 restart

                $(wget --spider http://localhost:8080/ 2> conn.txt )

                LOCALRC=$(cat conn.txt | grep 'Connection refused')

                if [[ $LOCALRC != "" ]];then

                        #重啟失敗 殺掉keepalived

                        service keepalived stop

                fi

        fi

else

        rm conn.txt

        echo "no Warning"

fi

#!/bin/sh

$(wget --spider http://BACKUP:8080/ 2> conn.txt )

RC=$(cat conn.txt | grep 'Connection refused')

#本地主機(jī)8080服務(wù)down掉

if [[ $RC != "" ]];then

        rm conn.txt

        $(wget --spider http://MASTER:8080/ 2> conn.txt )

        MASTERRC=$(cat conn.txt | grep 'Connection refused')

        if [[ $MASTERRC == "" ]];then

                #如果MASTER主機(jī)8080服務(wù)正常 執(zhí)行expect腳本ssh遠(yuǎn)程登錄MASTER主機(jī)>并啟動(dòng)keepalived

                rm conn.txt

                /root/scripts/.vpn

                #等待1s再殺掉本地的keepalived服務(wù)

                sleep 1

                service keepalived stop

                #嘗試啟動(dòng)本地8080服務(wù)

                service tomcat7 restart

        else

                #MASTER主機(jī)8080服務(wù)down掉 嘗試重啟本地8080服務(wù) 失敗則殺掉keepalived服務(wù) 說明兩臺主機(jī)都down掉了

                rm conn.txt

                service tomcat7 restart

                $(wget --spider http://localhost:8080/ 2> conn.txt )

                LOCALRC=$(cat conn.txt | grep 'Connection refused')

                if [[ $LOCALRC != "" ]];then

                        #重啟失敗 殺掉keepalived

                        service keepalived stop

                fi

                rm conn.txt

        fi

else

        rm conn.txt

        echo "no Warning"

fi

vim /etc/init.d/keepalived

start()

#daemon keepalived ${KEEPALIVED_OPTIONS}

/usr/local/keepalived/sbin/keepalived

stop()

#killproc keepalived

killall keepalived

reload()

#killproc keepalived -1

killall keepalived -1